[NLRS] RE: [CVVHF] Harmonically related microwave frequencies

[Charles & Joan Betz]

Scott,

You are correct, they are all harmonically derived.

As for your comment about using one L.O. board, you would be in the bands,
but you will never work anybody.  You have to remember that everybody else
is also using 144 MHz I.F. with their transverters.  1296 to 1269 is a
difference of 27 MHz, well outside the 4 MHz tuning range of a 144 MHz
radio.  Nobody else is going to be able to tune far enough to work you.

Charlie, N0AKC



-----Original Message-----
From: CVVHF-bounces at cvvhf.org [mailto:CVVHF-bounces at cvvhf.org] On Behalf Of
Scott
Sent: Saturday, November 19, 2005 2:47 PM
To: Chippewa Valley VHF Group; NLRS List
Subject: [CVVHF] Harmonically related microwave frequencies

Question:

Where exactly did the normal calling frequencies on the microwave bands 
(2304.1, 3456.1, 5760.1, 10368.1) come  from?  Seems to me it is 
harmonically derived, ie 144 X 3 = 432, etc.

I'm looking at adding bands (have 10368 now).  DEMI transverter kits all 
come with an external (not part of the transverter board) LO board.  It 
seems wasteful to have to have 4 LO boards with 4 different crystals to 
run 4 microwave bands.  If I set up one LO board to run at 1125 MHz (for 
example), I could get signals (144 MHz IF) at 1269.1, 2394.1, 5769.1 and 
10269.1 ... not the traditional frequencies, but still within band 
edges.  Seems I would get more bang for the buck.  In fact if I ordered 
3 transverter boards with parts only, I could get the fourth for free by 
not having to pay for 3 LO boards.  I know these wouldn't fall into the 
ARRL bandplans, but being cheap, I could get on more bands without so 
much approval from the local war department...

Comments?

-- 
Scott N0EDV
http://corbenflyer.tripod.com/
Gotta Fly or Gonna Die

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