[Moon] (no subject)

Tue Feb 23 06:58:44 CET 2021

Hej, Ingolf.

Today it's a national holiday here, the Emperor's birthday. So I have 
enough time to read your comment. 

Sometimes it would be difficult to clearly explain the cause and outcome. 
But at least it was good in your case that you didn't touch the 3kV inside. 

In my case first I didn't know the reason but found 12V line for LNA and 
T/R sequencer showed 3V only. So I had to replace it to something....

Fortunately I have a microphone amplifier and the phantom PS. Usually 
I don't have microphone in EME shack, but I used it during SSB Funtest recently. 
I could get regulated low noise 12V from it. And I have a Chinese 0.6dB 
34dB LNA in addition to the original LNA. Why not test it? 

It was a warm night and easy to work outside on a ladder of 2m high.
But no noise came into my RX... Why?  
Chinese LNA's power requirement is 5V, not 12V. 

So I had to remove it, and tested again HB FHX35LG(by JH0WJF) only. 
T/R sequencer worked normally then. 

Hope it works, but immediately after I connected 12V of phantom PS, to 
my setup, 48V line, several millimeters away in the DC connector, was 
touched on. 

This was the end of my night work of the contest night! 
Hope my phantom PS for SURE electret microphone did not break.... 

Mike JH1KRC 

---- "Ingolf wrote: 
> Hi Mike and all.
> 
> If it would be of any comfort to you, you are not the only one that had
> equipment trouble this weekend.
> 
> It has been some time since I was on 432 MHz EME. I have however been doing
> a lot of 432 MHz meteor scatter in between with the very same rig.
> I had made some maintenance to the rig trying to solve a problem that only
> showed up while running meteor scatter. I think I have solved it.
> I tested the rig Friday afternoon. RF power as expected  and good returns
> from the Moon. All just fine.
> 
> Saturday when starting up calling stations I got some really nasty QRN
> after each Tx-pass. I grumbled something about all the b...y junk people
> buy for 439 MHz etc. even so the few neigburghs I have at my remote QTH.
> Then I realized I had a sizzling noise from the direction of my PA or
> HV-PSU (3+ kV). The noise came after each Tx-pass and was in sync with the
> static noise in the Rx.
> I removed the HV cable from the HV-PSU to the PA but the noise remained. I
> concluded its origin was from the HV-PSU.
> I did not dare to continue operating in fear of a full blown arc in the
> HV-PSU, that might do even more damage.
> I managed to make 3 QSO's in the contest.
> 
> I think my HV-PSU has caught a coronavirus ;-)
> I have myself stayed away from the Covid, but clearly my HV-PSU was more
> susceptible to corona.
> 
> I have not yet dampened the light and looked into the 3-phase HV-PSU to see
> the corona glow. I hope it is some dust and not inside the 45 kg 3-phase 3+
> kV HV-transformer. It would not be easy to find a replacement for that one.
> 
> Why does the trouble manifest itself when it is contest time? Even if you
> try to check everything in advance for proper and stable operation.
> 
> 73 / Ingolf, SM6FHZ
> 
> 
> 
> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
> Virus-free.
> www.avg.com
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> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> 
> Den s?n 21 feb. 2021 kl 03:34 skrev M. Watanabe via Moon <
> moon at moonbounce.info>:
> 
> > Hello EME contesters,
> >
> > Unfortunately, I had many problems subsequently, I retired the
> > contest operation.
> >
> > After many years my modified two-band HPA began to work for
> > enough power output. Newly built loop feed was ready on the dish.
> > But it took too much time so I did not took part in NA window of
> > Saturday.
> >
> > In Eu window some DL5?? was heard clearly. LNA has a low NF, but it
> > was too calm. Why?  Maybe T/R sequencer had some trouble. I might
> > have transmitted into the LNA (even if I have an isolator that might help,
> > if it did not break up).
> >
> > Some other low voltage PS problems occured in the night, and so I
> > decided to stop contesting.
> >
> > Key words: Don't make it harsh. Be safe.
> >
> > TNX for your attention to me!
> > CU sometime on 70cm/23cm.
> >
> >
> > Mike JH1KRC
> >
> >
> > ---- "M. Watanabe via Moon" <moon at moonbounce.info> wrote:
> > > Hi 70cm CW enthusiasts (might be very little?),
> >
> > JH1KRC will hopefully be QRV on 70cm CW from 04 or little later
> > Saturday, 20 Feb. and Sunday also.
> >
> > After some ten years or so, this QRV is to commemorate our dearest
> > friend Kimio JA9BOH who became silent key last week.
> >
> > PSE try to pick me up for (almost all of) your # QSO.
> > TNX in advance,
> >
> > Mike JH1KRC
> >
> > 4.4m TVRO dish
> > Polar rotable loop feed
> > JH0WJF FHX35LG LNA
> > 1kW at TX
> >
> > _______________________________________________
> > Moon mailing list
> > Moon at moonbounce.info
> > /mailman/listinfo/moon
> >
> > Join eQSL.cc  https://eqsl.cc/qslcard/Index.cfm
> >
> > _______________________________________________
> > Moon mailing list
> > Moon at moonbounce.info
> > /mailman/listinfo/moon
> >
> > Join eQSL.cc  https://eqsl.cc/qslcard/Index.cfm
> 
> 
> 
> -- 
> Ingolf, SM6FHZ
> http://www.2ingandlin.se/SM6FHZ.htm