[NLRS] demi 1296 transverter

[Dr. Gerald N. Johnson]

If its set up for an external antenna relay, it wouldn't be hard to add 
a PGA-103+ preamp and a MMIC power amp often using the RA18H1213G module 
to get to be a serious station. Both show up on epay regularly. I've 
worked lots of DX on 1296 with good openings and 3 watts in past 
decades. Need to get back on that band, need to put up a tower first.

The control board can be adjusted to use as little as a few milliwatts 
on transmit. Heating the transverter dummy load with lots if IF power 
makes the LO drift, probably not nearly as much as the DEMI 10 GHz 
transverters can move from that heat. The typical internal IF 
termination can dissipate 10 or 15 watts though the drive control 
section can't quite keep the mixer from be over driven. Not quite enough 
attenuation. One other option the seller hasn't mentioned is whether the 
IF is separated or set up for a transceiver. At one time there were 
separate boxes for that from DEMI and last week one of those was on 
QTH.com also.

The control board and the vintage LO boards documents may be hidden at 
DEMI. If you can't find them I have them in my computer files because 
they are used in my 10 GHz transverter and the 1296 transverter board 
was documented in QST and I think several of the VHF conference 
proceedings back when it was new.

One other source is boards from W1GHZ who has parts for a 1296 
transverter, quite low power though.

73, Jerry, K0CQ

On 4/10/2016 4:22 PM, brockt at w6gmt.com wrote:
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> There is a Demi 1296 transverter for sale on QTH older unit set up for 144
> in at 5 watts 3 watts out unit is setup for FT-817 which is the rig I have.
> Thoughts because of my location expect unit will be used mostly for roving.
>
> 73
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> Brock
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> ARS W6GMT
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> BROCK THOMSEN
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> PO BOX 222
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> MARCELL MN 56657
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> ITASCA COUNTY
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> EN37en
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>
>
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