[Elecraft] Transverter question

[Don Brown]

Hi

One simple mod you could do would be to change out the three 160 ohm 3 watt resistors in the internal dummy load with 160 ohm 5 watt resistors. This should allow you to go to 10-12 watts with no problem. You will need to use MOS type non inductive resistors. Mouser has them. I would stand them off away from the board a little more than shown in the manual to allow air around the resistors. They will get fairly hot.

Don Brown
  ----- Original Message ----- 
  From: Ron D'Eau Claire<mailto:rondec at easystreet.com> 
  To: elecraft at mailman.qth.net<mailto:elecraft at mailman.qth.net> 
  Sent: Friday, August 20, 2004 6:06 PM
  Subject: RE: [Elecraft] Transverter question


  Of course you don't want to add an attenuator in the receive signal path. . 

  The XV Transverter uses a simple resistive L-net attenuator inside on the TX
  circuit side of the Transmit/Receive switch. The attenuator is switched into
  the circuit that by jumpers when needed. 

  The first question I'd ask is to Elecraft about how much "overhead" was
  allowed in the attenuator design. You said the Kenwood would crank down to
  about 9 watts - 1 watt above the maximum specified. I'd be astonished if the
  attenuator design didn't allow for a 15% variation in the maximum input
  allowed. 

  Even if not, the place for a "heavier" attenuator is in the same point where
  the existing one is in the circuit. You can connect it easily using the
  jumpers already provided to avoid cutting any trances or in any way changing
  the basic XV circuit. There's lots of room inside the XV case. I bet you
  could build one to ride "piggyback" in the same box. 

  Be sure to use non-inductive resistors. Metal film are good normally. Keep
  the leads short and connect it via the jumper pins on the board. 

  Ron AC7AC

  -----Original Message-----



  > I'm helping a friend out who bought a 222 transverter from Elecraft 
  > but wants to use it with his TS850S.  The 850 will only go down to 9 
  > watts and the Elecraft wants a max of 8 watts, any help out there???


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