does any one have any info about these wiring code it has a yellow wire coming out with the coax for the crystal any one know what the yellow wire is for ?
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maco vfo
- Thread starter shadygrady
- Start date
Does this one say "27.300" on the rear panel?
The yellow wire is a keying wire. That VFO is meant for a radio that uses one crystal for each transmit channel. The transmit crystal operates on the frequency that you're receiving. Can't have the VFO pushing out a carrier while you're trying to receive. Would be like having the "spot" button pushed in all the time. The yellow wire is meant to be connected to the transmit pin inside the mike socket. When the yellow wire is grounded the VFO pumps out a carrier. And when you let off the mike the VFO stays on standby. This is why there is a knob marked "spot" on the VFO. Lets you line up the receiver dial by activating the VFO alone.
73
The yellow wire is a keying wire. That VFO is meant for a radio that uses one crystal for each transmit channel. The transmit crystal operates on the frequency that you're receiving. Can't have the VFO pushing out a carrier while you're trying to receive. Would be like having the "spot" button pushed in all the time. The yellow wire is meant to be connected to the transmit pin inside the mike socket. When the yellow wire is grounded the VFO pumps out a carrier. And when you let off the mike the VFO stays on standby. This is why there is a knob marked "spot" on the VFO. Lets you line up the receiver dial by activating the VFO alone.
73
no it has 5mhz 6 mhz 7.5mhz 14.5mhz we have 4 different vfos just need some info for them any will help get started
The 5 MHz is meant for the Browning Mark 3 SSB transmitter. It takes the place of a 5 MHz crystal that's always selected and moves the coverage of the radio's 23-channel selector up and down in frequency. Just one problem. The circuit where it feeds in is narrow-banded and the power tends to drop off going up or down in frequency. A fatal flaw, IMHO.
Thought sure we had some info on file about the 6 and 7.5 MHz, but I haven't found it. Don't remember a "14.5". Only a "13.5".
I think. The search will continue. Has to be here somewhere.
73
Thought sure we had some info on file about the 6 and 7.5 MHz, but I haven't found it. Don't remember a "14.5". Only a "13.5".
I think. The search will continue. Has to be here somewhere.
73
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@ Geoexplorer69:Coax question. I just put up a new Sirio monsoon base antenna with 100’ of rg8u coax testing with myMFJ antenna analyzer shows 1.4 swr at 26.965mhz and a 1.1 at 27.405 mhz . When I checked the ohms it’s steady a 30 ohms across the entire bandwidth.
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