I've been looking on the internet for regenerative radio plans, but
haven't found any I like. I was hoping someone here could help. I
want to build from scratch, no kits. I would prefer one with 1 or 2
tubes, preferably octal based or earlier, but miniature acceptable. B+
is to be no more than 45 volts, which is the usual from what I've
seen. I also don't want one that requires litz wire for the coils,
pretty much impossible to get for me.


Thanks for your help.

Dave

On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
> I've been looking on the internet for regenerative radio plans, but
> haven't found any I like. I was hoping someone here could help. I
> want to build from scratch, no kits. I would prefer one with 1 or 2
> tubes, preferably octal based or earlier, but miniature acceptable. B+
> is to be no more than 45 volts, which is the usual from what I've
> seen. I also don't want one that requires litz wire for the coils,
> pretty much impossible to get for me.
>
> Thanks for your help.
>
> Dave

I found a circuit I really like, the only problem is it uses litz
wire, but I can't see no reason why regular coil wire wouldn't work.
It has an "RFC" I used to know what this was, I seem to have
forgotten. I still remember that dse had one that was about 1 mH, will
this work instead of the 2.5 mH? Also what type pot should I use,
linear, or audio for the regen control?

On Mar 13, 6:58 pm, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
>
> > I've been looking on the internet for regenerative radio plans, but
> > haven't found any I like. I was hoping someone here could help. I
> > want to build from scratch, no kits. I would prefer one with 1 or 2
> > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > is to be no more than 45 volts, which is the usual from what I've
> > seen. I also don't want one that requires litz wire for the coils,
> > pretty much impossible to get for me.
>
> > Thanks for your help.
>
> > Dave
>
> I found a circuit I really like, the only problem is it uses litz
> wire, but I can't see no reason why regular coil wire wouldn't work.
> It has an "RFC" I used to know what this was, I seem to have
> forgotten. I still remember that dse had one that was about 1 mH, will
> this work instead of the 2.5 mH? Also what type pot should I use,
> linear, or audio for the regen control?

Forgot the link: http://www.schmarder.com/radios/tube/2-1t4.htm

On Mar 13, 6:58 pm, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
>
> > I've been looking on the internet for regenerative radio plans, but
> > haven't found any I like. I was hoping someone here could help. I
> > want to build from scratch, no kits. I would prefer one with 1 or 2
> > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > is to be no more than 45 volts, which is the usual from what I've
> > seen. I also don't want one that requires litz wire for the coils,
> > pretty much impossible to get for me.
>
> > Thanks for your help.
>
> > Dave
>
> I found a circuit I really like, the only problem is it uses litz
> wire, but I can't see no reason why regular coil wire wouldn't work.
> It has an "RFC" I used to know what this was, I seem to have
> forgotten. I still remember that dse had one that was about 1 mH, will
> this work instead of the 2.5 mH? Also what type pot should I use,
> linear, or audio for the regen control?

Just done a bit of research on what RFC is, thanks to good ol'
Wikipedia I now know it means radio frequency choke, and the one at
Dick Smith is indeed 1 mH, wondering if that will do, if not how hard
would it be to wind my own?

"Dave.H" <the1930s@googlemail.com> wrote in message
news:03c9e2bb-45cb-4c85-96c5-72e0a6bdc1a1@e10g2000prf.googlegroups.com...
> On Mar 13, 6:58 pm, "Dave.H" <the19...@googlemail.com> wrote:
>> On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
>>
>> > I've been looking on the internet for regenerative radio plans, but
>> > haven't found any I like. I was hoping someone here could help. I
>> > want to build from scratch, no kits. I would prefer one with 1 or 2
>> > tubes, preferably octal based or earlier, but miniature acceptable. B+
>> > is to be no more than 45 volts, which is the usual from what I've
>> > seen. I also don't want one that requires litz wire for the coils,
>> > pretty much impossible to get for me.
>>
>> > Thanks for your help.
>>
>> > Dave
>>
>> I found a circuit I really like, the only problem is it uses litz
>> wire, but I can't see no reason why regular coil wire wouldn't work.
>> It has an "RFC" I used to know what this was, I seem to have
>> forgotten. I still remember that dse had one that was about 1 mH, will
>> this work instead of the 2.5 mH? Also what type pot should I use,
>> linear, or audio for the regen control?
>
> Just done a bit of research on what RFC is, thanks to good ol'
> Wikipedia I now know it means radio frequency choke, and the one at
> Dick Smith is indeed 1 mH, wondering if that will do, if not how hard
> would it be to wind my own?

