I have this Palomar 225 amp... has no labels... nothing to show antenna out and transceiver in...I have googled images and found several different ones...... some showing the exact opposite of the others....I did happen to find my board...... if anyone can tell me what the very left connector is.. would be great....
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Palomar 225 input/output
- Thread starter greusome1
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K7MEM
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Below is a link to an old Radio Reference discussion. It is about the same amplifier but with a bunch of hacks. The important part is the picture that shows three coaxial connectors on the rear panel. Two of which are wired together. This modification was commonly done to accommodate dual antennas. So, from that picture, ignoring the extra coaxial connector, you can deduce that the coaxial connector on the far left in "RF-Input" (Radio) and the coaxial connector in the center is "RF_Output" (Antenna).
http://forums.radioreference.com/cb-radio-forum/277468-palomar-225-amp-smoking-resistor-3.html
To further verify the connections, you should be able to follow the traces. On the left side of your picture are two relays. Above the relays is a carrier sense transistor (2N3904 or 2N3906, depending on the exact circuitry) that is used to switch from RX to TX. You should be able to follow the components from the "RF-Input" connector, through the relay, and to that transistor. One half of that relay switches the input and the other half switches the output.
The transistor below the relays is the receive pre-amp. The bottom relay is used to switch the pre-amp in and out. The transistor below the relays is the pre-amp transistor and is commonly a 2N2907. Again, you should be able to follow the traces and components to the transistor, relay, and front panel pre-amp switch.
The amp is also very similar to the Palomar Blue Lightning, with the exception that the Blue Lightning doesn't have a output filter. The output filter is that coil/capacator arrangement between the two coaxial connectors.
Note that to run that amp you will need a 12 Volt power supply that is capable of 25-30 Amps.
Martin - K7MEM
http://forums.radioreference.com/cb-radio-forum/277468-palomar-225-amp-smoking-resistor-3.html
To further verify the connections, you should be able to follow the traces. On the left side of your picture are two relays. Above the relays is a carrier sense transistor (2N3904 or 2N3906, depending on the exact circuitry) that is used to switch from RX to TX. You should be able to follow the components from the "RF-Input" connector, through the relay, and to that transistor. One half of that relay switches the input and the other half switches the output.
The transistor below the relays is the receive pre-amp. The bottom relay is used to switch the pre-amp in and out. The transistor below the relays is the pre-amp transistor and is commonly a 2N2907. Again, you should be able to follow the traces and components to the transistor, relay, and front panel pre-amp switch.
The amp is also very similar to the Palomar Blue Lightning, with the exception that the Blue Lightning doesn't have a output filter. The output filter is that coil/capacator arrangement between the two coaxial connectors.
Note that to run that amp you will need a 12 Volt power supply that is capable of 25-30 Amps.
Martin - K7MEM
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