[Central-Electronics] VFO for 10B and 20A

[Paul Kraemer]

Another good basic vfo would be the remote vfo unit for the Heathkit SB 
line. I believe it is also 5 to 5.5
Anything would be better than butchering another command set---today 
anyway---and unless you have a BIG budget I doubt you will find a 
Lakeshore---take a number in line anyway.
Paul K0UYA
----- Original Message ----- 
From: "k7fm" <k7fm at teleport.com>
To: <>
Sent: Saturday, May 09, 2009 7:52 PM
Subject: Re: [Central-Electronics] VFO for 10B and 20A


> Hi Dave:
>
> Needing a vfo, this is a great chance to do a little building.
>
> There are a number of options.  The DDS is a good choice
>
> I had an old LM frequency meter without a calibration book, so I decided 
> to
> build a suitable vfo.  I stripped it, then built an fet vfo from 5 - 5.5
> MHz.  That covers 80 and 20 meters.  I had a bnc output on the front and a
> fet follower, to go to a digital frequency meter.  Then, I built 4 crystal
> oscillators and fed a double balanced mixer for the other bands.  Since I
> wanted to have fun with making my own calibration book, I just used old
> crystals in the junk box.  As long as they were "close enough" to mix with
> the vfo output to reach the desired band, that was good.  Total cost was
> zero, and I used up a few spare parts.
>
> There are a number of vfos out there that cover 5 -5.5.  I found an old
> external Yaesu vfo covering that frequency for 50 cents at a swap meet.
>
> Or, if you can find a stable signal generator, you can even use one of
> those.
>
> It is even easier if you just operate on a couple of bands.  You can have 
> a
> home brew vfo going in an hour or so.
>
> Doug DeMaw and Wes Hayward have given us a lot of ammunition to build 
> stuff
> with.
>
> 73,  Colin  K7FM
>
> ______________________________________________________________
> Central-Electronics mailing list
> Home: http://mailman.qth.net/mailman/listinfo/central-electronics
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Central-Electronics at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>