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Protecting receivers from damage from nearby transmitters
Good afternoon... I have several receivers and transceivers that I'm going to set up to monitor different frequencies. Then I'll use the main rig for transmitting (occasionally use the others to transmit but they'll be used for receiving 99 percent of the time). I need to know how best to protect the front ends of the other radios from damage while I transmit, especially if I accidentally transmit on the frequencies to which they're tuned. The main transmitter runs 200 watts and the antennas for all the radios are a few dozen feet apart, and that seems like an awful lot to go feeding into the front ends of some of the solid state rigs. Receivers and transceivers a Icom IC-735 Kenwood TS-120S Yaesu FT-1000 Kenwood TS-940 Hammarlund HQ-180A (I hope...if I find one) :-) Zenith Transoceanic R-7000 The FT-1000 is the one that will be used most often for transmitting. I'm not real concerned about the Hammarlund but the rest of them, particularly the Zenith, seem somewhat vulnerable. |
#2
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Protecting receivers from damage from nearby transmitters
"Rick (W-A-one-R-K-T)" wrote in message news Good afternoon... I have several receivers and transceivers that I'm going to set up to monitor different frequencies. Then I'll use the main rig for transmitting (occasionally use the others to transmit but they'll be used for receiving 99 percent of the time). I need to know how best to protect the front ends of the other radios from damage while I transmit, especially if I accidentally transmit on the frequencies to which they're tuned. The main transmitter runs 200 watts and the antennas for all the radios are a few dozen feet apart, and that seems like an awful lot to go feeding into the front ends of some of the solid state rigs. Receivers and transceivers a Icom IC-735 Kenwood TS-120S Yaesu FT-1000 Kenwood TS-940 Hammarlund HQ-180A (I hope...if I find one) :-) Zenith Transoceanic R-7000 The FT-1000 is the one that will be used most often for transmitting. I'm not real concerned about the Hammarlund but the rest of them, particularly the Zenith, seem somewhat vulnerable. Rick, I think you are wise. If you are transmitting primarily from one transmitter, you could put paired diodes across the inputs of the monitoring receivers and use parallel grounding relays connected to the enabling voltage of the transmitting transceiver. Of course you would need to disable the grounding relay on the transmitting transceiver. Ed, N5EI |
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