Crossed or not crossed is the question
Hi All,
Ok, I have struggled to get my hands on an Arrow antenna for love nor money! So, I did get a Maldol non-crossed Yagi for playing with the birds. Its all on the same plane, and the 70cms starts at the 2m Driven element, its receive is excellent and cannot complain on this front.
My question to you guy is, that after i bought this one, I thought that it would be hard to operate in full duplex mode as i almost get cross talk on the 70cm side. Does this not happen on a crossed boomed yagi like the arrow? Should i still invest in an arrow when i find one, as AMSAT UK doesn’t know when they will get any.
All the best,
Chris – M0DQO
IO90KU
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My question to you guy is, that after i bought this one, I thought that it would be hard to operate in full duplex mode as i almost get cross talk on the 70cm side.
Polarization is not the only thing to consider. There's also wattage, feedline arrangement, and receiver quality.
I'm using a Cushcraft which has the 70cm alongside the 2m elements. For FM, I'm running 75 watts xmit on 2m. With the default feedline which consisted of two 3foot segments teed to a length of RG-58, I was getting a lot of desense on transmit. I changed to seperated feeds of higher quality coax, and now am running full duplex just fine.
I haven't been able to run full duplex on AO-7 yet though. That setup consists of the same antenna plus an FT-817 for rx and transmitting SSB at 5-35 watts from an IC7000. I get crosstalk in the FT-817 even at 5 watts xmit from the IC-7000.
Scott NW2S
participants (2)
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Chris Bloy -
Scott Wilson