[Repeater-Builder] 220 link equipment
OK Mike thanks for your reply. The duty cycle is minimal. The frequency of the repeater that I'll be linking to is 224.280 (-) and I plan to use about 20 watts into a pair of vertical yagis at 185 ft pointed southeast. At the site I will also have a full time link to a 70 cm hub repeater with a frequency of 441.600 (+). The link radio will be running 10 watts into a 6-element yagi at 40 ft. pointed west. Should I expect any problems with these frequencies and power levels ? Jeff/W5PPB
[Repeater-Builder] 220 link equipment
I'm making plans to link my 2-meter repeater to a 220 mhz hub repeater. What type of transceiver, radios, etc is best for a 220 link ? Thanks !
Re: [Repeater-Builder] 220 link equipment
At 08:16 AM 04/12/10, you wrote: I'm making plans to link my 2-meter repeater to a 220 mhz hub repeater. What type of transceiver, radios, etc is best for a 220 link ? Thanks ! One big question is what's your duty cycle going to be? Another is what is your potential desense going to be? Back before we lost 220-222 one system in an area that used in-high and out-low on UHF was going to use a couple of low end channels as inbound link frequencies until he did the math... There was no way he could make a 250w system near 441.750 live with a receiver near 220.800. He ended up using 900 Mhz for the links. After we lost 220-221 he was happy he had gone that route. It would be interesting to do a survey of 220-222 and see just how used it is. It might be worth filing the FCC paperwork to get it back. Mike
Re: [Repeater-Builder] 220 link equipment
At 4/12/2010 08:34 AM, you wrote: At 08:16 AM 04/12/10, you wrote: I'm making plans to link my 2-meter repeater to a 220 mhz hub repeater. What type of transceiver, radios, etc is best for a 220 link ? Thanks ! One big question is what's your duty cycle going to be? Another is what is your potential desense going to be? Back before we lost 220-222 one system in an area that used in-high and out-low on UHF was going to use a couple of low end channels as inbound link frequencies until he did the math... There was no way he could make a 250w system near 441.750 live with a receiver near 220.800. Why not? If the TX were 220.80 I could possibly see an unresolvable 2nd harmonic issue, but subharmonics from the 441.750 TX can always be suppressed. A long time ago we had such a problem with 1/2 the TX freq. of a UHF MVP equal to the input freq. of a 220 repeater at the same site. Had to pull the exciter out of the MVP put it in an RF-tight box, but there were no problems after that. Bob NO6B
