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A little QRP can go along way.

22/9/2013

6 Comments

 
The local weather forecast was looking rather uncertain for the past week but it seemed to have turned out better than expected. With the close of winter and the days getting warmer, it has been a good time to get out and make the most of the bonus points on some of the higher peaks. This seems to have fuelled a fair amount of SOTA activity including a string of midweek activations from Mitch VK3FMDV and Rik VK3KAN. I was fortunate enough to be handy to the radio at home during the week and bagged some worthwhile chaser points.

The weekend was busy with a few multi summit activations from Tony VK3CAT, Andrew VK2ONZ and Kevin VK3KAB all appearing a number of times in my log. Some of these contacts I made from home and I was fortunate enough to pack the gear out on both Saturday and Sunday aftternoons for some portable operating.

On Saturday I went to Warrandyte State Park and set myself up in an elevated spot near Pound Bend. I managed to get the doublet strung between a couple of trees just the way I wanted and had some good contacts on 40 metres as well as a few more summits when they appeared on the band.

I've heard reports that we are on the downside of the current sunspot cycle and that it is not going to last as long as some previous ones, but propogation conditions seem most favourable to me lately. When things quietened off a little on 40 metres mid afternoon, I decided to have a tune around the bands. There was no joy on 15 metres but from mid afternoon 20 metres was jumping with DX.

My first DX contact for the afternoon was Andy RG4F who came back to me with a 55 report. Shortly later things really started to pick up and I had a very comfortable QSO with Andy SP8BRQ in Poland who surprised me with a 58 report. Next was Angelo IS0FDW with a 57 report followed by Victor RX1A in St Petersburg who gave me a 54 report. These were all contacts where I had to jump in and battle with much larger stations in the pileup but still managed to get through. Before packing up for the day, I found a quiet spot on 14.208 Mhz and put out a single CQ call. Ralf DL3EA came straight back to me with a 56 report.

This was the best DX session I have had operating DX with nothing more than 5 watts. I amazed myself as well as most of the stations I worked.

Sunday was similar. I was in need of a decent walk and took off towards the city and ended up at the Studley Park Boathouse. The area was packed with people so I left the car there and went for a nice hike along some of the river tracks and found a nice elevated spot away from the RF and people noise and set up the HF vertical antenna and had a short play on 40 meters. I had one SOTA contact with Kevin VK3KAB on VK3/VN-002 before packing up and walking around Dights Falls and eventually back acrossthe foot bridge near the boathouse aroud the park land past the Yarra Bend Golf Club.

Following the road across the Eastern Freeway, I found another elevated spot high up overlooking the Merri Creek and errected the vertical antenna once again. Signal reports on 40 metres this time were better and again I tried 20 metres.

Most of my portable DX contacts have been on the doublet in the past and I have really only worked a couple of ZL stations before with the vertical. Today was different. I wasn't expecting to do quite as well but I bagged the following: Janez S51DX in Slovenia with 59 both ways, Peter DL5SAM who dropped his power to 5 watts with 56 report sent and 57 report received, Oleg RY3D with a 55 report, Rene DD2VO giving a 54 report and Ivan OE3DIA in Vienna with a 57 report.

It was a fitting end to my afternoon of radio with the last contact being another portable station, Lucy M6ECG/p about 90km northeast of London who was operating from the beach at low tide near her home, QRP with a vertical antenna. It's a constant surprise to me how well 5 watts can work and what is possible when the bands are open.

6 Comments
Andrew VK1NAM link
22/9/2013 06:13:50 am

Hi Marshall, what are the dimensions of the doublet antenna and feed line? I see the antenna is 44 feet insulated in the middle. What is the length of the feedline. I'm interested and have a roll of 450 feedline.
73
Andrew, VK1NAM

Reply
Marshall link
22/9/2013 04:40:28 pm

A doublet of this size will tune all bands from 40m through to 10m - ideal for SOTA activations. The length of the feedline is not critical however avoid a 1/4 wavelength of any given frequency you might work ( ie: approx 33 ft for 40m) as it may be difficult to tune. My feedline is 37 ft of 300 ohm ladder line and I also carry another length about 7 feet which I connect with a little twin terminal block if I'm able to string the antenna really high or the bugger won't tune. A compact Z-match tuner for balanced line feeds or something like one of the little MFJ travel tuners with built-in 4:1 balun is ideal.

Probably the best antenna to use if you want to change bands quickly with a minimum of fuss. No pulling up and down to connect/disconnect links, tap coils, etc.

450 ohm ladder line will work very efficiently but may be too bulky, stiff and springy to roll up conveniently and carry for SOTA. If you are lucky enough to hunt down some quality 300 ohm ladder line just grab it. My doublet is a couple of cores stripped out of an old extension cord. The entire antenna and feed line rolls up on a compact spool.

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    Marshall  VK3MRG.
    Someone who likes to mix outdoor activities with radios at every opportunity.

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