On Sunday I plan on doing some tests on Foel Fenlli with my Clansman PRC-320 hf manpack radio. This covers 2 to 30Mhz with an output of 3 or 30W.
There are various antenna combinations to use with it but on this occasion I want to try out the least efficient of them which is the 2.4m whip. This is not loaded in any way and simply plugs into the body of the radio and is tuned using a manual built-in ATU.
To quote from the user manual ‘As a manpack radio with a whip antanna, the PRC-320 provides reliable ground wave SSB communication for distances up to 35km, day or night, over the kind of country found in Western Europe.’
When set up on the ground four 9m long counterpoises are used.
I am interested in seeing if there is any appreciable NVIS from this set up so hopefully some of you will hear me if you listen carefully!I tried it out in the garden in April and Alistair GW0VMZ gave me a report of 33, so don’t expect a big signal!
The angle of the whip can be set anywhere between vertical and horizontal although in the latter position it is only about six inches above the ground.
Anyone any theories as to which angle should work best?
I seem to remember reading an article on NVIS experiments from a valley using vehicles with whip antennas and the best results were obtained with the antenna sticking out horizontally from the vehicle roof.
I can use other bands besides 5MHz if anyone wants to try a contact but only on USB, there is no LSB on the radio.
Will have the 2m handy with me as well.