> I know when turning the power control there is a known dead spot
> between 8 and 13 watts
That only happens on Six Meters and is documented in the manual.
> When I turn the Power knob from 8 to 13 in receive mode the
> receive gain jumps up 1 S unit almost like the preamp was turned on.
> I tried different setting of the preamp and the ATT but the gain wll
> always increase 1 S unit over whatever the S meter is reading when
> the power level indication moves from 8 to 13 watts..
I do not see that here. It sounds like you may have some issue in
the KPA3 bypass switching (bad bypass contacts in K1 on the KPA3IO
board?). Were you changing power across the "dead spot" in transmit?
> Regarding the dead spot 8-13 watts, I use a solid state amp and I
> can run either down around 400 watts or I can run up near 1 Kw but
> not in between due to the dead spot.
If 13 watts drive gives you 1 KW output, why not install a 6 dB
attenuator on the input (between the TR relay and the amplifier)
of the amplifier? That would allow you run between 250 and 1000 W
as the drive was varied from 13 to 53 watts. Even better, a 9 dB
attenuator would give you a range of 120 to 1000 W.
73,
... Joe, W4TV
On 8/14/2010 11:05 AM, k4pi wrote:
> Just finished installing the DSP board after the return from Aptos and then
> loading the latest program updates. I know when turning the power control
> there is a known dead spot between 8 and 13 watts which I hope them can
> correct soon, but I noticed that there is an increase in the receive gain at
> this point. When I turn the Power knob from 8 to 13 in receive mode the
> receive gain jumps up 1 S unit almost like the preamp was turned on. I
> tried different setting of the preamp and the ATT but the gain wll always
> increase 1 S unit over whatever the S meter is reading when the power level
> indication moves from 8 to 13 watts.. I am looking at it on 6 M and have
> not tried it on other bands but wondered if anyone else notices this?
> Nothing I can't live with..
>
> Regarding the dead spot 8-13 watts, I use a solid state amp and I can run
> either down around 400 watts or I can run up near 1 Kw but not in between
> due to the dead spot.
>
> 73 Mike K4PI
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
