[NLRS] DEMI Transverters?

[Donn Baker]

'Morning, Scott.
The current DEMI transverters all use a "MICROLO;"  either a separate
board, or that circuit built into the transverter board itself.  All use
XTALs in the 180MHz range, which produces an output in the 1100 MHz area.

The 1296 transverter has the LO on the same board as the trasverter (I
believe... mine does, but its a few years old, and may not represent
current production.)  The others are the MICROLO board:
BAND     XTAL     MULTI    OUTPUT     XVRT MULTI  LO Inject (144MHz i.f.)
2304     180.000   X6      1080.000      X2       2160.000
2400     188.000   X6      1128.000      X2       2256.000
3456     184.000   X6      1104.000      X3       3312.000
5760     187.200   X6      1123.200      X5       5616.000
10368    189.333   X6      1136.000      X9       10224.000

Older DEMI units used the 540-580 MHz output range, but that was changed
maybe 2-3 years ago for the 180 MHz XTALS, and 1100MHz outputs.

If you wish to stay with 144 MHz i.f. (or any single i.f. frequency), it
may be a little hard to find a "common" XTAL to provide all the LO
injections frequencies needed.

73 Donn
WA2VOI/0



At 03:38 29-11-03 -0000, Scott wrote:
>Do the Down East Microwave transverters for say 1296, 2304 and 5760 use
>outboard Local Oscillators?  I assume they do and if so, are they all in the
>540-580 MHz range?  The reason I ask is that I plan to build for all of the
>above listed bands and want to see if one L.O. can pull multiple duty with
>appropriate multipliers after it.
>
>Thanks!
>
>Scott
>http://corbenflyer.tripod.com/
>Building RV-4
>Gotta Fly or Gonna Die!
>
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