Do just a bit more math, and the 850 Mhz LO can be used with a 446 Mhz IF
to put you on 1296 as well!
At MUD 2005 I found an 850 Mhz phase-locked LO and
homebrewed a 903/1296 transverter with it... One oscillator, one mixer,
lots of switching, and two bands out of one box.
Oddly enough, I found a homebrew 222 Mhz transverter (52Mhz IF) at a
local hamfest for $25.00... Will have to count the LO to see where its
running...
Along these lines you can take the 3312 Mhz LO from your 3456-144
transverter, triple it, and have a 432Mhz IF on 10368.
Same stunt with 1872 Mhz LO on 2304, (432 IF)... Triple the 1872 Mhz and
you get 144 Mhz IF on 5760.
So, it looks like only THREE phase-locked LO chains need to be built to
get onto a bunch of ham bands if one utilizes appropriate multipliers...
Eric
KB7DQH
> Wow Mike,
> That sounds like an awesome construction project.
>
> It would really be cool if we could get a group to "kit" the
> project......hint, hint.........
>
> 73
> Dan
> --
> K9ZF /R no budget Rover ***QRP-l #1269 Check out the Rover Resource Page
> at:
> <http://www.qsl.net/n9rla> List Administrator for:
> InHam+grid-loc+ham-books
> Ask me how to join the Indiana Ham Mailing list!
>
>
>
> Michael Sapp wrote:
>> 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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>>
>>
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