[MRCA] Update April 26th PRC-47 no transmit

[Al Klase]

On 4/26/2018 12:01 PM, James Green wrote:
> ........The next item on the list is to put a signal into the antenna connector. The signal should be 2226 KHz at 2.0 microvolts. I am having a little difficulty stabilizing my signal generator on 2226 KHz and cannot figure out how to measure the 2.0 microvolts. When I measure the voltage of the signal using my fluke 177 meter, no matter how I set the output of the signal generator the reading decays to 1.7 microvolts RMS. When I measure the signal on my Tektronix TDS-210 O-scope the lowest volts/division my scope will measure at is 2.0 millivolts per division. I cannot seem to keep the signal together on the O-scope any lower than 2 units or 4 millivolts peak to peak. I am attenuating the signal with a 10 turn 200K pot into a .01uf cap.
>
> Any advice on how to set this up? Is this 2.0 uV supposed to be RMS or peak to peak?
>
> & O yes I may have bitten off more than I can chew, but I am nothing if not persistant. LOL
> ______________________________________________________________
>
James,

Lab-grade signal generators, like URM-25 or HP-606, measure the output 
of the generator itself with an internal meter, at a convenient level, 
say 1 volt RMS.  This know signal is applied to a calibrated attenuator 
on its way to the output jack.  I think, for your purposes you can just 
knock the generator output back to some reasonable level, 1-10 
millivolt'ish, and see if you can hear it.  I suspect the 2.0uV would 
enable a depot lab tech to verify full spec operation.  You just want it 
to work.

Good luck,
Al

-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/