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G7PWA England flag England

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Link to my photos webpage http://padley.no-ip.biz


I have been off air for 9 years and I have got back into it in January 2012.

I bought a FT-8900 in April 2015.  I'm usually listening on GB3FN on 433.375MHz when I'm mobile in the mornings.

You can listen to GB3FN on the internet using websdr.suws.org.uk


At home I have:

Icom IC-7000 plugged into Alpha Delta DX-EE for 40m to 10m.

Icom IC-7100 plugged into a co-linear for 2m and 70cm and a co-linear for 6m.

AOR AR-3000A for SWL from 100kHz to 2036MHz plugged into a discone.

 


G7PWA-CCA (Covert Car Antenna)

I have recently started working mobile and I wanted an antenna that would not damage the car so I made a 70cm quarter wave dipole and put it under the rear shelf of the car.  It works quite well for an internal antenna. If you want to do this it must be with a car that has a plastic shelf and large rear window like mine.

I used 8mm diameter copper gas pipe for the dipole and quarter wave balun on the coax then measured the SWR with a network analyser and found it worked best with 15.7cm on each dipole arm and the sleve balun is shorter by a factor determined by the coax velocity factor (in this case 0.84).

    

A mag mount works better, but for a covert antenna it's good!


G7PWA-S6M (Short 6m antenna)

I made a short 6m mag mount by modifying a 900MHz antenna adding length using a coil and tuning the frequency to 51MHz using a network analyzer.  It gives me a good 6m antenna that is only 47cm long:

7909840 Last modified: 2017-02-18 15:31:05, 2968 bytes

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