[R-390] TEST EQUIPMENT RECOMMENDATION

[Jon Schlegel]

Hi Harold,

I guess the next item I'd add would be a signal generator.  For 
general receiver work you really need a generator that's stable, RF 
tight and with a correctly operating attenuator.  There is nothing 
more perturbing than setting the attenuator to max and having the 
receiver under test still responding to the generator signal due to 
the RF it is "spraying" or leaking around the attenuator.

My personal favorite sig gen is the HP 8640B but it's not vacuum tube 
and is prone to an aging problem of nylon gear 
breakage.  Nevertheless the 8640B is reasonably easy to work on and 
with patience, the broken gears are typically fixable.

I know that there are other common vacuum tube generators that will 
fit the bill but I'm not really up to speed on what's 
available.  Perhaps others on the list can help out there.

Regards,
Jon Schlegel, WA3MVM



At 06:13 PM 1/25/2008 -0500, you wrote:
>I would appreciate knowing what The List Recommends in order to do a 
>good an accurate job of electrical restoration and maintenence (Not 
>physical restoration). My collection includes an R-390A, a dozen 
>pieces of Collins S-Line and some E.F Johnson.
>
>I probably have little more test equipment than what the average Ham 
>has; good VOM, VTVM, Scope and a few pieces of HeathKit.
>
>Since I am only working on my own equipment, I don't want to move to 
>the level of A Service Monitor, etc. Perhaps the Tube Type would be 
>best as i could fix it if it breaks. Models and Manufacturer would be great.
>
>All recommendations graciously accepted.
>
>Harold
>
>
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