[Elecraft] KAT2 and K60XV interaction

Tue Apr 13 17:07:00 2004

Hi

The problem I am having is when the KAT2 is connected to the K2 control =
board the loading on the VRFDET from the KAT2 is causing the ALC to work =
improperly. When setting the maximum output in the transverter menu to =
1.00 mw and setting the power out to maximum the output is only 0.65 mw =
this is also the value displayed on the K2. The KPA100 and KAT100 have =
tristate output op amps on the VRFDET line so they can be removed from =
the line by the firmware when they are not being used. The KAT2 does not =
have this type of circuit and the op amp driving the VRFDET line is =
always connected through a 47 ohm resistor. If there is no RF out of the =
KAT2 as is the case when using the low level transverter output then the =
op amp is setting a zero volts out this low impedance output is loading =
the VRFDET line. The K60XV has an op amp driving an emitter follower so =
it will take over the VRFDET line if required to control the ALC for =
transverter use. However the load by the KAT2 is too much so increasing =
the series resistor R6 in the KAT2 output solves the problem. I am using =
a 470 ohm resistor for R6 and this solves the problem with no affect on =
the operation of the KAT2.

Don Brown
KD5NDB

  ----- Original Message -----=20
  From: Philip L Carter<mailto:[email protected]>=20
  To: Don Brown<mailto:[email protected]>=20
  Cc: Elecraft<mailto:[email protected]>=20
  Sent: Tuesday, April 13, 2004 12:19 PM
  Subject: Re: [Elecraft] KAT2 and K60XV interaction

  I too am using the kat2 and the kx60v with a split kat100/kpa100.  =
When I
  measured the output at the xvtr ouyt jacks with the com120c analyzer, =
I
  noticed no problems.  With the output programmed to 1mw, I recorded =
1mw on
  the analyzer.  All firmware was updated at the same time in all =
modules.

  Did I miss something here?  I thought if the output was coming from =
the
  xvtr out jacks, the kat2 was ouit of the picture.  I didn't test it at =
the
  antenna output jacks at that point.  I thought the swr bridge was =
after
  the kat2.

  Phil #370

  NRE/COLE Test Center OH-3
  [email protected]<mailto:[email protected]> or =
[email protected]<mailto:[email protected]>
  Philip L. Carter, WD8QWR
  wd8qwr@w8cqk.#cmh.oh.usa.na<mailto:wd8qwr@w8cqk.#cmh.oh.usa.na>

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