[NLRS] MM432 transverter

[Bill Davis Jr]

Hi Ted

   I'm not sure about which radio you are going to use with your MM transverter. HOWEVER, I would encourage you to post a message on the NLRS reflector. These guys have LOTS and LOTS of transverter experience and can provide local assistance. One needs to be extra careful with the MM because of the availability of parts. These MM units have been around for a VERY long time.  

NLRS Reflector(nlrs at mailman.qth.net)

   Several issues exist when operating with transverters..

      POWER spikes at the beginning of transmissions 
      Differences transceiver CW - SSB power levels
      Accidental "high power" into transverter 
      Etc

  I use "H pads" between the TX port and any transceiver that I drive a transverter with, as well as some dependable
power control. The "best" deal is a 5-10watt transceiver and a pad.

  CUL  ... Bill K0AWU  En37ed 



  

Date: Mon, 2 Mar 2009 11:45:11 -0600
Subject: Here is a guy I wish I could talk to
From: ted.gustafson at gmail.com
To: jimj at techie.com; cqbilld at msn.com; ted.gustafson at gmail.com

Too bad this guy is SK (LA8AK Jan Martin from Norway)  This guy was a sharp dude, lots of things out there that he had done when you start looking. This is how you get your drive for the transverter. Some of the good stuff is in Norwegian so hard to figure out. I found photos of a FT-7 he had set up for use with transverter  This is a link to his obituary http://www.agder.net/la8ak/   with a link at the bottom to a very large site with all sorts of stuff he was into. Here is a link to that http://www.agder.net/la8ak/index1.htm


The CW level control uses pin 12 on PB-1626.
To switch the function out for SSB the following arrangement can be used
                              PIN12 PB-1626
                                 I
+8V SSB                          C

------------10K--------------B       BC547/BC238B
                   I             E
                 2K2             I
                   I             I
                  GND           GND

Personally I use a single 10K potmeter linear for either SSB/CW gain and I

use a fixed trimpot for SSB-MIKE GAIN, connected under motherboard.
This was a later version, first I used the circuit as described, but later I
decided to change this because I use FT-7 with transverter, and in order to

keep equal power output for SSB and CW, and keep the carrier suppression high
for reduced power output, I changed the thing to have variable TX-gain for
SSB as well as CW.
I take the output from the driver, and leave the power amplifier module

without drive, RF output on 14/28MHz is about 5 mW, variable 40dB down.