Hmmm, ya seem to be talkin' to yaself here Dave.

--
Cheers ............. Rheilly

<snip>
>Just done a bit of research on what RFC is, thanks to good ol'
>Wikipedia I now know it means radio frequency choke, and the one at
>Dick Smith is indeed 1 mH, wondering if that will do, if not how hard
>would it be to wind my own?

I'll bet you can find a 2.5mHy if look hard enough. If not, how about putting
2 - 1mHy is series? That'd probably be close enough.
It wouldn't be hard, but to wind your own would require the ability to measure
your results.
I don't know that it make that much difference, but I would be more concerned
about the reduced Q of the coils resulting from not using litz wire.

Mike


"In view of such harmony in the cosmos which I,
with my limited human mind, am able to recognize,
there are yet people who say there is no God.
But what really makes me angry is that they quote
me for the support of such views."
Albert Einstein (theoretical Physicist)

On Mar 14, 12:46 am, "Rheilly Phoull" <rhei...@bigpong.com> wrote:
> "Dave.H" <the19...@googlemail.com> wrote in message
>
> news:03c9e2bb-45cb-4c85-96c5-72e0a6bdc1a1@e10g2000prf.googlegroups.com...
>
>
>
> > On Mar 13, 6:58 pm, "Dave.H" <the19...@googlemail.com> wrote:
> >> On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
>
> >> > I've been looking on the internet for regenerative radio plans, but
> >> > haven't found any I like. I was hoping someone here could help. I
> >> > want to build from scratch, no kits. I would prefer one with 1 or 2
> >> > tubes, preferably octal based or earlier, but miniature acceptable. B+
> >> > is to be no more than 45 volts, which is the usual from what I've
> >> > seen. I also don't want one that requires litz wire for the coils,
> >> > pretty much impossible to get for me.
>
> >> > Thanks for your help.
>
> >> > Dave
>
> >> I found a circuit I really like, the only problem is it uses litz
> >> wire, but I can't see no reason why regular coil wire wouldn't work.
> >> It has an "RFC" I used to know what this was, I seem to have
> >> forgotten. I still remember that dse had one that was about 1 mH, will
> >> this work instead of the 2.5 mH? Also what type pot should I use,
> >> linear, or audio for the regen control?
>
> > Just done a bit of research on what RFC is, thanks to good ol'
> > Wikipedia I now know it means radio frequency choke, and the one at
> > Dick Smith is indeed 1 mH, wondering if that will do, if not how hard
> > would it be to wind my own?
>
> Hmmm, ya seem to be talkin' to yaself here Dave.
>
> --
> Cheers ............. Rheilly

Yeah, I know

On Mar 13, 3:43=A0am, "Dave.H" <the19...@googlemail.com> wrote:
> I've been looking on the internet for regenerative radio plans, but
> haven't found any I like. =A0I was hoping someone here could help. =A0I
> want to build from scratch, no kits. I would prefer one with 1 or 2
> tubes, preferably octal based or earlier, but miniature acceptable. B+
> is to be no more than 45 volts, which is the usual from what I've
> seen. I also don't want one that requires litz wire for the coils,
> pretty much impossible to get for me.

There should be a fair number of designs on the web, just google
away. What frequencies are you trying to receive? What don't you
like about the ones you've found? The most common layout in the past
would probably be a detector followed by a stage of audio
amplification, e.g. a 6SJ7 driving a 6C5 (both octals), or one section
of a 6SL7 or 6SN7 driving the other section.

You shouldn't need litz wire - I believe that's only beneficial for
frequencies below the BC band. Just use magnet wire.

