Re: TinySA Ultra 50 Khz as a signal generator
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For the DMM (voltmeter) are you attaching to the DC level of the AGC or possibly the downconverted IF signal in the first IF?? The DMM will not see RF energy at the IF frequency.?
Also, most AGCs I've played with are at high impedance DC levels.? The DMM must present a high-Z in measuring the DC AGC voltage.
Just a few thoughts......
Dave - W?LEV
Something else to check is does the agc voltage change with the RF Gain control?
73
Jeff G8HUL
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From: [email protected] <[email protected]> on behalf of G8HUL via <g8hul=[email protected]>
Sent: Saturday, May 24, 2025 17:12
To: [email protected] <[email protected]>
Subject: Re: [tinysa] TinySA Ultra 50 Khz as a signal generator
?Does the agc voltage on the multi-meter change with the generator off?
I can only conclude from what the S meter is doing that the generator level is too high even at minimum, but that does not explain what you are seeing on the multi-meter, (assuming that the reading does not change between generator on and off).
73
Jeff G8HUL
________________________________________
From: [email protected] <[email protected]> on behalf of enriqueeeeee2001 via <enriqueeeeee2001=[email protected]>
Sent: Saturday, May 24, 2025 14:36
To: [email protected] <[email protected]>
Subject: Re: [tinysa] TinySA Ultra 50 Khz as a signal generator
Yes, I have checked several times that the signal is injected, I can heard the tone and adjust T17 for zero beat.The probe is in the correct location, although the manual indicates two white/green wires attached in the? 1st IF board, real ones are brown/white.?I attach a photo indicating the places where the voltmeter and generator are)?Now the S-meter goes down to scale (both tiny and HP).?Yes, the S-meter is at zero when the generator is off?I have also checked that neither external antenna is connected nor rx tuned a strong station.[X]
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