[Lowfer] Mid day MP

[Michael Sapp]

Mitch: Possibly. Always seemed like putting the "smoke" back in was more 
involved than letting it out.

http://i1296.photobucket.com/albums/ag19/wa3tts/5109prea_zpscbdca54c.jpg

With a 10 ohm emitter resistor I have 44ma @ 15 Volts B+ and a 10 ohm 
current limiter on the B+ to the xfmr side of

collector.   Only error was omitting that bridging wire across the bifilar 
windings. Did not take to long to figure out.

No time to put it on the SA right now, I'll save that for next session. I'll 
add the second 10 ohm resistor on the emitter in parallel

to see where the current  draw goes and eval if that heat sink is suitable 
for the task.....if it runs too hot I will put the transistor on the

top side of the board where more space and air circulation is available.....

73, Mike wa3tts


----- Original Message ----- 
From: "Mitch Powell" <ve3ot.mp at gmail.com>
To: "Discussion of the Lowfer (US, European, &amp, UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Friday, May 23, 2014 5:09 PM
Subject: Re: [Lowfer] Mid day MP


> Mike:
> You mean I have found another person who understands the "smoke theory" 
> for
> semiconductors ? My students have that problem - until it happens in a lab 
> !
> 73
> Mitch
>
>
> On Thu, May 22, 2014 at 10:08 PM, Michael Sapp <wa3tts at verizon.net> wrote:
>
>> Thanks Mitch: I could have been off  .1Hz or so. Lately I've been more
>> focused on signal levels than freq stability with the work-in-progress 
>> OCXO
>> and RAY-6 mixer combination.
>>
>> At least that 30/30 Argo setting seems to be a good balance for both MP
>> and EAR captures.
>>
>> Almost have a W1VD 2N5109 preamp finished. Any luck (no letting the smoke
>> out) I may have it operational this weekend....
>>
>> 73, Mike wa3tts
>>
>> ----- Original Message ----- From: "Mitch Powell" <ve3ot.mp at gmail.com>
>> To: "Discussion of the Lowfer (US, European, &amp, UK) and MedFer bands" 
>> <
>> lowfer at mailman.qth.net>
>> Sent: Thursday, May 22, 2014 9:48 PM
>>
>> Subject: Re: [Lowfer] Mid day MP
>>
>>
>>  Mike: thanks for the great shots - very nice and it gives me good input
>>> about the signal condition/frequency.
>>> John: Everything normal here - no change in DC input - and antenna 
>>> current
>>> almost right on the regular value - so must be Spring-time conditions. 
>>> But
>>> very nice to have some quiet band conditions. Thanks for the capture.
>>> 73
>>> Mitch
>>>
>>>
>>> On Tue, May 20, 2014 at 4:48 PM, JD <listread at lwca.org> wrote:
>>>
>>>  Here in EM27kc, MP didn't seem quite as strong as usual for some 
>>> reason,
>>>> but at least there was no noise this afternoon to speak of.  It was
>>>> almost
>>>> as quiet as mid-winter.  (Almost.)  Both 30 and 60 second Argo captures
>>>> attached; calibrated within 0.05 Hz at the end of the trace.
>>>>
>>>> John
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