[R-390] test equipment question

[rbethman]

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