[K2] K60XV 0dBm output

[zeke7237]

Hi List ..

My winter project for the Jitney is to convert my 144 IF levels to
0dBm up to the transverters to avoid horrible disasters that were
happening with +30dBm IF levels ;)

I've got my microwave station ripped out of the Jitney and on the
bench, and I'm going through everything setting levels before I start
modifying stuff. I noticed that I could only get about -6dBm maximum
out of the K60XV in tune mode and discovered that that limitation was
caused by the autotuner being enabled so I fixed that.

The most I can make come out of the thing in tune mode now is about
-4dBm (0.4mW) ... and this is with the transverter band output levels
set to 1.27mW (+1dBm). R6 in my KAT2 doesn't seem have any effect
(it's at 470R now). I'm measuring with my trusty but idiosyncratic
General Microwave 476 power meter, which is pretty much right on the
money at 28MHz.

Anyone have any ideas where to look? I'm going to go grab the VHF/UHF
K2 and check it next ..

de w1rt/john
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[zeke7237]

Well, for those following along I've figured this out ..

Backstory: I rove in V/U/uW contests with 11 bands, using a pair of
K2s as IF radios, a stack of XVs for low 4 bands, and a collection of
surplus, commercial, and homebrew stuff for the microwaves through 24G

Last winter's project was a move of the IF from 144 to 145MHz, but I
did this by tuning the K2 up to 29.1 and didn't pay attention to the
fact that it's only supposed to go up to 28.8 .. the net effect being
reduction in RX and TX both. I discovered this when I was working on
the level conversion project .. I couldn't get much power from the uW
K2. The low-band K2 was fine, with it's IF at 28.1, and that's when I
realized what was going on.

I ended up applying Sverre's 10M filter mod and tuning 10 up to 29.1
.. I now get +2dBm at 29.1 and just a tad under +1dBm at 28.1, which
is exactly what I need :)

de w1rt/john

On Thu, Dec 29, 2011 at 9:42 PM, John D'Ausilio <[hidden email]> wrote:

> Hi List ..
>
> My winter project for the Jitney is to convert my 144 IF levels to
> 0dBm up to the transverters to avoid horrible disasters that were
> happening with +30dBm IF levels ;)
>
> I've got my microwave station ripped out of the Jitney and on the
> bench, and I'm going through everything setting levels before I start
> modifying stuff. I noticed that I could only get about -6dBm maximum
> out of the K60XV in tune mode and discovered that that limitation was
> caused by the autotuner being enabled so I fixed that.
>
> The most I can make come out of the thing in tune mode now is about
> -4dBm (0.4mW) ... and this is with the transverter band output levels
> set to 1.27mW (+1dBm). R6 in my KAT2 doesn't seem have any effect
> (it's at 470R now). I'm measuring with my trusty but idiosyncratic
> General Microwave 476 power meter, which is pretty much right on the
> money at 28MHz.
>
> Anyone have any ideas where to look? I'm going to go grab the VHF/UHF
> K2 and check it next ..
>
> de w1rt/john

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