Mike

On Mar 14, 12:59 am, Mike Silva <snarflem...@yahoo.com> wrote:
> On Mar 13, 3:43 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > I've been looking on the internet for regenerative radio plans, but
> > haven't found any I like. I was hoping someone here could help. I
> > want to build from scratch, no kits. I would prefer one with 1 or 2
> > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > is to be no more than 45 volts, which is the usual from what I've
> > seen. I also don't want one that requires litz wire for the coils,
> > pretty much impossible to get for me.
>
> There should be a fair number of designs on the web, just google
> away. What frequencies are you trying to receive? What don't you
> like about the ones you've found? The most common layout in the past
> would probably be a detector followed by a stage of audio
> amplification, e.g. a 6SJ7 driving a 6C5 (both octals), or one section
> of a 6SL7 or 6SN7 driving the other section.
>
> You shouldn't need litz wire - I believe that's only beneficial for
> frequencies below the BC band. Just use magnet wire.
>
> Mike

The only band I'm interested in receiving is the AM band. Most of the
circuits I've seen on the web usually have at least one part I can't
seem to find. I can probably buy litz wire from Dave Schmarder (the
webmaster of the site I linked to) if I really really need it.

On Mar 13, 10:06=A0am, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 14, 12:59 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
>
>
>
>
> > On Mar 13, 3:43 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > I've been looking on the internet for regenerative radio plans, but
> > > haven't found any I like. =A0I was hoping someone here could help. =A0=
I
> > > want to build from scratch, no kits. I would prefer one with 1 or 2
> > > tubes, preferably octal based or earlier, but miniature acceptable. B+=

> > > is to be no more than 45 volts, which is the usual from what I've
> > > seen. I also don't want one that requires litz wire for the coils,
> > > pretty much impossible to get for me.
>
> > There should be a fair number of designs on the web, just google
> > away. =A0What frequencies are you trying to receive? =A0What don't you
> > like about the ones you've found? =A0The most common layout in the past
> > would probably be a detector followed by a stage of audio
> > amplification, e.g. a 6SJ7 driving a 6C5 (both octals), or one section
> > of a 6SL7 or 6SN7 driving the other section.
>
> > You shouldn't need litz wire - I believe that's only beneficial for
> > frequencies below the BC band. =A0Just use magnet wire.
>
> > Mike
>
> The only band I'm interested in receiving is the AM band. =A0Most of the
> circuits I've seen on the web usually have at least one part I can't
> seem to find. I can probably buy litz wire from Dave Schmarder (the
> webmaster of the site I linked to) if I really really need it.- Hide quote=
d text -
>
> - Show quoted text -

I highly doubt you need litz wire for the AM band. In fact, too high
a Q at such relatively low frequencies will reduce your bandwidth to
the point where you'll lose the few highs that an AM signal contains.
So don't worry about it.

Make sure you can adjust the coupling between your antenna and the
detector. You'll need very loose coupling to prevent any strong
stations from pulling or otherwise overloading the detector.

Mike

On Mar 14, 1:34 am, Mike Silva <snarflem...@yahoo.com> wrote:
> On Mar 13, 10:06 am, "Dave.H" <the19...@googlemail.com> wrote:
>
>
>
> > On Mar 14, 12:59 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
> > > On Mar 13, 3:43 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > > I've been looking on the internet for regenerative radio plans, but
> > > > haven't found any I like. I was hoping someone here could help. I
> > > > want to build from scratch, no kits. I would prefer one with 1 or 2
> > > > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > > > is to be no more than 45 volts, which is the usual from what I've
> > > > seen. I also don't want one that requires litz wire for the coils,
> > > > pretty much impossible to get for me.
>
> > > There should be a fair number of designs on the web, just google
> > > away. What frequencies are you trying to receive? What don't you
> > > like about the ones you've found? The most common layout in the past
> > > would probably be a detector followed by a stage of audio
> > > amplification, e.g. a 6SJ7 driving a 6C5 (both octals), or one section
> > > of a 6SL7 or 6SN7 driving the other section.
>
> > > You shouldn't need litz wire - I believe that's only beneficial for
> > > frequencies below the BC band. Just use magnet wire.
>
> > > Mike
>
> > The only band I'm interested in receiving is the AM band. Most of the
> > circuits I've seen on the web usually have at least one part I can't
> > seem to find. I can probably buy litz wire from Dave Schmarder (the
> > webmaster of the site I linked to) if I really really need it.- Hide quoted text -
>
> > - Show quoted text -
>
> I highly doubt you need litz wire for the AM band. In fact, too high
> a Q at such relatively low frequencies will reduce your bandwidth to
> the point where you'll lose the few highs that an AM signal contains.
> So don't worry about it.
>
> Make sure you can adjust the coupling between your antenna and the
> detector. You'll need very loose coupling to prevent any strong
> stations from pulling or otherwise overloading the detector.
>
> Mike

I know this is a stupid question, but what is coupling? Also, what
size coil wire do I need?

