[R-390] test equipment question

Sun Feb 15 15:04:42 EST 2009

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
>
> 


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