[Lowfer] Mid day MP

Fri May 23 17:39:45 EDT 2014

Good thing you don't live in Denver, they might sell you something that 
could end

causing you to order extra pizzas....

Mike

----- Original Message ----- 
From: "Zack Widup" <w9sz.zack 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 5:35 PM
Subject: Re: [Lowfer] Mid day MP

>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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