[Elecraft] K2/XV144 Power Overshoot

[W4sc]

Hmmmmmmm   Maybe the same is causing my "Hi Curr" indication on HF 
occasionally.

2577

----- Original Message ----- 
From: "Dick Hanson" <k5and at adelphia.net>
To: "'Glenn McNeil'" <vk4tzl at bigpond.net.au>; <elecraft at mailman.qth.net>
Sent: Sunday, May 22, 2005 6:18 AM
Subject: [Elecraft] K2/XV144 Power Overshoot


> Hi Glenn...
>
> You have done a good job of sleuthing and pondering the various
> solutions.
>
> Bottom line is that you may well need to communicate via email with the
> boys at Elecraft about this. If they have had other similar reports (or
> even if they have not), they will try for a solution. Also, you may well
> get a response from other VHFers that have been down this road.
>
> First, I believe you're correct in figuring it is the K2 and not the
> transverter.
> I have run into exactly the same issue with one of my VHF combos. I have
> a Yaesu FT-897 driving a Lunar 2 meter amp (pair of 3CPX800, with very
> sensitive grid trip circuitry). Same exact problem. Yaesu tech support
> told me how to adjust some of the ALC circuitry to "tune out" or at
> least minimize the initial ALC related overshoot.
> This helped a lot. Then I "slowed down" the pulse in the grid trip
> circuit in the amp by adding slightly more capacitance to one of the
> time constant caps. The combination of these two things solved my
> problem. I did not try the in-line attenuator approach, but that may be
> helpful too. You could easily fashion a 3 db attenuator out of a length
> of RG-174 mini coax. It has a healthy amount of "loss" per foot, so you
> could quickly calculate how many feet you would need to arrive at 3 db.
>
> I have both the XV-50 and XV-144 now to use with my K2 but have not yet
> used them in our VHF contest station with an external amp to observe
> whether this phenomenon exists. I will hasten to do some testing and get
> back to you on this.
>
> Good luck.
> Dick
>
> -----Original Message-----
> From: elecraft-bounces+k5and=adelphia.net at mailman.qth.net
> [mailto:elecraft-bounces+k5and=adelphia.net at mailman.qth.net] On Behalf
> Of Glenn McNeil
> Sent: Saturday, May 21, 2005 22:55
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K2/XV144 Power Overshoot
>
>
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