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

[Bry Carling]

I have a bunch of crystals around 4000 - 4200 khz if they would be useful for anybody's Q5er converter project.

Bry, AF4K


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
>
>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
>
>______________________________________________________________
>Boatanchors mailing list
>Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Boatanchors at mailman.qth.net
>
>List Administrator: Duane Fischer, W8DBF
>** For Assistance: dfischer at usol.com **
>
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html

regards,
Bry Carling

-- 
Sent from mobile phone.