Sunday, 13 April 2014
With the news about possibly extending the 2m band up to 147MHz I had an idea about wide split repeaters with the output on a frequency outside the amateur band.
Wide split 2m repeaters would be a good thing, even if the output frequency was outside the amateur band (needs to be cleared anyway). There must be some space on 140, 143, 149 or 152 MHz now to allow a >4MHz split. Could also be done on 4m with 80-81.5 MHz old fire frequencies.
Monday, 7 April 2014
Friday, 4 April 2014
Monday, 27 January 2014
Sunday, 26 January 2014
The A99 is a half wave normally, so to work with the existing matching circuit, the length would have to be extended to around a full wavelength. Whether it makes any difference to 27MHz performance is debatable, I've not seen a decent review of one where anybody has measured a difference before and after adding it. When I put mine up, I was replacing a broken A99 and had no known signals to compare it with.
The A99 is just a half wavelength wire inside a tube, and without adding to the length, can't see there being a way of improving it on 27MHz without doing something like changing the matching circuit (there are losses in there, which would have an even bigger effect at lower frequencies - see this article).
At lower frequencies the top loading might help reduce these losses, so it could be an improvement for those wanting to use it on other bands like 14 and 18MHz.
I tried the Fire Up 99 on the car using a magmount which is far to small to drive anywhere with it. Not that it would be any use as an antenna on its own, as you can see from the SWR plots.
It seems to be a 3/4 wavelength at 34MHz and a 5/4 wavelength at 55MHz. Compared to a mobile CB antenna received signals are much worse at 28MHz.
Saturday, 25 January 2014
But I had my microphone plugged in for a change (it's the one off my FT-817, the wiring is the same) and called GB5LBC (Roa Island lifeboat station) on 7.180 MHz, who was only 7.3Km away from me. That worked OK and it was the furthest this Flex1500 has ever got on SSB since I bought it.