[TenTec] Power Line QRN?

[patents@dx0man.prestel.co.uk]

(i) my MFJ manual strongly advises against trying to run full QSK; it
recommends that you hitch the thing to the keyer output, so it goes
off line as fast as possible, but the time delay pot should NOT (say
MFJ) be set to give the fastest possible return time. Switching by RF
sensing is not actually the MFJ preferred method, although they do
provide it. (Its all in the manual).

(ii) the JPS device is rated well above the average transceiver 100w
output power and uses RF sensing to switch itself out of line. The
return time delay is fixed ... but can be shortened to around 7 ms by
an internal, JPS designed mod. (Its in the manual).

I think I'd take MFJs advice and stay with semi-QSK triggered by the
keyer output, not by RF. If they are not comfortable with their relay
following the keying, then I'm not comfortable with it either. As for
JPS, I am uneasy about RF switching because that means switching with
RF actually hitting the circuitry. Hot switching 100w of RF is usually
not very good news. But then I do not have the internal circuit of
the JPS box, so I do not know (or if) how they deal with the issue.
If anyone knows, then I'm sure we would all be interested.

John G3JAG
On 30-Apr-99 Robert Weingaertner wrote:
> 
> I've seen several MFJ recommendations in response to this
> question.Will
> the MFJ work in full break-in (QSK) mode? I think that the JPS has
> awitching delay, so it might only be useable in semi-breakin.
> 
>               73, Bob WB2VUF
> 
> 
> John B. Andrews wrote:
>> 
>> >A warning that this is a bit long-winded... please bear with
>> >me... I'm
>> >curious to get some feedback...
>> 
>> (snip)
>> 
>> I strongly suggest trying the MFJ noise cancelling unit...it has
>> worked
>> wonders at my site, which has electric trolly lines running about
>> 20 feet
>> from my shack, and other electrical noise sources.
>> 
>> John  KF6TJA
>> 
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E-Mail: patents@dx0man.prestel.co.uk
Date: 30-Apr-99
Time: 23:44:20

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