[NLRS] DEM 1296 transverter as a signal source

[John (JK) Kalenowsky, K9JK]

Jon and NLRSers,

Further to Jerry's comments...DEMI also sells a "WSS1152"
(with various suffix letters) that is based on a 192.005 MHz
Crystal OR may be specified with the same 192.000 MHz
Crystal that is used for their 1296 Transverters but the "key"
is that it produces a signal at 1152 MHz (or plus a little at
1152.03 MHz with 6x the 192.005 MHz Crystal and, of
course, plus/minus actual crystal operating frequency tolerance)
and the harmonics work out quite conveniently to be around
the weak signal operating frequencies.

HMMM...it's almost like someone was looking at that when
those weak signal operating frequency points were chosen...
but I'm sure it is JUST coincidence ;-) ;-) ;-).

UN-fortunately, I believe the actual frequency ranges
allocated to amateurs at 47 GHz and above are "close" but
not "in band" compatible with multiplications of 1152 MHz,
although folks who have equipment functioning up in those
frequency ranges are probably happy to get whatever they
can get.

Happy Holidays to everyone!

73, JK

----- Original Message ----- 
From: "Gerald" <geraldj at ispwest.com>
To: <nlrs at mailman.qth.net>
Sent: Sunday, December 18, 2005 17:06
Subject: Re: [NLRS] DEM 1296 transverter as a signal source




On Sun, 2005-12-18 at 17:58 -0500, W0ZQ at aol.com wrote:
>
> While playing around in the shack, I found that my newer 1296 DEM
> transverter is also a weak signal source for 2304, 3456, 10 GHz and 24
> GHz.   I didn't
> hook up my 5760 to try it, but I suspect that its  present there too.    I
> suspect its the 1296 LO and its  harmonics.   The signals appear on about
> 2304.010, 3456.010, etc.,  with S5 to S9 signal strength ..... handy.
>
> 73, Jon
> W0ZQ
>
Sure. With a 144 MHz IF, the LO for 1296 is on 1152. twice that is 2304,
three times in 3456, 5 times is 5760, 9 times is 10368 MHz. 21 times is
24,192 MHz.

-- 
73, Jerry, K0CQ
Dr. Gerald N. Johnson, electrical engineer
All content copyright, Dr. Gerald N. Johnson

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