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Galaxy 2547 Frequency Display
- Thread starter Recon
- Start date
Nope.
VC1 adjusts the radio's 10.24 MHz crystal. Unless you have an external counter to read that crystal's frequency, there's no need to molest VC1.
The counter lives on a tiny pc board behind the counter digits, if memory serves. There is a crystal on that board, and a tiny surface-mount trimmer cap next to it.
The only reason to tweak that adjustment would be if you have a calibrated external counter to compare the readings.
What kind of off-frequency problem are you trying to solve? Transmit? Receive? Both?
73
VC1 adjusts the radio's 10.24 MHz crystal. Unless you have an external counter to read that crystal's frequency, there's no need to molest VC1.
The counter lives on a tiny pc board behind the counter digits, if memory serves. There is a crystal on that board, and a tiny surface-mount trimmer cap next to it.
The only reason to tweak that adjustment would be if you have a calibrated external counter to compare the readings.
What kind of off-frequency problem are you trying to solve? Transmit? Receive? Both?
73
That radio has two trimmers labeled VC1. The through hole one in the PLL circuit and the surface mount one on the counter pcb behind the display. The radio gets aligned first, then the counter. If you are certain the radio is on frequency on all channels, then the smd trimmer VC1 on the counter board is what you want to adjust. Be careful, a little turn goes a long way. And those trimmers have a rotational life before they get loose and hard to keep on frequency, typically not more than 10 or 20 turns (listed in most datasheets), so don't play around.
