#114868

Hi all,
I am making myself some field-notes for the FT-817, referencing the existing cheat sheets and the manual.

On page 20 of the operating manual:

"If your transceiver is configured for "RF Gain" use, rotating this control fully clockwise in
the SSB/CW/Digital modes will provide best sensitivity. To reduce the receiver's RF Gain
somewhat, rotate this control counter-clockwise slightly. You will observe an increasing
number of bars on the S-meter as you rotate the SQL/RF control counter-clockwise; this
indicates increasing AGC voltage, which is causing the front-end gain to be reduced."

I am presently confused, as I would expect the S-meter to be more active with the RF gain increased, but the way this is written (and in my experience), the S-meter decreases when the RF gain is increased. This also reduces the relevance of an RST based on reading the S-meter.

Am I misreading things?

73

#114869

开云体育

Yes.

On 6/1/24 10:33, Tobias KK7BCO/2M0TFF wrote:

Show quoted text

Am I misreading things?

#114870

开云体育

Hi Tobias,

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Re-read the second word of the second sentence. It says to REDUCE the gain, not increase it as the control is rotated CCW.

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So, what is being said is exactly correct.

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The way that the RF gain control works is to increase the AGC voltage, which reduces the gain of the controlled stage(s). As the S meter is simply a voltmeter on the AGC line, it shows a higher reading as the gain is reduced

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73….Eric VK2VE.

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Show quoted text

From: [email protected] <[email protected]> On Behalf Of Tobias KK7BCO/2M0TFF
Sent: Sunday, June 2, 2024 12:34 AM
To: [email protected]
Subject: [ft817] RF Gain and the S-meter

?

Hi all,
I am making myself some field-notes for the FT-817, referencing the existing cheat sheets and the manual.

On page 20 of the operating manual:

"If your transceiver is configured for "RF Gain" use, rotating this control fully clockwise in
the SSB/CW/Digital modes will provide best sensitivity. To reduce the receiver's RF Gain
somewhat, rotate this control counter-clockwise slightly. You will observe an increasing
number of bars on the S-meter as you rotate the SQL/RF control counter-clockwise; this
indicates increasing AGC voltage, which is causing the front-end gain to be reduced."

I am presently confused, as I would expect the S-meter to be more active with the RF gain increased, but the way this is written (and in my experience), the S-meter decreases when the RF gain is increased. This also reduces the relevance of an RST based on reading the S-meter.

Am I misreading things?

73

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