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Re: LF: Poor aerial connection affecting gate waveforms??

To: <[email protected]>
Subject: Re: LF: Poor aerial connection affecting gate waveforms??
From: "Graham" <[email protected]>
Date: Sat, 15 Apr 2017 14:14:17 +0100
Importance: Normal
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Chris,
 
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
 
How important  are the  wave forms ?
 
73-G,

2017-04-15 06:15:22 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -43 Op32__~43dB
2017-04-15 05:25:22 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -44 Op32__~44dB
2017-04-15 04:35:22 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -34 Op32_||||||||_~34dB
2017-04-15 03:45:20 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -30 Op32_||||||||||||||_~31dB
2017-04-15 02:55:22 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -33 Op32_||||||||||_~33dB
2017-04-15 02:05:20 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -34 Op32_||||||||_~34dB
2017-04-15 01:15:20 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -32 Op32_||||||||||||_~32dB
2017-04-14 23:35:23 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -42 Op32__~42dB
2017-04-14 22:45:21 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -33 Op32_||||||||||_~33dB
2017-04-14 21:55:22 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -38 Op32__~39dB
2017-04-14 06:05:21 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -36 Op32_||||_~36dB
2017-04-14 04:25:22 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -44 Op32__~44dB
2017-04-14 03:35:21 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -38 Op32__~38dB
2017-04-14 02:45:21 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -35 Op32_||||_~36dB
2017-04-14 01:55:21 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -36 Op32_||||_~36dB
2017-04-14 01:05:21 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -38 Op32__~38dB
2017-04-13 23:25:22 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -40 Op32__~40dB
2017-04-13 22:35:22 2E0ILY IO82QV SV8RV-10 KM07KS 2.469 136 -41 Op32__~41dB
 
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]
>
>

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