October Low band activity weekend (20th - 21st)

Please post here if you are planning any significant ATV Activity such as DXpeditions or Contest participation
g0mjw
Posts: 1489
Joined: Sat Sep 20, 2014 9:15 am

Re: October Low band activity weekend (20th - 21st)

Post by g0mjw » Sun Oct 21, 2018 12:43 pm

Good signals from G8VPG/P and G4CPE on 4m today with MERs round 10-14 dB. I forgot to hit print screen when Shaun was transmitting but the MER was 8-13 dB with QSB. I have a 470MHz IF. Must modify the minitioune.ini file to make it display properly.

Mike
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G4CPE
Posts: 43
Joined: Mon Oct 31, 2016 3:59 pm

Re: October Low band activity weekend (20th - 21st)

Post by G4CPE » Sun Oct 21, 2018 4:21 pm

Good session this time on 71MHz really good pics from Shaun GW8VPG/P at 180km. and a first with Mike G0MJW.

My aerial was just a dipole at 20 feet, hope to improve in the near future.

A change of PC has reduced the noise floor on 2m and 4m considerably my old PC raised the noise floor by about 10db, I think a lot of the rubbish was being radiated from an HDMI monitor and cables. The laptop I use now has made a big improvement.

73 Arthur
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G4CPE
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Joined: Mon Oct 31, 2016 3:59 pm

Re: October Low band activity weekend (20th - 21st)

Post by G4CPE » Sun Oct 21, 2018 4:25 pm

My first pic received at 66ks/s
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g0mjw
Posts: 1489
Joined: Sat Sep 20, 2014 9:15 am

Re: October Low band activity weekend (20th - 21st)

Post by g0mjw » Sun Oct 21, 2018 4:56 pm

I have a nice video from Sean. I had to go down to 66ks to be heard by G4CPE and I had to move down the band a bit, which is OK as it fits. However, I was receiving G4CPE rather well and there was only a maximum 3dB difference in our TX powers.

I traced my not being heard well on TX problem to the dual band yagi I am using. The VSWR on 6m is very good but on 4m it is quite narrow, 1 MHz or so. The minimum is at 70.0 MHz and by the time it has got to 71MHz it is much worse and the losses were too high. I plan to try to move it up to 70.5MHz by shortening the driven element, 3cm should do it. I think we need a new design with a wider bandwidth.

Meanwhile, what about 6m? That should also work. I onw the noise it higher but so is the possibility of Es and potential new records. There is also a lot more power allowed.

Mike

G7JTT
Posts: 234
Joined: Fri Jun 10, 2016 5:05 pm

Re: October Low band activity weekend (20th - 21st)

Post by G7JTT » Sun Oct 21, 2018 5:27 pm

Only had the one one-way with Noel on 4m which was better than the zero I was looking like getting. https://twitter.com/G7Jtt/status/105406 ... 40736?s=19

g8gtz
Posts: 1390
Joined: Wed Apr 07, 2010 6:26 pm

Re: October Low band activity weekend (20th - 21st)

Post by g8gtz » Mon Oct 22, 2018 10:09 am

Well that was a lot of fun - even if it was dark by the time I packed up and got home!

Fantastic weather, lots of activity and a microwave contest as well. There was certainly something going on with conditions - some stations were weak, some were strong and there was a dark haze on the horizon for most of the day.

I think a focus on certain bands did help reduce the chaos - stations worked included:

G0UHY - tried on 71 MHz - no go.
G7JTT (40Km) - received my 71 MHz signals after a transmit problem cured itself.
GW8VPG (120Km) - Good signals on 71MHz (10dB MER) and great H265 video quality but rx problems at Shaun's end meant 1 way only.
G0MJW (25Km) - received my 71MHz but I could not see his signals.
G4CPE - tried on 71MHz but no go.
G4FRE (IO82LB) - Dave had his first ever ATV QSO (screen shot below). We tried on Saturday over the [edit] 134 Km path on 71MHz and got one way but on Sunday we did 2 way with an MER up to 20+ dB at one point. Almost but not quite equaled the UK record for 71MHz!
G4LDR (IO91GC) - we completed a NB QSO and attempted 76GHz DATV but ran out of time.
Also tried 146 MHz to G4BAO and G3VZV with no success.

I also worked 8 stations on 24GHz NB and 2 on 76GHz NB.

Thanks to all involved - 71MHz does seem to have real potential for long distance working and wondering if I should put it on the mast at home....

73
Noel - G8GTZ
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g8vpg
Posts: 357
Joined: Fri Oct 11, 2013 9:35 am

Re: October Low band activity weekend (20th - 21st)

Post by g8vpg » Mon Oct 22, 2018 11:02 am

G6AUR & myself had a very enjoyable day on the Blorenge mountain in South Wales yesterday. We left home with mist and a dead calm, but when we arrived on site there was quite a stiff breeze and we had to restrict the aerial height. Activity concentrated on 71MHz and my 333ks/s H265 pictures were seen at G4BVK/P (Westbury White Horse), G8GTZ/P, G0MJW and G4CPE, which at 180km constitutes a new one way record. Conditions did seem up a little in the morning, but faded back to normal after lunch. Unfortunately I had a problem with my 4m upconverter which was restricting its sensitivity and I was unable to receive any pictures, although Noels were frustratingly right on the cusp of decoding. I think Noels new aerial and the height he was able to erect it at helped him a lot. Late the previous evening I decided to pack 5.6GHz just in case and did try with Arthur, but it was no go.
What was also very interesting was that GW3TKH & G4HQX were on site doing the mm microwave contest with 24, 47 & 76GHz. With my 5.6GHz, that was seven dishes in a row; you can imagine how much interest this generated from the public!
73 Shaun.
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g8gtz
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Joined: Wed Apr 07, 2010 6:26 pm

Re: October Low band activity weekend (20th - 21st)

Post by g8gtz » Mon Oct 22, 2018 12:24 pm

Hi Shaun,

Yes, pity we didn't do it 2 way. Impressive array of dishes and is that an HF whip on the camper van in the distance?

Barry G4SJH was also up at Walbury operating 24Ghz and his gear along with the 76GHz gear is shown below:
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g8vpg
Posts: 357
Joined: Fri Oct 11, 2013 9:35 am

Re: October Low band activity weekend (20th - 21st)

Post by g8vpg » Mon Oct 22, 2018 4:52 pm

I think the whip in the distance was CB. The owner stayed in his van all day and did not come out to talk to us. It was very busy with walkers etc. and we fielded loads of enquiries about what we were doing.
I am annoyed that my receiver did not play ball. I am going to spend some time improving this over the next few weeks. I wonder what other people are using to upconvert 4m?
Shaun.

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