Thursday, 30 August 2012


D-Link ShareCenter NAS and ZyXEL gigabit switch. NAS has 2x1TB drives configured as RAID 1.

Vertical with SRC UnUn

Used about 4.5m of wire taped to a fibreglass fishing pole, fed through a Snowdonia Radio Company UnUn. Resonant frequency came out lower than I thought it would, either the ratio of the UnUn meant that the best length was less than a half wave or the pole was altering the resonant frequency.

The resonant frequency was 23.680 MHz with a 3:1 SWR bandwidth of 15.680 to 29.120 MHz.
That was with no radials and a 30cm patch lead between the UnUn and AA500 analyser. I was holding the antenna vertically above ground in the garden for this test.
It should work OK on the 21 and 24 MHz bands, and should be able to get away with 18 and 28 MHz without a tuner.
I think about 7.5m of wire would be needed to get the resonant frequency on 14MHz, using either a 7m fishing pole, or coil the wire around the pole to get the extra length. 

Friday, 10 August 2012

HF from the caravan

Got another USB to serial converter from Maplin in Llandudno and set up a small HF antenna on the caravan. Using the 'long wire balun' and about 7 metres of wire.
Noisy 4 amp 12 volt PSU (bought off Ebay to power a TV) that I was using to run the FT-817 made it impossible to receive anything though.

Tuesday, 7 August 2012


Drove to the top of the hill at Gwaenysgor (above Prestatyn) this afternoon. The road turns into a track after a bit. A good view towards the north (could see Blackpool Tower).
What is the broadcast type antenna on the small mast (funny looking dipole)? Real Radio is from that site on 107.3 but there is a slant polarised yagi on the tall mast which is what Real Radio should be using.
Spoke to G4UXH/P on Burney (WOTA LDO-075) on 145.300 from up there on the car radio.

After this we went for a walk at Mynydd y Cwm (SOTA GW/NW-076) where I made one QSO with 2E0MIX/P on WOTA LDO-058 (Raven's Crag Stickle Pike) using my handheld only. No replies to my CQ calls on 145.500 so that's the 2nd time I've been up there without getting an activator point.

Netmonitor Kinmel Bay

Using Netmonitor (Android) with 3G turned off on the O2 network at Kinmel Bay, North Wales.
Active cell and neighbour cell channels. Channel 121 is 959.2 MHz (935+(channel*0.2))
There is a menu item to manually select what frequency to put the phone on but doesn't seem to be supported on the Galaxy Note.
I brought the FT817 with me but forgot the USB to serial cable to get the data cable to work with my laptop.
The caravan site I'm staying at is using a 169 MHz simplex frequency for their radios (I'm not staying at a school or a kitchen appliance factory so you have 4 choices to guess from!).

The white colinear is for public Wi-Fi around the site. The dipole looks like it's for 169MHz. There are also 2 UHF dipoles round the other side of the building, but haven't seen anyone using UHF radios.

A big caravan site across the road is also using VHF Hi-Band but with a repeater.