I assume , due to the Q any small variation , will move
the tune point about , but looking in the
data base , Signals , better last night to sv8 than the
previous night , and may be up 1 db at pa7 , not to say
the noise was less , but at -10 db that level
will be much higher than the local noise level ,
should be a reliable indication
very similar at PA7EV , may be + 1 dB
2017-04-15 10:25:20 2E0ILY IO82QV PA7EY
JO22JJ 503 136 -13
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||_~13dB
2017-04-15
09:35:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-7
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~8dB
2017-04-15
08:45:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-8
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~9dB
2017-04-15
07:55:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-11
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||_~11dB
2017-04-15
07:05:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-10
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||_~11dB
2017-04-15
06:15:19 2E0ILY IO82QV PA7EY JO22JJ 503 136
-12
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||_~13dB
2017-04-15
05:25:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~10dB
2017-04-15
03:45:19 2E0ILY IO82QV PA7EY JO22JJ 503 136
-11
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||_~11dB
2017-04-15
02:55:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-11
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||_~11dB
2017-04-15
02:05:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-10
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~10dB
2017-04-15
01:15:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~9dB
2017-04-15
00:25:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~10dB
2017-04-14
23:35:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-12
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||_~13dB
2017-04-14
22:45:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~10dB
2017-04-14
21:55:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~10dB
2017-04-14
10:15:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-11
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||_~12dB
2017-04-14
09:25:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~9dB
2017-04-14
08:35:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-10
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~10dB
2017-04-14
07:45:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-10
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||_~11dB
2017-04-14
06:55:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~10dB
2017-04-14
06:05:19 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~10dB
2017-04-14
05:15:22 2E0ILY IO82QV PA7EY JO22JJ 503 136
-8
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~8dB
2017-04-14
04:25:19 2E0ILY IO82QV PA7EY JO22JJ 503 136
-10
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||_~11dB
2017-04-14
03:35:19 2E0ILY IO82QV PA7EY JO22JJ 503 136
-13
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||_~13dB
2017-04-14
02:45:19 2E0ILY IO82QV PA7EY JO22JJ 503 136
-17
Op32_||||||||||||||||||||||||||||||||||||||||||_~17dB
2017-04-14
01:55:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-13
Op32_||||||||||||||||||||||||||||||||||||||||||||||||_~14dB
2017-04-14
01:05:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-13
Op32_||||||||||||||||||||||||||||||||||||||||||||||||_~14dB
2017-04-14
00:15:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-13
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||_~13dB
2017-04-13
23:25:21 2E0ILY IO82QV PA7EY JO22JJ 503 136
-13
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||_~13dB
2017-04-13
22:35:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-9
Op32_||||||||||||||||||||||||||||||||||||||||||||||||||||||||||_~9dB
2017-04-13
21:45:20 2E0ILY IO82QV PA7EY JO22JJ 503 136
-14
Op32_||||||||||||||||||||||||||||||||||||||||||||||_~15dB
--------------------------------------------------
From:
"Chris Wilson" <
[email protected]>
Sent: Saturday, April 15, 2017
1:32 PM
To: <
[email protected]>
Subject: LF: Poor aerial
connection affecting gate waveforms??
> Hello LF'ers,
>
> A very happy Easter to everyone!
>
> I have a tech
question tthat I am sure you more
experienced
> operators can answer.
yesterday I mowed the lawn and found some
>
of my temporary earth leads connecting a square of ground
wires
> with 2 diaganols
to 8 foot ground posts had been eaten
by
> rabbits and were
disconnected. i re-made them and today
will
> finish them by
blting soldered eyelt tags to the pists
with
> stainless bolts and
covering them well with Galvafroid paint.
>
When I finished I had a meal and started the
night's TX on
> 137.550 as
normal. I saw a very poor gate and drain
waveform
> from my W1VD
style amp, the previous night they looked
normal
> 9and OK to me...). I assumed
it was to do with my fiddling with
>
the grounds. My Scopematch box also showed a slight
impedance
> mismatch and a
slight resonance mismatch. I attended to
both
> with the tapped matching coil
outside and the variometer in the
>
loading coil, but the waveforms on gate and drain remained
very
> spiky. I risked running and
signal reports seemed OK, if not as
> good
as the night before, using WSPR2 and OPERA.
>
> This morning i investigated
properly and put my 500W dummy load
> after
the LPF bank in the shack and the gate and drain
waveforms
> were back to
normal. I then put it outside after the
matching
> transformer, and
although there was an impedance mismatch
the
> gates and drains wave
forms were still fine. So i moved to the
>
loading coil. This has had reapirs to the
lead to vertical
> section of
the aerial, where it goes up from the coils
housing
> in a big wheelie
bin to where the ladder line vertical
secion
> goes up to meet
the horizontal loop top hat. it has two
"choc
> bloc" screw connectors
joing a new piece of wire where the old
>
one shorted out and burnt the insulation. They LOOKED fine,
but
> i decided to
remove them and properly solder in the
repair
> section and use adhesive lined
shrink tube to seal the joints.
>
>
Hey, gates and drains now back to normal. I had also noticed
the
> Scopemeter was showing a
peak og 13.6V when the gate and drain
>
waveforms were spiky, and now that was back to the normal
12.4
> or so volts.
>
> Finally.my question.
Why would a poor or high
resistance
> connection on
the vertical section of the antenna affect
the
> gate waveforms? I think I can
see why the drains were affected,
>
but why the gates, and why the higher volts on the
Scopematch
> traces?
Thanks, I like to try and find out WHY things
have
> happened,
even after fixing them, so I
appreciate any
> instruction
here. I attach links to the normal gate and
drain
> waveforms and a second link to
how they were last night. Amp is
> voltage
mode Class D.
>
> Normal:
http://www.gatesgarth.com/normal.jpg
>
> Last night :
http://www.gatesgarth.com/spiky.jpg
>
> --
> Best
regards,
>
Chris
mailto:
[email protected]>
>