On Mar 14, 1:39 am, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 14, 1:34 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
>
>
> > On Mar 13, 10:06 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > On Mar 14, 12:59 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
> > > > On Mar 13, 3:43 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > > > I've been looking on the internet for regenerative radio plans, but
> > > > > haven't found any I like. I was hoping someone here could help. I
> > > > > want to build from scratch, no kits. I would prefer one with 1 or 2
> > > > > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > > > > is to be no more than 45 volts, which is the usual from what I've
> > > > > seen. I also don't want one that requires litz wire for the coils,
> > > > > pretty much impossible to get for me.
>
> > > > There should be a fair number of designs on the web, just google
> > > > away. What frequencies are you trying to receive? What don't you
> > > > like about the ones you've found? The most common layout in the past
> > > > would probably be a detector followed by a stage of audio
> > > > amplification, e.g. a 6SJ7 driving a 6C5 (both octals), or one section
> > > > of a 6SL7 or 6SN7 driving the other section.
>
> > > > You shouldn't need litz wire - I believe that's only beneficial for
> > > > frequencies below the BC band. Just use magnet wire.
>
> > > > Mike
>
> > > The only band I'm interested in receiving is the AM band. Most of the
> > > circuits I've seen on the web usually have at least one part I can't
> > > seem to find. I can probably buy litz wire from Dave Schmarder (the
> > > webmaster of the site I linked to) if I really really need it.- Hide quoted text -
>
> > > - Show quoted text -
>
> > I highly doubt you need litz wire for the AM band. In fact, too high
> > a Q at such relatively low frequencies will reduce your bandwidth to
> > the point where you'll lose the few highs that an AM signal contains.
> > So don't worry about it.
>
> > Make sure you can adjust the coupling between your antenna and the
> > detector. You'll need very loose coupling to prevent any strong
> > stations from pulling or otherwise overloading the detector.
>
> > Mike
>
> I know this is a stupid question, but what is coupling? Also, what
> size coil wire do I need?

I'm hoping this choke is suitable cat # R5300 @ http://www.dse.com.au

On Mar 13, 10:39=A0am, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 14, 1:34 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
>
>
>
>
> > On Mar 13, 10:06 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > On Mar 14, 12:59 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
> > > > On Mar 13, 3:43 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > > > I've been looking on the internet for regenerative radio plans, bu=
t
> > > > > haven't found any I like. =A0I was hoping someone here could help.=
=A0I
> > > > > want to build from scratch, no kits. I would prefer one with 1 or =
2
> > > > > tubes, preferably octal based or earlier, but miniature acceptable=
.. B+
> > > > > is to be no more than 45 volts, which is the usual from what I've
> > > > > seen. I also don't want one that requires litz wire for the coils,=

> > > > > pretty much impossible to get for me.
>
> > > > There should be a fair number of designs on the web, just google
> > > > away. =A0What frequencies are you trying to receive? =A0What don't y=
ou
> > > > like about the ones you've found? =A0The most common layout in the p=
ast
> > > > would probably be a detector followed by a stage of audio
> > > > amplification, e.g. a 6SJ7 driving a 6C5 (both octals), or one secti=
on
> > > > of a 6SL7 or 6SN7 driving the other section.
>
> > > > You shouldn't need litz wire - I believe that's only beneficial for
> > > > frequencies below the BC band. =A0Just use magnet wire.
>
> > > > Mike
>
> > > The only band I'm interested in receiving is the AM band. =A0Most of t=
he
> > > circuits I've seen on the web usually have at least one part I can't
> > > seem to find. I can probably buy litz wire from Dave Schmarder (the
> > > webmaster of the site I linked to) if I really really need it.- Hide q=
uoted text -
>
> > > - Show quoted text -
>
> > I highly doubt you need litz wire for the AM band. =A0In fact, too high
> > a Q at such relatively low frequencies will reduce your bandwidth to
> > the point where you'll lose the few highs that an AM signal contains.
> > So don't worry about it.
>
> > Make sure you can adjust the coupling between your antenna and the
> > detector. =A0You'll need very loose coupling to prevent any strong
> > stations from pulling or otherwise overloading the detector.
>
> > Mike
>
> I know this is a stupid question, but what is coupling? =A0Also, what
> size coil wire do I need?- Hide quoted text -
>
> - Show quoted text -

