In the old versions, although the S meter still operated from S0, with the
RF gain was reduced, the S meter dropped in value and was always wrong for
all signals. With the new RF gain S meter interaction, the S meter is
always correct if the signal is above the RF gain setting. If the signal is
below the RF gain setting, it would be in the noise assuming you had
adjusted RF gain for the point where the noise was just present.
Carl Moreschi N4PY
121 Little Bell Drive
Hays, NC 28635
----- Original Message -----
From: "Toby Pennington" <email@example.com>
To: "Discussion of Ten-Tec Equipment" <firstname.lastname@example.org>
Sent: Thursday, February 09, 2006 1:41 PM
Subject: Re: [TenTec] S-meter and RF Gain
> Bill, I have seen these comments or arguments before about the RF gain
> s meter, and I never had any problems setting the RF gain or threshold,
> fact I use an old version of the firmware 1.367 where I have to use the
> threshold and RF gain seperately. I use this version because the sweep
> very real time and the firmware seems to be stable for me.
> However, with the RF gain reduction increasing the s meter in 2.0 and O2,
> I have to increase the RF gain to give a s meter reading.
> With the 1.xxx versions the s meter is always active and real time and
> to give a report. A lot of this has to do with the way a person operates
> his rig and his own preferences. I would prefer to have the s meter active
> regardless of RF gain setting.
> AS far as the antique receivers are concerned, their day has passed and
> maybe it is time for a change concerning this issue.
> Toby W4CAK
> ----- Original Message -----
> From: "Bill Tippett" <email@example.com>
> To: <firstname.lastname@example.org>
> Sent: Thursday, February 09, 2006 12:48 PM
> Subject: [TenTec] S-meter and RF Gain
> > W4CAK:
> > >Alas, both the O2 and the 2.0 firmware for the old Orion have the s
> > working like it does in the foreign imports. The lower the RF gain the
> > higher the s meter will be stuck.
> > >Change is inevitable, but don't like this one.
> > Toby, you mean you don't like Collins,Hammarlund,
> > Hallicrafters, Drake, etc? It's
> > how S-meters and RF Gain controls have worked
> > for at least 60 years! This wasn't invented
> > by "foreign imports", it's simply the result
> > of how the S-meter interacted with RF Gain
> > in analog rigs.
> > The "change" was when Ten-Tec decoupled
> > the two in Orion. I feel this will make it
> > much easier for people to set RF Gain correctly
> > (the same ones who now complain about Orion
> > being "noisy" because they don't know how to
> > set RF Gain properly). Instead of setting Gain
> > by ear, now they can set it by simply adjusting
> > the S-meter deflection to be slightly above
> > noise peaks. What could be simpler?
> > Actually Sinisa YT1NT first suggested
> > this in his March 2004 white paper when so
> > many folks could not figure out how to set
> > AGC Threshold correctly. I think this is
> > actually a good move making Orion much easier
> > to use.
> > 73, Bill W4ZV
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