The waveform display in the P3 TX monitor auto-ranges to keep the
modulation peaks within the display limits. However, if the forward
power gets high enough to over-range the ADC, then the waveform will be
clipped. With the 200W HF sensor, I believe the clipping level is about
240-250 watts, depending on the calibration.
With 100W out of the K3 and assuming 100% efficiency in the tuner, the
SWR would have to get up to about 7.7:1 to cause clipping of the
displayed waveform.
Alan N1AL
On 06/07/2016 01:23 PM, Bob Novas wrote:
I wondered if a high SWR affects the waveform that the P3 displays -
wouldn't the voltages be higher at high SWR? would that put the txmonitor
into a non -linear region?
-----Original Message-----
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Alan
Bloom
Sent: Tuesday, June 07, 2016 3:29 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Question re TXMON
There is no reason to disconnect the P3 from the sensor. The sensor can't
damage the P3.
I suppose there might be a danger of damaging the sensor if you are
running
high power into a very high SWR, but if it is in a range that the K3 ATU
can tune, I
can't imagine there would be a problem.
Alan N1AL
On 06/07/2016 10:37 AM, Steve via Elecraft wrote:
I have recently added P3 to my K3 and (surprise!) I love it. My
(previously owned) P3 came with TXMON. TXMON works fine with dummy
load, but often shows very high SWR readings when K3 ATU is used with
non-
resonant antenna.
I understand that the TXMON "looks at" antenna and doesn't know what
ATU is doing. My question is, "Is there any problem or danger to leave
the TXMON connected when using ATU on non-resonant part of antenna
bandwidth? My reason to ask is that tab to release TXMON sensor plug
is right up against top
RS232 plug and I need to disconnect that plug in order to disconnect
TXMON sensor cable.
TNX ES 73 de W3UEC (Steve)
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