Coupling in this case is how the antenna signal is routed to the grid
of the detector. For example, this design http://www.mines.uidaho.edu/~glow=
bugs/12at7_regen.html
uses a small adjustable capacitor (C1). Alternately, I have seen the
antenna signal go through a few turns of wire which can be moved
closer to or farther from the detector grid coil to adjust the
coupling. In every case, the coupling should be set as loose or light
as possible while still being able to receive the desired station.

As to wire size, probably #26 to #30 would do.

Mike

On Mar 13, 11:08=A0am, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 14, 1:39 am, "Dave.H" <the19...@googlemail.com> wrote:
>
>
>
>
>
> > On Mar 14, 1:34 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
> > > On Mar 13, 10:06 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > > On Mar 14, 12:59 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
> > > > > On Mar 13, 3:43 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > > > > I've been looking on the internet for regenerative radio plans, =
but
> > > > > > haven't found any I like. =A0I was hoping someone here could hel=
p. =A0I
> > > > > > want to build from scratch, no kits. I would prefer one with 1 o=
r 2
> > > > > > tubes, preferably octal based or earlier, but miniature acceptab=
le. B+
> > > > > > is to be no more than 45 volts, which is the usual from what I'v=
e
> > > > > > seen. I also don't want one that requires litz wire for the coil=
s,
> > > > > > pretty much impossible to get for me.
>
> > > > > There should be a fair number of designs on the web, just google
> > > > > away. =A0What frequencies are you trying to receive? =A0What don't=
you
> > > > > like about the ones you've found? =A0The most common layout in the=
past
> > > > > would probably be a detector followed by a stage of audio
> > > > > amplification, e.g. a 6SJ7 driving a 6C5 (both octals), or one sec=
tion
> > > > > of a 6SL7 or 6SN7 driving the other section.
>
> > > > > You shouldn't need litz wire - I believe that's only beneficial fo=
r
> > > > > frequencies below the BC band. =A0Just use magnet wire.
>
> > > > > Mike
>
> > > > The only band I'm interested in receiving is the AM band. =A0Most of=
the
> > > > circuits I've seen on the web usually have at least one part I can't=

> > > > seem to find. I can probably buy litz wire from Dave Schmarder (the
> > > > webmaster of the site I linked to) if I really really need it.- Hide=
quoted text -
>
> > > > - Show quoted text -
>
> > > I highly doubt you need litz wire for the AM band. =A0In fact, too hig=
h
> > > a Q at such relatively low frequencies will reduce your bandwidth to
> > > the point where you'll lose the few highs that an AM signal contains.
> > > So don't worry about it.
>
> > > Make sure you can adjust the coupling between your antenna and the
> > > detector. =A0You'll need very loose coupling to prevent any strong
> > > stations from pulling or otherwise overloading the detector.
>
> > > Mike
>
> > I know this is a stupid question, but what is coupling? =A0Also, what
> > size coil wire do I need?
>
> I'm hoping this choke is suitable cat # R5300 @www.dse.com.au- Hide quoted=
text -
>
> - Show quoted text -

Might work, but 1mH is kinda small. For AM band I might even go above
2.5 to 5mH. This is the kind of thing you're looking for:
http://www.oselectronics.com/ose_p91.htm#3-Pi%20CHOKES

