To: rsgb_lf_group@blacksheep.org
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From: N1BUG <paul@n1bug.com>
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Message-ID: <29372bf3-10de-f700-9dd9-2950ce9fd2c7@n1bug.com>
Date: Tue, 20 Nov 2018 09:50:14 -0500
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In-Reply-To: <456869353.20181120140404@gmail.com>
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Subject: Re: LF: WSPR-15 last night
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Reply-To: rsgb_lf_group@blacksheep.org

Oh, forgot to say congrats on being heard by W3SZ!

I believe you are correct about the U3S being only able to use one
call sign on WSPR.

73,
Paul


On 11/20/18 9:04 AM, Chris Wilson wrote:
> 
> 
> Hello N1BUG,
> 
> When I have blown a FET on Jay's amp design and replaced it / them I
> have sometimes seen less than optimal gate and drain waveforms from
> the replaced FET's. A simple meter "diode test" on the parallelled
> diodes / 10 Ohm resistors showed the diodes to be OK, but changing
> them restored things to a good pattern. i now change them as a matter
> of course if a FET blows. My matching transformer is a multi tapped
> primary / secondary pairing on three individually Kapton taped 77
> material 240 size cores stacked together. I see no heating t full
> power WSPR15 or Opera but they are in a sealed plasic box of more than
> generous size. I *HAVE* had issues with the ground terminals on the N
> type connector screws arcing although they appeared tight. I now
> solder direct to the socket flanges before mounting with the socket's
> flanges on the inside of the box. Hope you get it sorted soon, a box
> of spare FET's is a necessity, "things `appen" ;)
> 
> The only thing that gets warm is the LPF, it's in three divorced
> compartments like Jay's and i think yours? I use a small PC processor
> fan on the middle box with an exit hole meshed over opposite the fan.
> Air flow is adequate to keep all three toroids near ambient with this.
> I do see a mismatch s things warm up and the vario needs a tweak after
> a cold start. The loading coil becomes tepid after a while.
> 
> I was very pleased to be heard by W3SZ three times last night! I have
> discovered a limitation in only being able to have one call sign with
> the U3S which makes divorcing WSP2 and WSPR15 TX's on the reporter map
> impossible unless there's another option?
> 
> Tuesday, November 20, 2018, 10:54:15 AM, you wrote:
> 
>> Hi Stefan, LF
> 
>> I see some very interesting reporters on that list. :-)
> 
>> I would like to transmit as well, but the PA is not repaired. I must
>> look into it to see if anything in addition to the FETs is dead,
>> then order FETs and whatever other parts...
> 
>> When the PA is repaired I need to do some more testing before I try
>> WSPR-15. During every WSPR-2 TX period, the scopematch shows the
>> resistance of the antenna decreasing during the transmission. I am
>> worried this is caused by something heating. Maybe the ferrite in
>> the antenna matching transformer, maybe the the big coil? Or maybe
>> it is in the scopematch detector itself but that would be a little
>> difficult to believe. I would like to find the cause of this before
>> transmitting the long WSPOR-15 periods.
> 
>> I just woke up and sent the rest of my overnight spots to WSPRnet:
>> DK7FC and DF6NM.
> 
>> 73,
>> Paul
> 
> 
> 
> 
> 

-- 
Paul
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