Jim es Co
I have made no effort so far to investigate the problem since I do not use
Opera much. I do have plenty of decoupling both in the OSC/DIVIDER stages
also the LT es HT supplies to the TX MODULE.
I have several cables running into the shack from various antennas which are
quite a distance away and it could well be that one is picking up the RF
even at a vy low level and leaking it into the modem.
The modem recovers quickly after a transmission but seemingly not quick
enough to get a result from the database. It looks like this needs an
immediate response during transmission or immediately afterwards. It means I
cannot see who has copied my transmission when I stop.
I did think of putting the divider es driver into a screened box with all
power leads going to es from decoupled. That might cure it. The osc running
at 5 Mhz (Kenwood VFO 520) is in a screened box and not a problem.
73 de mal/g3kev
----- Original Message -----
From: "James Moritz" <[email protected]>
To: <[email protected]>
Sent: Sunday, February 19, 2012 1:48 PM
Subject: Re: LF: opera 500
> Dear Mal, LF Group,
>
> If the internet connection falls over when only the PA driver is operating
> as you descibed, the modem must be extraordinarily EMI-sensitive. I would
> suspect there is some problem with cabling and/or decoupling of the TX in
> order to cause this kind of failure. Since Opera is just a variant of QRSS
> as far as the radiated signal goes, you would certainly expect similar
> behaviour when transmitting QRSS. But you don't seem to have much trouble
> downloading pictures of your QRSS signal from all the various grabbers and
> uploading them to this reflector, so I wonder if the problem really is RF
> related?
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
>
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