P3 Clicking

[John_N1JM]

Normally when you change bands with the K3 the P3 will click(relay?) once and the scope level will drop down a little. Recently I hear the click happen ever once in awhile just sitting there no band change. Is there something failing?

73, John N1JM

[John_N1JM]

On further investigation it appears to only happen on 40 meters and I discovered I had the preamp on. Once I turned the preamp off the clicking seems to have disappeared. If this has something to do with high signal level, I'm only listening to -110dbm noise.

73, John N1JM

John_N1JM wrote

Normally when you change bands with the K3 the P3 will click(relay?) once and the scope level will drop down a little. Recently I hear the click happen ever once in awhile just sitting there no band change. Is there something failing?

73, John N1JM

[Alan Bloom]

The relay bypasses the P3's preamp when the signal level starts to
overload the front end.  On 40 meters strong SW broadcast signals (that
you can't see on the screen) can cause that to happen.

Alan N1AL


On 03/22/2014 06:04 AM, John_N1JM wrote:

> On further investigation it appears to only happen on 40 meters and I
> discovered I had the preamp on. Once I turned the preamp off the clicking
> seems to have disappeared. If this has something to do with high signal
> level, I'm only listening to -110dbm noise.
>
> 73, John N1JM
>
>
> John_N1JM wrote
>> Normally when you change bands with the K3 the P3 will click(relay?) once
>> and the scope level will drop down a little. Recently I hear the click
>> happen ever once in awhile just sitting there no band change. Is there
>> something failing?
>>
>> 73, John N1JM
>
>
>
>
>
> -----
> 73, John N1JM
> K3 #5986
> P3 #1752
> KPA500 #596
> KX3 #926
> XG3
> XG1
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/P3-Clicking-tp7585827p7585828.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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[Matt Zilmer-3]

John,

Maybe it's -110 dBm average noise, but with -20 dBm static crashes?
Normally you would see these as broad lighter areas on the waterfall,
short duration.

You may also have a noise source that's peaking high, but outside of
the P3's visible span range.  If it's anywhere near 40m, the P3 would
still pick it up and it might cause the detector to disable the
preamp.  I've had this happen with SWBC signals on voice peaks.  This
(or some similar cause) could explain why you have this happening only
on 40m.

73,
matt W6NIA

On Sat, 22 Mar 2014 07:04:59 -0700 (PDT), you wrote:

>On further investigation it appears to only happen on 40 meters and I
>discovered I had the preamp on. Once I turned the preamp off the clicking
>seems to have disappeared. If this has something to do with high signal
>level, I'm only listening to -110dbm noise.
>
>73, John N1JM
>
>
>John_N1JM wrote
>> Normally when you change bands with the K3 the P3 will click(relay?) once
>> and the scope level will drop down a little. Recently I hear the click
>> happen ever once in awhile just sitting there no band change. Is there
>> something failing?
>>
>> 73, John N1JM
>
>
>
>
>
>-----
>73, John N1JM
>K3 #5986
>P3 #1752
>KPA500 #596
>KX3 #926
>XG3
>XG1

Matt Zilmer, W6NIA
--
"Give me six hours to chop down a tree and I will
spend the first four sharpening the axe." -A. Lincoln
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[John_N1JM]

Thanks, Matt. Sounds like a good explanation to me since it seems to go away with the preamp off.

73,
John N1JM

Matt Zilmer-3 wrote

John,

Maybe it's -110 dBm average noise, but with -20 dBm static crashes?
Normally you would see these as broad lighter areas on the waterfall,
short duration.

You may also have a noise source that's peaking high, but outside of
the P3's visible span range.  If it's anywhere near 40m, the P3 would
still pick it up and it might cause the detector to disable the
preamp.  I've had this happen with SWBC signals on voice peaks.  This
(or some similar cause) could explain why you have this happening only
on 40m.

73,
matt W6NIA

On Sat, 22 Mar 2014 07:04:59 -0700 (PDT), you wrote:

>On further investigation it appears to only happen on 40 meters and I
>discovered I had the preamp on. Once I turned the preamp off the clicking
>seems to have disappeared. If this has something to do with high signal
>level, I'm only listening to -110dbm noise.
>
>73, John N1JM
>
>
>John_N1JM wrote
>> Normally when you change bands with the K3 the P3 will click(relay?) once
>> and the scope level will drop down a little. Recently I hear the click
>> happen ever once in awhile just sitting there no band change. Is there
>> something failing?
>>
>> 73, John N1JM
>
>
>
>
>
>-----
>73, John N1JM
>K3 #5986
>P3 #1752
>KPA500 #596
>KX3 #926
>XG3
>XG1
Matt Zilmer, W6NIA
--
"Give me six hours to chop down a tree and I will
spend the first four sharpening the axe." -A. Lincoln
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