[ARC5] 75 Mtr to "Q-5er" Converter.

[Mike Everette]

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

--- On Wed, 12/26/12, David Stinson <arc5 at ix.netcom.com> wrote:

> From: David Stinson <arc5 at ix.netcom.com>
> Subject: [ARC5] 75 Mtr to "Q-5er" Converter.
> To: boatanchors at mailman.qth.net, boatanchors at theporch.com, milsurplus at mailman.qth.net, "ARC-5 List" <arc5 at mailman.qth.net>
> Date: Wednesday, December 26, 2012, 10:10 AM
> 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
> 
> 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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