[Lowfer] Mid day MP

Fri May 23 17:35:07 EDT 2014

A while back I went into a smoke shop to see if they had any GaAsFET smoke
and all I got was a funny look. :-)

73, Zack W9SZ

On Fri, May 23, 2014 at 4:26 PM, Michael Sapp <wa3tts at verizon.net> wrote:

> 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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