I'm intrigued by your query about the OMNI-V J310's. I have an OMNI-V
and its now quite ancient. Are there any symptoms associated with
J310 ageing ?? I feel, but cannot verify, that I've recently been
getting more intermod than I used to get when the rig was newer,
especially on 40m. Could be that the European QRM is a lot louder now
I use ladder line instead of 100ft of coax, but it has occurred to
me that I might also have a front end problem developing. The front
end sensitivity on the HF (20 and up) bands appears to be low,
although I can hear signals way down to the antenna noise if I crank
up the RF gain. I cannot crank up the audio gain without getting
noise of the wrong sort - not from the antenna. (My RF gain is usually
well up, at 3-4 PM; audio stays down at 9-10 PM).
The J310 is easily obtainable here, but I'm not sure how to set about
matching a set of four. I think any replacement must use a well
matched set, or it will defeat the object of sharing the work load.
Incidentally, I replaced all the front end switching diodes with
locally obtained pin diodes (not necessarily the best ones for the
job - see recent comment on Paragon diode swap). This was before I
discovered the obvious - I had a stuck reed relay !! There was no
noticable performance improvement, even when I fixed the relay
(with the help of the TT service dept).
But I wonder if I should really be considering a complete re-alignment
(is there any info on that available ?) after so much heavy use.
73 John G3JAG
On 20-Jan-99 Steve Baron wrote:
>
> A few years ago I noticed that the voltage on a few of the J10's
> was
> significantly lower (0.5 to 1 V) than the others which were up
> around 1.5
> (1.7 ?) or so. Replaced some and all were 'balanced'.
>
> Recently had the covers off and checked them again and saw that a
> few had
> dropped again.
>
> Would appreciate any input on the effect of reduced voltage - and
> perhaps a
> number for the lowest that should be tolerated.
>
> Thanks.
>
>
>
> --
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----------------------------------
E-Mail: patents@dx0man.prestel.co.uk
To: <tentec@contesting.com>
Date: 22-Jan-99
Time: 14:03:35
John Crux
Consultant in product forgery - Asia and
Africa
----------------------------------
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