Mike

On Mar 14, 2:37 am, Mike Silva <snarflem...@yahoo.com> wrote:
> On Mar 13, 11:08 am, "Dave.H" <the19...@googlemail.com> wrote:
>
>
>
> > On Mar 14, 1:39 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > On Mar 14, 1:34 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
> > > > On Mar 13, 10:06 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > > > On Mar 14, 12:59 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
> > > > > > On Mar 13, 3:43 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > > > > > I've been looking on the internet for regenerative radio plans, but
> > > > > > > haven't found any I like. I was hoping someone here could help. I
> > > > > > > want to build from scratch, no kits. I would prefer one with 1 or 2
> > > > > > > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > > > > > > is to be no more than 45 volts, which is the usual from what I've
> > > > > > > seen. I also don't want one that requires litz wire for the coils,
> > > > > > > pretty much impossible to get for me.
>
> > > > > > There should be a fair number of designs on the web, just google
> > > > > > away. What frequencies are you trying to receive? What don't you
> > > > > > like about the ones you've found? The most common layout in the past
> > > > > > would probably be a detector followed by a stage of audio
> > > > > > amplification, e.g. a 6SJ7 driving a 6C5 (both octals), or one section
> > > > > > of a 6SL7 or 6SN7 driving the other section.
>
> > > > > > You shouldn't need litz wire - I believe that's only beneficial for
> > > > > > frequencies below the BC band. Just use magnet wire.
>
> > > > > > Mike
>
> > > > > The only band I'm interested in receiving is the AM band. Most of the
> > > > > circuits I've seen on the web usually have at least one part I can't
> > > > > seem to find. I can probably buy litz wire from Dave Schmarder (the
> > > > > webmaster of the site I linked to) if I really really need it.- Hide quoted text -
>
> > > > > - Show quoted text -
>
> > > > I highly doubt you need litz wire for the AM band. In fact, too high
> > > > a Q at such relatively low frequencies will reduce your bandwidth to
> > > > the point where you'll lose the few highs that an AM signal contains.
> > > > So don't worry about it.
>
> > > > Make sure you can adjust the coupling between your antenna and the
> > > > detector. You'll need very loose coupling to prevent any strong
> > > > stations from pulling or otherwise overloading the detector.
>
> > > > Mike
>
> > > I know this is a stupid question, but what is coupling? Also, what
> > > size coil wire do I need?
>
> > I'm hoping this choke is suitable cat # R5300 @www.dse.com.au-Hide quoted text -
>
> > - Show quoted text -
>
> Might work, but 1mH is kinda small. For AM band I might even go above
> 2.5 to 5mH. This is the kind of thing you're looking for:http://www.oselectronics.com/ose_p91.htm#3-Pi%20CHOKES
>
> Mike

Perhaps if I wire 2 chokes in series as someone previously mentioned?
I might add more later.

On Mar 13, 11:40=A0am, "Dave.H" <the19...@googlemail.com> wrote:
>
> Perhaps if I wire 2 chokes in series as someone previously mentioned?
> I might add more later.- Hide quoted text -

The bigger problem is that the choke you're looking at is certainly
designed for much lower frequencies, and may have a lot more
capacitance than a choke intended for use at your frequencies. That
capacitance will translate to lower impedance (bad thing) at your
frequencies.

If you've got them already I'd say go ahead and try them. But if
you're going to buy them, I'd say buy the correct type instead.

Mike

Hi Dave

I just built a superregen receiver. It is excellent. I can pick up
FM and Air Traffic !!!

Let me know if your interested in which one i am talking about.

Shelton.

Archimedes (shelton.dcruz@gmail.com) writes:
> Hi Dave
>
> I just built a superregen receiver. It is excellent. I can pick up
> FM and Air Traffic !!!
>
Of course a superregen is just an extension of the basic regen.

A regen is an amplifier with positive feedback, or an oscillator with
controlled oscillation, depending on how you view it. The incoming signal
goes through the amplifier, comes out stronger, and gets fed back to
the input of the amplifier, where it gets amplified again, and so on.
Howard Armstrong got a patent on the idea, and at the same time as
inventing a receiver that was far better than already existed, in 1914,
he showed how tubes could be used as oscillators (which was a big jump
to, so those spark gap transmitters and alternator transmitters could
disappear).

But, it's finicky. The point where the most gain and selectivity occurs
is right on the verge of oscillation. That means a pretty unstable circuit,
and every time you move your hand near the regen or the antenna sways in
the wind, or the voltage varies, the regen can kick into oscillation, leaving
terrible squealing in your ears. IN some cases you want that oscillation,
to beat against an incoming signal, but you don't want it to happen
unexpectedly.

