Sounds like a good article/presentation for a VHF conference or even
QEX/QST. Write something up Mike. The Southeastern VHF Conference is
coming up in April in Charlotte, NC. I hope to see you there!
73
Jim, W4KXY
-----Original Message-----
From: vhfcontesting-bounces@contesting.com
[mailto:vhfcontesting-bounces@contesting.com] On Behalf Of Michael Sapp
Sent: Thursday, October 23, 2008 1:03 PM
To: vhfcontesting@contesting.com
Subject: Re: [VHFcontesting] 222 and 902/3 transverters
Hi Folks: For anyone considering building their own 222 and 902/3 MHz
transverters as an alternative to buying a kit or ready made transverter
consider this LO scheme. If you use a 170MHz LO on 222MHz with a 52MHz IF
(170+52= 222) , it can also be used as a common LO for 902/903. The 170Mhz
x5 is 850Mhz + 52 Mhz = 902. With radios like the ft-817 so popular as
transverter drivers using the 6 meter IF is not a problem, and the 52 or 53
Mhz (903) IFs will be far enough away from 50.125 MHz so as to not be a
conflict in a multi-op contest situation. You could even use common MMICs in
the TX/RX amplifier chains and swap BPFs with PIN diodes or small relays.
Henry Radio has also been selling some low cost ($10~20) broadband
amplifier modules on ebay to get into the 1~3 watt range, so it's not like
you have to fork out $60~$90 for final TX amplifiers.
Since the 222 and 902/3 MHz bands have always been "odd man out" as far as
commercial radios one would think a two-for-one transverter would be an
attractive option for many VHF/UHF ops. I'm surprised no one has taken
advantage of this option as I have yet to see something like this show up in
ham radio literature. Mike WA3TTS
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