[NLRS] Question -- 2m transverter (30w) driving higher band transverters - response

[Jim Froemke]

Hi Bill.
 
I also use a recent DEMI 144-28 Xverter at a reduced power output to drive
the 144 MHz IF for 902 - 10 GHz. I wanted to limit the max power output of
the Xverter so Steve recommended that I reduce the bias voltage from the
normal ~+5 VDC to just over +4 VDC. That limits the gain of the power output
module (Toshiba SAV33) and therefore the power output to just under 5 watts
which I feel better about (then it goes through 240' of LMR400 over to and
up the tower to the microwave electronics box). I'm not sure that this would
work with the older units that use a different power output module (check
with Steve).

Hope everything is going well with you and your family.

73, Jim
K0MHC
EM00

-----Original Message-----
From: nlrs-bounces at mailman.qth.net [mailto:nlrs-bounces at mailman.qth.net] On
Behalf Of Bill Davis Jr
Sent: Friday, November 06, 2009 6:29 PM
To: NLRS Reflector
Subject: [NLRS] Question -- 2m transverter (30w) driving higher band
transverters




  A question out there for you rover builders, I would guess. I have done a
major rebuild here and "AFTER THE FACT" have a question. I am using a 35w
DEM 2m transverter to drive my 902, 1296 and 10Ghz transverters. This is a
new configuration here. In the past these were driven at different times a
Kenwood TS700, a Yaesu 290R II and a 28Mhz Softrock/DEM transverter
combination. With the new setup I have been successful with obtaining good
drive levels using the power settings on the IF rig as well as pads and DEM
drive adjustments.

  The question is ... I am running the 35W DEM transverter at a watt or 2.
This is VERY low in it's dynamic range. Will I have degraded linearity or
some other "sleeping dog"  issues due to this? So far not any Qs other than
on "non-transverter" bands. Oh a Q with KB0CIM on 2m, but I am fighting an
issue with that TX chain at the moment.

  For almost 10yrs I  used my Icom 735 (100w HF rig) at reduced power
control settings to drive my 6m and 222 transverters with good sig reports
and no know issues. I was running at a VERY LOW power setting. I would think
even lower percentage wise than the DEM transverter.

Thanks .... 73  Bill   K0AWU  EN37ed


 		 	   		  
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