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HR2510,

DavidD

New Member
May 10, 2022
8
2
3
77
Carrier on FM, AM, CW but no modulation on voice on any band, FM,AM,LSB,USB? Checked mic, seems okay, Power out good, just no modulation on voice tx.
 

Apply some audio to leg 2 of IC104 and come back with result.
Mike
hard to read my schematic but applied a 1kh tone at R85 which I think connects to IC104 pin2. Heard a very, very faint 1k tone in the speaker but did not see any modulation in the output
 
hard to read my schematic but applied a 1kh tone at R85 which I think connects to IC104 pin2. Heard a very, very faint 1k tone in the speaker but did not see any modulation in the output
WEAK AUDIO IN THE SPEAKER, NO MODULATION OF CARRIER
 
Apply some audio to leg 2 of IC104 and come back with result.
Mike
hard to read my schematic but applied a 1kh tone at R85 which I think connects to IC104 pin2. Heard a very, very faint 1k tone in the speaker but did not see any modulation in the output
 
applied tone but just week output. Put tone directly onto the mic input leads and got mod reading on the internal radio meter and onthe output
 

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