The regen however provided lots of gain in only one stage, and while it
had its limitations, so did the crystal radio (no active components) and
the TRF receiver (multiple tuned gain stages on the signal frequency, also
prone to oscillation).

Armstrong's next Big Invention was the superheterodyne receiver, the
patent was issued in 1920. Far more complicated, it beat the incoming
signal down to a fixed frequency where gain (and later selectivity)
could easily be had, not just because it was at the time lower in
frequency, but nothing needed adjusting in those gain stages after
alignment, unlike all the other receivers that often needed adjustment
every time you changed frequency.

Howard's regen patent was challenged, so he ended up in court. Just
before the trial started, he hooked up his regen receiver to refamiliarize
himself with the operation, and noticed an oddity that he had noticed
when he'd originally played with the regen receiver. ANd that's when
he discovered the notion of superregeneration, which he got a patent
for in 1922.

The superregen is a regen receiver. The only addition is something to
modulate the regen stage at an ultrasonic rate. It can be an external
stage, that makes visualizing what happens so much easier. Or, far
mroe common is the active stage of the regen detector is called upon
to oscillate at an ultrasonic rate in addition to acting as the regen
detector. This pulsing allows the regen detector to be on that verge
of oscillation where the gain is the highest, but always pulling it
back from there so it doesn't go into oscillation. It becomes a more
"stable" circuit, requiring no regeneration control or any other control
other than whatever is used to adjust frequency.

There was a time when you'd see regen receivers described and they
were treated as both regen and superregen, since it was only a minor
change, and done properly the same regen control that set things on
the verge of oscillation or into oscillation if that was desired, could
be turned up another notch and set the thing into oscillation at an
ultrasonic frequency and hence it becomse a superregenerative detector.

So Armstrong created three receiver schemes that were and remain the
three basic types of receivers over the years. Regens fell by the
wayside decades back, though their simplicity makes them useful
for project building. The superegen never really saw that much
commercial broadcast use, but it saw plenty of use at the higher
frequencies, and of course saw lots of use in cheap walkie talkies
and garage door opener receivers over the years, I gather right up
to the present.

The superhet had a slow start, it was useful but required all those
tubes. But of course, it really won out, virtually any radio or
tv set uses it. Only in recent years has any strong contender come
along.

Michael

On Mar 14, 3:08 pm, Archimedes <shelton.dc...@gmail.com> wrote:
> Hi Dave
>
> I just built a superregen receiver. It is excellent. I can pick up
> FM and Air Traffic !!!
>
> Let me know if your interested in which one i am talking about.
>
> Shelton.

I'm interested in that as a future project, if you have a schematic
please email it to the1930s@googlemail.com. Thanks

On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
> I've been looking on the internet for regenerative radio plans, but
> haven't found any I like. I was hoping someone here could help. I
> want to build from scratch, no kits. I would prefer one with 1 or 2
> tubes, preferably octal based or earlier, but miniature acceptable. B+
> is to be no more than 45 volts, which is the usual from what I've
> seen. I also don't want one that requires litz wire for the coils,
> pretty much impossible to get for me.
>
> Thanks for your help.
>
> Dave

I'm buying a one tube regen from Dave Schmarder. I don't get to build
it, but I fell in love with it as soon as I saw it, I couldn't resist.
It's using a #30 tube. Gotta love the shape of those things!
http://www.schmarder.com/radios/tube/1-30.htm

On Mar 14, 8:53 pm, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
>
> > I've been looking on the internet for regenerative radio plans, but
> > haven't found any I like. I was hoping someone here could help. I
> > want to build from scratch, no kits. I would prefer one with 1 or 2
> > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > is to be no more than 45 volts, which is the usual from what I've
> > seen. I also don't want one that requires litz wire for the coils,
> > pretty much impossible to get for me.
>
> > Thanks for your help.
>
> > Dave
>
> I'm buying a one tube regen from Dave Schmarder. I don't get to build
> it, but I fell in love with it as soon as I saw it, I couldn't resist.
> It's using a #30 tube. Gotta love the shape of those things!http://www.schmarder.com/radios/tube/1-30.htm

I'm planning to use egular Hi-Fi headphones with the set, would a 1k-8
ohm audio transfomrer work?
Cat # M0216 @ http://www.dse.com.au
Also how would I wire the audio output up so the mono sound comes
through both sides of the headphones?

