[R-390] test equipment question

Sun Feb 15 15:07:32 EST 2009

Yep, the SAME problem here!  I type with the "Columbus Method", seek 
out, land upon AND discover!  <LOL>

I'm one of the old FA*%s  also!

Bob - N0DGN

Patrick wrote:
> Sorry, meant 2KCS to 34MCS, that is what happens when you are an old 
> FA*%.
> ----- Original Message ----- From: "rbethman" <rbethman at comcast.net>
> To: <r-390 at mailman.qth.net>
> Cc: "Patrick" <brookbank at triad.rr.com>; "Cecil Acuff" 
> <chacuff at cableone.net>; "Tisha Hayes" <tisha.hayes at gmail.com>
> Sent: Sunday, February 15, 2009 3:00 PM
> Subject: Re: [R-390] test equipment question
>
>
>> I guess I'm STILL in the dark ages!  from 2 to 34 Mc doesn't cover 
>> the IF.
>>
>> I do NOT require an HP-8640B just to replace either the URM-25 NOR 
>> the GR-1001A.
>>
>> The B&K Frequency counter does fin, have an HP-410B (or C - don't 
>> remember at THIS moment), ant a TS-505D/U.
>>
>> Old Tek scope that I can use to ensure the 455Kc IF isn't over done 
>> and distorted.
>>
>> I have difficulties understanding the NECESSITY for all this NEW test 
>> equipment for this OLD '50s radio.
>>
>> Cecil, tell me you NEVER used this old gear to setup an R-390 or R-390A!
>>
>> Just another opinion of an old goat!
>>
>> Bob - N0DGN
>>
>> Patrick wrote:
>>> To me, the best Frequency Generator that I have is a 0-464/SRC 
>>> Synthesizer Electrical Frequency. works from 2 to 34 MCS, is solid a 
>>> a rock and plenty of adjustable power to use with a small antenna. A 
>>> little big a heavy (rack mountable) but very reliable. The other one 
>>> is an old tube one, a Hampden HBT 477 that has a Xtal socket, perfet 
>>> for testing crystals. Anyhow, only the opinion of and old FA%&.
>>>
>>>     ----- Original Message -----
>>>     *From:* Cecil Acuff <mailto:chacuff at cableone.net>
>>>     *To:* Tisha Hayes <mailto:tisha.hayes at gmail.com> ;
>>>     r-390 at mailman.qth.net <mailto:r-390 at mailman.qth.net>
>>>     *Sent:* Friday, February 13, 2009 1:22 PM
>>>     *Subject:* Re: [R-390] test equipment question
>>>
>>>     Actually a good HP-8640B can be had on ebay for fairly
>>>     cheap....don't go to Fair Radio though...not the place to buy test
>>>     gear....except maybe scopes. The 8640B is an analog sig gen but 
>>> has a lock feature that will
>>>     lock it down to the dialed up freq so no problems with drift.  I
>>>     would imagine a working example could be had for less than $400.
>>>      I didn't like the URM-25 either and got rid of it quickly....  The
>>>     HP-606A and a freq counter was a better solution and then I added
>>>     the 8640...
>>>      Cecil...
>>>
>>>         ----- Original Message -----
>>>         *From:* Tisha Hayes <mailto:tisha.hayes at gmail.com>
>>>         *To:* r-390 at mailman.qth.net <mailto:r-390 at mailman.qth.net>
>>>         *Sent:* Friday, February 13, 2009 11:55 AM
>>>         *Subject:* Re: [R-390] test equipment question
>>>
>>>         I know that this is broaching on heresy to mention this;
>>>
>>>         I found the URM-25D to be less than helpful when compared to a
>>>         good signal generator. It is drifty, the impedance matching
>>>         module is a joke and it is hard to get repeatable results when
>>>         trying to chase the performance dragon.
>>>
>>>         But; if you use a good frequency reference (like the 100 KHz
>>>         calibrator and that is not waay off and WWV) you can get
>>>         darned close to being on frequency.
>>>
>>>         If you dare to dabble with the compensation screws on the PTO
>>>         to correct linearity you need a much better frequency counter
>>>         and signal generator. Of course, gettting used HP/Agilent
>>>         equipment will cost you more than any one radio would ever
>>>         sell for. You can find a really decent HP 400 series VTVM or a
>>>         Boonton that would do an excellent job on measuring RF levels
>>>         for a song-and-a-dance.
>>>
>>>         The original maintenance manuals were written around the
>>>         inherent limitations of the test equipment available at the
>>>         time (URM-25's). While I try to keep the filaments glowing and
>>>         avoid transistor/IC based radios in my setup I do use more
>>>         modern test equipment.
>>>
>>>         
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>>
>> -- 
>> Bob - NØDGN
>>
>>
>
>

-- 
Bob - NØDGN