You are most welcome. Glad to be of assistance.
73
Bob, K4TAX
----- Original Message -----
From: "Henry Mackey" <kb9cqo@embarqmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, February 02, 2008 1:24 PM
Subject: Re: [TenTec] Digital (PSK31) Communications
> Hello group,
>
> Thank you Bob/K4TAX. You said what I was trying to say in both of your
> recent emails. Someone on the waterfall told me how to adjust my system,
> and then gave me a report.
>
> I too watch the list for info that catches my interest. Thanks to those
> that provide.
>
> 73 de Henry/n9hm
>
>
> ----- Original Message -----
> From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Saturday, February 2, 2008 12:41:08 PM (GMT-0500) America/New_York
> Subject: Re: [TenTec] Digital (PSK31) Communications
>
> Agreed. If the ALC light blinks either you have too much mic gain or too
> much signal from the sound card. There should be NO ALC action for a good
> clean PSK-31 signal.
>
> With Tentec radios, when properly adjusted and with the correct level from
> the sound card, you should receive IMD reports during idle from the other
> station in the order of -25 to -30 dB. If your IMD is higher than this,
> i.e. -20 to - 10 dB, then you have too much signal from the sound card or
> you are operating the transmitter at too high of power output.
>
> If you are not sure, ask a station that you are in contact with to give
> you
> an IMD report. To do this you must not transmit data, just let the system
> idle without typing for 10 to 20 secs. Have the other station let the
> software on the receiving end provide you a signal report. If your IMD is
> high, then reduce the level from the soundcard or the interface device
> that
> you are using.
>
> For a 100 watt radio, your power output should be 25 to 35 watts. It all
> cases it is normal to have the radio set so that it is capable of
> producing
> 100 watts of output. However, it should be driven with level from the
> sound
> card so as to produce no more than 25 to 35 watts of actual power. Do not
> turn radio power down. Turn sound card level down.
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message -----
> From: "KXB" <w7kxb@msn.com>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Saturday, February 02, 2008 11:28 AM
> Subject: Re: [TenTec] Digital (PSK31) Communications
>
>
> Hello Herve
> In psk, "DO NOT BLINK THE LIGHT" period
> Carry-on
> Bill Harris w7kxb
> ----- Original Message -----
> From: F8EHJ<mailto:f8ehj@free.fr>
> To: Discussion of Ten-Tec Equipment<mailto:tentec@contesting.com>
> Sent: Saturday, February 02, 2008 8:49 AM
> Subject: Re: [TenTec] Digital (PSK31) Communications
>
>
> Hello,
>
> I subscribe to this list for this reason :
> What is the adjustement for PSK31 using a Ten tec jupiter.
>
> I am agree with you that ALC indicator should not be always lighted.
> So I adjust sound card output level to have ALC led blinking with
> modulation.
>
> But what about MIC GAIN ? I selected in the menu line mic for input.
>
> There is a relation between MIC GAIN, ALC and RF OUTPUT !
>
> If I decrease RF POWER I must decrease MIC GAIN to have ALC blinking.
> (or I must decrease sound card OUTPUT LEVEL.
>
> Thanks for explain.
>
> best 73's
>
> Herve F8EHJ
>
> TENTEC JUPITER 538
> MICROPHONE 706 DESK
>
>
> Le 2 fÃvr. 08 Ã 17:38, Bob McGraw - K4TAX a Ãcrit :
>
> > A comment to the point of setting vs. controlling the power on the
> > Jupiter.
> >
> > For modes like PSK-31 the Jupiter should be configured to operate
> > at its
> > rated output power or 100 watts. Then the actual power output
> > should be
> > controlled by the PSK-31 software or the sound card output level or
> > interface output level to the Jupiter so as to cause the Jupiter to
> > produce
> > some 25 to 35 watts of power. This will prevent the ALC activation
> > and
> > subsequent distortion from being generated and transmitted. Also,
> > any SP or
> > speech processing should be OFF.
> >
> > It should be noted that the PSK-31 signal will cause the power
> > output to
> > vary slightly depending on if idle or data is being transmitted.
> > This is
> > normal and the amount of variation depends on several factors, such
> > as tone
> > frequency, power meter response and dampening and etc.
> >
> > Here is the basic NO NO. Reduction of the Jupiter power to 25 to
> > 35 watts
> > and then have the sound card audio drive the Jupiter to 25 to 35
> > watts will
> > activate the ALC and subsequent distortion of the transmitted
> > signal will
> > likely result. This produces a transmitted signal that is several
> > hundred
> > Hz wide and thus an annoyance or interference to others on the band.
> >
> > In general it is frowned upon to run "high power" on PSK-31. The
> > issue with
> > this lies in the fact that an exceptionally strong signal adjacent
> > to a weak
> > signal, both within the IF passband, will cause the strong signal to
> > capture the AGC and thus further suppress the weaker signal. As a
> > general
> > "rule of thumb" one should always operate with actual PSK-31 power
> > output
> > being no more than 25% to 35% of the rated transmitter power.
> >
> > 73
> > Bob, K4TAX
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "ron" <roncasa@verizon.net<mailto:roncasa@verizon.net>>
> > To: "Discussion of Ten-Tec Equipment"
> <tentec@contesting.com<mailto:tentec@contesting.com>>
> > Sent: Saturday, February 02, 2008 9:42 AM
> > Subject: Re: [TenTec] Digital (PSK31) Communications
> >
> >
> >> Henry Mackey wrote:
> >>>
> >>> The power setting on the Jupiter was at 100%. However, I would
> >>> reduce
> >>> the power according to the rigs meter to 20-25 watts and avoid
> >>> any ALC.
> >>>
> >>>
> >>
> >>
> >> 25 watts??
> >>
> >> For a mode that only needs minimal wattage??
> >> Try less and be amazed. (the spectrum would also be cleaner if we
> >> all did)
> >> (smile)
> >>
> >> Ron
> >> "the 516 is a keeper"
> >> _______________________________________________
> >> TenTec mailing list
> >> TenTec@contesting.com<mailto:TenTec@contesting.com>
> >>
> http://lists.contesting.com/mailman/listinfo/tentec<http://lists.contesting.com/mailman/listinfo/tentec>
> >>
> >
> >
> > _______________________________________________
> > TenTec mailing list
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> >
> http://lists.contesting.com/mailman/listinfo/tentec<http://lists.contesting.com/mailman/listinfo/tentec>
> >
>
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