[ARC5] ARC5 Digest, Vol 107, Issue 172

Wed Dec 26 12:29:39 EST 2012

Many thanks David for the SS converter schematic and notes.  It looks simple enough  ... and I can't wait to try it out.73's,-Tom  KE4RHH

> From: arc5-request at mailman.qth.net
> Subject: ARC5 Digest, Vol 107, Issue 172
> To: arc5 at mailman.qth.net
> Date: Wed, 26 Dec 2012 12:00:05 -0500
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> Today's Topics:
> 
>    1. Re: 75 Mtr to "Q-5er" Converter. (Ian Wilson)
>    2. Re: 75 Mtr to "Q-5er" Converter. (Geoff)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 26 Dec 2012 08:50:03 -0800
> From: Ian Wilson <ianmwilson73 at gmail.com>
> To: David Stinson <arc5 at ix.netcom.com>
> Cc: boatanchors at mailman.qth.net, boatanchors at theporch.com,	ARC-5 List
> 	<arc5 at mailman.qth.net>, milsurplus at mailman.qth.net
> Subject: Re: [ARC5] 75 Mtr to "Q-5er" Converter.
> Message-ID:
> 	<CAEz8jcRKxL09bYdCxq4mAx3bfSKQjLCNuuWEtEftdWCwE3mmAg at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> Very handy, Dave, thank you.
> 
> However, I seem to recall that the range sets that I have don't have a BFO.
> So the
> converter would allow AM reception only.
> 
> e.g. BC1206 schematic: http://www.freeinfosociety.com/media.php?id=5038
> 
> You could add a tunable 75m oscillator to your converter to act as a BFO.
> It would need to be tuned to 262kHz (if that is the BC-1206 IF) away from
> the
> station being received, but would be simple and would require no mods to the
> beacon RX.
> 
> 73, ian K3IMW
> 
> 
> On Wed, Dec 26, 2012 at 7:10 AM, David Stinson <arc5 at ix.netcom.com> wrote:
> 
> > I've been asked a couple of times about this simple converter which can be
> > used to receive 75 meters (or any other band)
> > on your little 200-400 KC aircraft "Range" sets:
> >
> > http://home.netcom.com/~arc5/**converter.JPG<http://home.netcom.com/~arc5/converter.JPG>
> >
> > The operative word is "simple," and I find the trade-offs for keeping it
> > so acceptable.  Not even slightly interested in building something for the
> > bridge of the Starship Enterprise
> > because it might be 13.725% "better" ;-)
> >
> > I used a color-burst crystal (3580 KC as in the diagram)
> > because they are cheap and plentiful.
> > 3880 KC will appear at 300 KC on the dial.
> > However- there will be images from the 3.2 MC SWBC
> > stations lower in the band.    I don't worry about this
> > because I'm only going to use the rig from 3870-3890 anyway.
> > You can add a "wave trap," which is just copies of  L1's secondary and C1
> > in series with the antenna lead, which you tune to reject the SWBC.
> >
> > If you have a crystal in the 4180 KC range, the image freqs will be in
> > 4480 KC area, which should be quieter.
> >
> > Open the power lead to the converter during transmit
> > and your TR switching for these little rigs is done,
> > unless you're running a KW.  Might want to protect the input to the chip
> > if you do that.
> >
> > Remember that most of these "Range" receivers have very sharp IFs, which
> > can restrict recovery
> > of speech sidebands ( meaning "sound crummy" ;-)
> > Often, one can "stagger-tune" the IFs- tune the first a little low, the
> > middle right on, the last a little high- trading some gain for more
> > bandwidth.
> > There are other ways.  If using a BC-453, just push
> > all the little "sticks" on the top of the IF cans all the way in.
> >
> > Back to work for me,
> > 73 Dave AB5S
> >
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> 
> ------------------------------
> 
> Message: 2
> Date: Wed, 26 Dec 2012 11:50:30 -0500
> From: "Geoff" <geoffrey at jeremy.mv.com>
> To: "Mike Everette" <radiocompass at yahoo.com>,	<arc5 at mailman.qth.net>
> Subject: Re: [ARC5] 75 Mtr to "Q-5er" Converter.
> Message-ID: <0BD63FD801B84089B7E130723A76A3CE at computer1>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> 	reply-type=original
> 
> In the late 50's I used one behind a HQ-129X and I have a similar setup 
> today with different versions of both.
> 
> Works just as good now even on BCB DXing to dig in between flamethrowers or 
> dig out those 9 kc channelized foreign stations.
> 
> Carl
> 
> 
> Subject: Re: [ARC5] 75 Mtr to "Q-5er" Converter.
> 
> 
> One of my friends used a Gonset G-66 (?) mobile converter from the 50s in 
> front of a Q5er.  It worked very well indeed.
> 
> 73
> 
> Mike
> W4DSE
> 
> 
> 
> 
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> End of ARC5 Digest, Vol 107, Issue 172
> **************************************