Mike,
Good observation, my Paragon gets very clicky much below about 12 V. I
am running it on a UPS system "12 V" AGM deep cycle battery and charger
(described in my QST article in Dec 03), along with a W4RRY Battery
Booster that keeps it at 13.8 V if I lose ac power, until the battery
drops to 10.5 (QST Oct 05)
Well, I went to measure, just to be sure, and everything was as expected
- voltage wise. What surprised me was that the problem has now gone
away. I would attribute it to contact resistance being cleaned up in the
measurement process - except that previously it had the same problem
with the TT ac supply and is now clean with that as well. I guess it
could have been contact resistance at the main power connector at the
back of the radio. Or the radio perhaps decided that it had tortured me
enuf! <g>
Thanks again & 73, Joel, W1ZR
Michael Tope wrote:
>----- Original Message -----
>From: "joel hallas" <jrhallas@optonline.net>
>
>
>
>>Folks,
>>
>>I seem to have a new problem with my Paragon. It transmits spurs 600 Hz
>>above and below the carrier about 10 to 20 dB down from the carrier.
>>This was reported to me by someone using the spectrum scope on an
>>SDR-1000. I have confirmed that at least one is there on another
>>receiver and the level seems about right. I can also notice the effect
>>on strong receive signals. I thought it was them <g>!
>>
>>I will put it on the spectrum analyzer at work next week, but wondered
>>if this is a known problem? I have done the "routine" things like
>>tighten all board screws and reseat all connectors and master reset.
>>
>>Any thoughts?
>>
>>Thanks!
>>
>>Joel Hallas, W1ZR
>>
>>
>
>
>Joel,
>
>What was the input voltage to the Paragon? I think it
>maybe sensitive to input voltage. Before I retired it,
>I ran mine off of a 13.8V supply and never had any
>complaints about my TX purity, nor did I notice any
>spurs on receive (-40dBc spurs would surely manifest
>reciprocal mixing products with strong signals which
>I never saw in practice). When I put it on a spectrum
>analyzer, however, it looked horrible:
>
>http://www.dellroy.com/W4EF's-Ham-Radio-Page/Paragon/paragon_tx_spectrum.htm
>
>I never resolved the discrepancy, but in thinking
>back, I may have carelessly run the spectrum
>analyzer test at 12.0V input instead of +13.8V.
>I know that my Omin 6+ just plain doesn't work
>at 12.0V (it needs +13.8V) and I suspect that
>the Paragon may have similar issues. I had intended
>to re-run the test with a variable supply, but I
>just haven't had the time (not much incentive since
>I am not using the Paragon currently).
>
>In any case, I would start with supply voltage
>and go from there.
>
>73, Mike W4EF..........................................
>
>
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