12-11-2023, 07:52 AM
Hmmm...
Other radio or radios work fine in the same environment?
Does the freq indicated on the transmitter match the frequency on the radio's dial?
Is there background noise when receiving your AM Transmitter. Does the radio become noisy when left at that freq and the transmitter is turned off?
Is your AM transmitter received broadly on the receiver in question, or only at the freq indicated on the receive dial?
The schematic shows a cap, C19, 0.047 uF across the power line to filter power line noise. check / change this cap with a safety type.
The schematic shows a tunable LC network and switch (S2) in the input of the converter, ganged to another coil in the oscillator which serves as a wave trap (?). Try to set switch so that this network is out of the circuit.
Check / change C3, the 725pF cap that connects the loop antenna to the converter input. It is likely mica. They usually do not fail, but very occasionally, they do.
I worked on one of these as a kid. The voltage doubler rectifier allows greater power out of the 35L6. This plus the 8" speaker makes this a nice sounding set.
Other radio or radios work fine in the same environment?
Does the freq indicated on the transmitter match the frequency on the radio's dial?
Is there background noise when receiving your AM Transmitter. Does the radio become noisy when left at that freq and the transmitter is turned off?
Is your AM transmitter received broadly on the receiver in question, or only at the freq indicated on the receive dial?
The schematic shows a cap, C19, 0.047 uF across the power line to filter power line noise. check / change this cap with a safety type.
The schematic shows a tunable LC network and switch (S2) in the input of the converter, ganged to another coil in the oscillator which serves as a wave trap (?). Try to set switch so that this network is out of the circuit.
Check / change C3, the 725pF cap that connects the loop antenna to the converter input. It is likely mica. They usually do not fail, but very occasionally, they do.
I worked on one of these as a kid. The voltage doubler rectifier allows greater power out of the 35L6. This plus the 8" speaker makes this a nice sounding set.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