On Mar 14, 5:53=A0am, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
>
> > I've been looking on the internet for regenerative radio plans, but
> > haven't found any I like. =A0I was hoping someone here could help. =A0I
> > want to build from scratch, no kits. I would prefer one with 1 or 2
> > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > is to be no more than 45 volts, which is the usual from what I've
> > seen. I also don't want one that requires litz wire for the coils,
> > pretty much impossible to get for me.
>
> > Thanks for your help.
>
> > Dave
>
> I'm buying a one tube regen from Dave Schmarder. I don't get to build
> it, but I fell in love with it as soon as I saw it, I couldn't resist.
> It's using a #30 tube. =A0Gotta love the shape of those things!http://www.=
schmarder.com/radios/tube/1-30.htm

Just keep in mind that you may be disappointed at the audio level from
this. Part of the reason for this is the fact that most modern
headphones are designed for good fidelity over high sensitivity. If
lack of volume turns out to be a problem, just add an audio stage
(another #30 would do nicely).

Mike

On Mar 15, 2:04 am, Mike Silva <snarflem...@yahoo.com> wrote:
> On Mar 14, 5:53 am, "Dave.H" <the19...@googlemail.com> wrote:
>
>
>
> > On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > I've been looking on the internet for regenerative radio plans, but
> > > haven't found any I like. I was hoping someone here could help. I
> > > want to build from scratch, no kits. I would prefer one with 1 or 2
> > > tubes, preferably octal based or earlier, but miniature acceptable. B+
> > > is to be no more than 45 volts, which is the usual from what I've
> > > seen. I also don't want one that requires litz wire for the coils,
> > > pretty much impossible to get for me.
>
> > > Thanks for your help.
>
> > > Dave
>
> > I'm buying a one tube regen from Dave Schmarder. I don't get to build
> > it, but I fell in love with it as soon as I saw it, I couldn't resist.
> > It's using a #30 tube. Gotta love the shape of those things!http://www.schmarder.com/radios/tube/1-30.htm
>
> Just keep in mind that you may be disappointed at the audio level from
> this. Part of the reason for this is the fact that most modern
> headphones are designed for good fidelity over high sensitivity. If
> lack of volume turns out to be a problem, just add an audio stage
> (another #30 would do nicely).
>
> Mike

Thanks, how would I add this audio stage? A diagram would help.

On Mar 14, 11:08=A0am, "Dave.H" <the19...@googlemail.com> wrote:
> On Mar 15, 2:04 am, Mike Silva <snarflem...@yahoo.com> wrote:
>
>
>
>
>
> > On Mar 14, 5:53 am, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > On Mar 13, 6:43 pm, "Dave.H" <the19...@googlemail.com> wrote:
>
> > > > I've been looking on the internet for regenerative radio plans, but
> > > > haven't found any I like. =A0I was hoping someone here could help. =
=A0I
> > > > want to build from scratch, no kits. I would prefer one with 1 or 2
> > > > tubes, preferably octal based or earlier, but miniature acceptable. =
B+
> > > > is to be no more than 45 volts, which is the usual from what I've
> > > > seen. I also don't want one that requires litz wire for the coils,
> > > > pretty much impossible to get for me.
>
> > > > Thanks for your help.
>
> > > > Dave
>
> > > I'm buying a one tube regen from Dave Schmarder. I don't get to build
> > > it, but I fell in love with it as soon as I saw it, I couldn't resist.=

> > > It's using a #30 tube. =A0Gotta love the shape of those things!http://=
http://www.schmarder.com/radios/tube/1-30.htm
>
> > Just keep in mind that you may be disappointed at the audio level from
> > this. =A0Part of the reason for this is the fact that most modern
> > headphones are designed for good fidelity over high sensitivity. =A0If
> > lack of volume turns out to be a problem, just add an audio stage
> > (another #30 would do nicely).
>
> > Mike
>
> Thanks, how would I add this audio stage? A diagram would help.- Hide quot=
ed text -
>
> - Show quoted text -

Search for Doerle Regen, that was a popular 2-tube regen typically
using #30 tubes. Here's one diagram I found:

http://www.philcorepairbench.com/doerle.htm