[Test-Equipment] Fwd: Re: [Mw] Fwd: Re: Mega-mode Sr.?

[Mike Manes]

Here's some info from K0CQ on the uW reflector. Might want to
contact him directly if you're interested in putting it into
service.
73 de Mike W5VSI

-------- Original Message --------
Subject: Re: [Mw] Fwd: Re: [Test-Equipment] Mega-mode Sr.?
Date: Fri, 05 Nov 2010 11:06:55 -0600
From: Dr. Gerald N. Johnson <geraldj at weather.net>
Reply-To: geraldj at weather.net
To: microwave at lists.valinet.com

I've had one of those for decades. I believe I have the manual for it.
It uses a coaxial diode so should avoid the resonance problems of the
5722 and similar diodes used in HP NF heads. I found the termination was
based on magnetically biased ferrites because it has to pass tube
current, not simple wide band disk resistors and I've not used it
because those ferrites were messed up. I had a thought of changing the
termination to fans or disks of composition resistors, like 6 300 ohm in
parallel, maybe set up as attenuators. If the termination was broad band
and a good match to 50 ohms, it might be useful beyond 1 GHz as it was
rated.

I've not used it, though I've had it on the bench for a while trying to
improve the termination. In the event the emission of the filament gets
used up, replacement is probably truly impossible. And the coaxial tube
is crucial to the design.

I looked for ten minutes and the manual didn't show up where I expected
it. But many manuals are in boxes since I'm nearing the end of moving
out of the old place where I stayed nearly 40 years.

73, Jerry, K0CQ

On 11/5/2010 8:27 AM, Mike Manes wrote:
> This came over the test equipment reflector.  Might be useful for
> some UHF+ NF testing, although it's HUGE - I'll pass.
> 73 de Mike W5VSI
>
> -------- Original Message --------
> Subject: Re: [Test-Equipment] Mega-mode Sr.?
> Date: Fri, 5 Nov 2010 08:28:48 -0500
> From: Barry Sherwood <ars.kf5gc at gmail.com>
> Reply-To: Discussion of Electronic Test Equipment
> <test-equipment at mailman.qth.net>
> To: Discussion of Electronic Test Equipment
> <test-equipment at mailman.qth.net>
>
> Nice case and panel, I see great potential for another project of sorts.
> Good find even if you don't need a noise generator for your testing
> purposes.
>
> On Fri, Nov 5, 2010 at 8:13 AM, Mike Sloane <mikesloane at verizon.net> wrote:
>
>> I rescued this from the dumpster - the woman told me that it was in her
>> grandmother's house when they were cleaning it out. I have no idea what
>> it is, aside from being a "noise generator". As noted in the image
>> referenced below, it was made by Kay Electronics in Pine Brook NJ (not
>> far from Boonton NJ, home of Boonton Electronics and Aircraft Radio,
>> etc.). I am not likely to even turn it on, as I don't know the condition
>> of the internals. BAMA came up empty, and I certainly am not going to
>> pay $25 for a manual for a boat anchor like this unless it is useful for
>> something.
>>
>> <
>> http://public.fotki.com/mikesloane/old-electronics-and/kay-electric-mega.html
>>
>> >
>>
>> Any (constructive) comments would be appreciated,
>>
>> Mike
>> ______________________________________________________________
>>
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