Joel,
Seems to me awhile back someone said problems with
their (minor?) loop board causing spurs, and the usual
resolder job took care of it. I tried a search and
couldn't find anything, nor can I recall if they
mentioned the nature of their spurs. Hope I'm not
just spreading mis-information - but - that is what I
recall. The power connectors are known to get flaky,
so hopefully that solved it. Let us know if you run
into anything else...I think there are quite a few of
us lurking out here that have Paragons!
73, Mark N8COO
n8coo at yahoo dot com
> Subject: Re: [TenTec] Paragon Problem -spurs on
> either side of carrier
> Date: Sun, 28 Jan 2007 18:48:27 -0800
> To: "Discussion of Ten-Tec Equipment"
> <tentec@contesting.com>
>
> Hi Joel,
>
> You'll notice from the pictures on the link I
> posted that the spur
> content was a function of frequency as you might
> expect from
> a multi-loop synthesizer. You might want to check
> several
> different frequencies just to be sure you everything
> is okay,
> especially if you weren't careful to use same exact
> frequency
> for your before and after tests.
>
> Mike W4EF...................
>
> ----- Original Message -----
> From: "joel hallas" <jrhallas@optonline.net>
> To: "Discussion of Ten-Tec Equipment"
> <tentec@contesting.com>
> Sent: Sunday, January 28, 2007 1:22 PM
> Subject: Re: [TenTec] Paragon Problem -spurs on
> either side of carrier
>
>
> > 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..........................................
> >>
> >>
> >>_______________________________________________
> >>TenTec mailing list
> >>TenTec@contesting.com
>
>>http://lists.contesting.com/mailman/listinfo/tentec
> >>
> >>
> >>
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> >
> http://lists.contesting.com/mailman/listinfo/tentec
> >
>
>
>
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