[AMRadio] Homebrew Receivers (was: receiver tests for Theo)


Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Tue Mar 7 10:17:29 EST 2006


There are some old pictures on the link below.

 
http://wa5bxo.shacknet.nu/N2DTS/


A few guys have built the receiver with good results.

My own pieced together design based on various handbooks 
(bill orr mostly).

Brett





> -----Original Message-----
> From: amradio-bounces at mailman.qth.net 
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Theo Bellamy
> Sent: Tuesday, March 07, 2006 9:58 AM
> To: Discussion of AM Radio
> Subject: [AMRadio] Homebrew Receivers (was: receiver tests for Theo)
> 
> Brett,
> 
> I sure would like to see some pics of your homebrew receiver, 
> and hear some
> more about it's design (tube lineup, if strip, audio section, 
> etc). I have
> never built a receiver. Lots of amps, some cw transmitters, 
> and lots of
> accessories and surplus mods, but no receivers. Did you 
> design it yourself,
> or did you pattern it after a published design (like the 
> famous HBR series)?
> 
> My requirements are for AM only on 160, 80, and 40, with attractive
> "classic" appearance and controls that are pleasing to use. 
> This is for a
> station that will be installed in the den so it can't be an 
> "ugly mess o'
> wires n' boxes".
> 
> Theo K4MO
> 
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net]On Behalf Of Brett gazdzinski
> Sent: Tuesday, March 07, 2006 9:36 AM
> To: 'Discussion of AM Radio'
> Subject: RE: [AMRadio] receiver tests for Theo
> 
> 
> My recording setup is an old cassette tape deck that happens
> to be rack mount.
> 
> The receiver filter is 5.5Kc since my ears don't work well
> at high frequencies, so the recording is limited...
> 
> I have never taken an analog tape and converted it to
> a digital format.
> I would wonder how good a typical sound card would work
> converting analog to digital.
> 
> On the subject of picking a receiver, I got tired of
> the limitations or flaws of all the commercial stuff, it
> seems every receiver is a compromise between cost and function,
> some had great audio but you had no idea of the frequency you were on.
> Others did SSB very well, and AM lousy.
> Some did AM well, and ssb poorly.
> Some looked very cool, some were very ugly.
> Some drifted, some were stable.
> Some were very quiet (old stuff) some were very noisy (new stuff).
> Some had good bandwidth choices, others had poor or no
> choices.
> Some make no provision for TX muting.
> 
> If you don't want to band hop, the r390 series works very well on AM,
> although it needs outboard audio and is on the noisy side.
> 
> My homebrew receivers were built to function, I want low noise,
> low distortion, accurate frequency readout, 160, 80 and 40 meter
> coverage, a xtal BFO for zero beating AM signals, a scope output,
> an S meter, and good AM selectivity choices.
> As an added benefit, I made it look like the rest of the
> home brew stuff, and made it so when you switch bands it goes
> from 1880, to 3880, to 7290 when you change bands.
> 
> They SEEM to work well, but I need someone with good hearing
> to really nit pick them.
> 
> Eventually, I want to add many bandwidth choices, 4, 5, 6, 
> and 8Khz maybe.
> 
> Other than the homebrews, I only have the G76 and an Icom 756 pro.
> The G76 has audio amp limitations, the 756 is very noisy, and rolls
> off the low end even with outboard audio.
> There are many times I could not copy signals on the R390a or the 756
> that were good copy on the homebrews, weak signals on quiet bands is
> where the homebrews really shine.
> 
> I would think an NC300 or 303 with outboard audio might be reasonable
> and sound good.
> The R390 series has a scope output built in, and it works well
> on receive and transmit. Its got muting, its accurate, but it
> is expensive and trouble prone..
> 
> Just my two cents...
> 
> Brett
> N2DTS
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> > -----Original Message-----
> > From: amradio-bounces at mailman.qth.net
> > [mailto:amradio-bounces at mailman.qth.net] On Behalf Of VJB
> > Sent: Monday, March 06, 2006 2:01 PM
> > To: amradio at mailman.qth.net
> > Subject: [AMRadio] receiver tests for Theo
> >
> > Theo,
> >
> > In addition to looking up some AMers around your area,
> > I'd recommend asking for some sound files from people
> > who can record from the receiver candidates.
> >
> > This past weekend Brett N2DTS and myself were in QSO
> > on 40m with a fellow running a very clean sounding
> > DX-100. We both rolled tape on a specific part of the
> > guy's transmission. Brett if you still have that sound
> > file, maybe render it down to an MP3 and I'll do the
> > same?
> >
> > We can then describe receivers.
> >
> > Meantime, there are some other sound files kicking
> > around that are worth downloading. I've got a few that
> > I remember what receiver I used:
> >
> > >From the diode of an SP600 at 13Kc selectivity:
> > http://www.wa3vjb.com/sound/HUZ-FT102%20(2).mp3
> >
> > >From the diode of an R390 at 16kc selectivity:
> > http://www.wa3vjb.com/sound/W2DTC-doodler.mp3
> >
> > >From the "line output" of an R390A at 8Kc:
> > http://www.wa3vjb.com/sound/W0VMC.mp3
> >
> > Steve, WB3HUZ has a pile o' files too:
> > http://www.amwindow.org/audio/htm/audio.htm
> >
> > Here is the sound of a 51S-1F up on 10 meters AM:
> > http://www.amwindow.org/audio/mov/f5hsh.mov
> >
> >
> > In addition, check this batch of wav and MP3:
> > http://www.amfone.net/audio/
> >
> > These will give a continuum of sound quality for sure.
> >
> > Paul/VJB
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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