Introduction Amateur radio VKV PA - August 2021

VKV PA - August 2021

by
Viliam OM0AAO / OM0A
-
YU7EF yagi na VKV prevádzkovom aktíve
YU7EF yagi on VHF operating asset

After omitting the OM VHF LOW POWER Contest, which I wanted to participate from Považský Inovec, JN98as, I was looking forward to the August VHF Operating Assets again. The weather forecast promised a hot day.

Antenna and transceiver preparations for VHF PA

Position YU7EF antenna I have already practiced the whole setup, but there are certainly some things that can be improved. I like construction of the antenna through the needle OK1FJZ. These are such little things as a support handle in the car garden, tensioning of anchor ropes and the like. I use a retractable mast with a relatively small antenna, so it's not hard to lift the antenna.

We also managed to start the power plant. After more experienced advice, I loosened the lid, so that it can suck in air and no vacuum is created. Until the beginning of the VHF, the Operating Asset remained about 20 minutes. I configured the log and tuned in band, when the generator has switched off - again. I moved it to another location and carefully started again. After a minute, she turned off again. I started it again - one last try. She caught for the first time. This time I moved the choke just a little bit.

Because she ran, so i started the race with R2CW transceiverom and a new amplifier based MRF9180. But the initial connections didn't look like it at all, that I have better equipment and higher performance. One station alerted me to "narrow" modulation. This cannot be verified very much on a hill. However, since I can't simply transfer the amplifier to the TR-751E, so i decided to continue with R2CW.

Frequency offset R2CW

Connections failed at the challenge or at the expense. Only a later connection to the 9A station showed, that the problem is in frequency reading. Sked was agreed on 144,222 MHz, but the R2CW display showed 144,118 MHz!

I focused on searching, but the connections grew very slowly anyway. I also heard DL stations. Dissemination conditions appeared better than in previous months, but it didn't go well. That's why I pulled out a Kenwood TR-751E this afternoon and it felt better. This is confirmed by the number of connections, which in the third hour is higher than in the second hour.

Directions in the VHF operating asset - august 2021
Directions in the VHF operating asset – august 2021

Number of connections and locator squares in VHF PA

The end is in the log 50 connection and only 14 locator squares. Near, under Mikulčiný vrch, OK2DTF/p, went much better. And it managed to connect to KN19 with OM0FC, which I don't normally do. map links http://www.opencontest.org/edi/map/20210816155218000511CUPMYI

At home, I compared the accuracy of frequency reading on R2CW against TR-751E. Initial deviation after switching on 1 kHz rose in a few minutes at 2 kHz. The transmitted signal appears to be stable, it's just a frequency subtraction. However, according to the manual, such a deviation is within the limit.

I also compared modulation. She didn't look bad to me, but there are some sounds in the background, which are not on the TR-751E. As if it were some induction into the modulation path. So there is something to deal with until the next VHF event.

Log OM0AAO VKV PA

date time Call Mode Sent Rec WWL claimed
QRB		 calculated
QRB		 2way CC
210815 0803 S56P 1 59 001 59 031 JN76PO 331 331 ✓
210815 0808 9A0BB 1 59 002 59 050 JN85EI 421 421 ✓
210815 0810 9A2AE 1 59 003 59 088 JN86HF 322 322 ✓
210815 0815 OK2DTF/P 1 59 004 59 017 JN88VW 14 14
210815 0816 OM5AW 1 59 005 59 029 JN98AH 75 75 ✓
210815 0817 OK2KCN 1 59 006 59 028 JN89OI 69 69
210815 0820 OM3TGE 1 59 007 59 013 JN98DV 27 27
210815 0823 OL1B 1 59 008 59 017 JO80IB 151 151
210815 0824 OK2KOL 1 59 009 59 015 JN99CN 68 68
210815 0825 OM3KII/P 1 59 010 59 023 JN99LJ 87 87
210815 0827 OM6ABF 1 59 011 59 062 JN99CH 42 42 ✓
210815 0831 OK1KKI 1 59 012 59 026 JN79NF 209 209 ✓
210815 0832 OM3KHT 1 59 013 59 032 JN99JC 63 63
210815 0837 OM1OW 1 59 014 59 008 JN98HS 54 54
210815 0838 OK2OZL 1 59 015 59 024 JN89UE 30 30 ✓
210815 0840 OM1ARW 1 59 016 59 008 JN98DN 53 53
210815 0846 OK2BMJ 1 59 017 59 024 JN89VC 19 19 ✓
210815 0847 OK1DPA 1 59 018 59 042 JN89IV 137 137
210815 0850 OM4MX 1 59 019 59 036 JN88VJ 67 67
210815 0853 OM0FC 1 59 020 59 016 KN19CC 311 311
210815 0900 OM4BM 1 59 021 59 007 JN99EB 32 32
210815 0901 OM3TFP 1 59 022 59 008 JN98HS 54 54
210815 0912 YO5LD 1 59 023 59 064 KN05NR 433 433 ✓
210815 0914 OK1KTW 1 59 024 59 086 JN89IW 140 140
210815 0915 OM5LD 1 59 025 59 046 JN98AH 75 75
210815 0927 OE6V 1 59 026 59 090 JN76XU 280 280 ✓
210815 0929 OK2VZE 1 59 027 59 081 JN89JM 104 104
210815 0930 OK5SE 1 59 028 59 051 JN89DP 142 142 ✓
210815 0936 OK2BFI 1 59 029 59 007 JN89QH 57 57 U
210815 0936 OK2RSC 1 59 030 59 016 JN89QH 57 57
210815 0939 OK1KZE 1 59 031 59 109 JN79FX 277 277
210815 0948 9A7D 1 59 032 59 080 JN95CI 404 404 ✓
210815 0952 OK2MAJ 1 59 033 59 050 JN89SG 45 45
210815 0958 9A0V 1 59 034 59 147 JN95PE 434 434 ✓
210815 1006 9A3SM 1 59 035 59 077 JN85FW 357 357 ✓
210815 1008 OM4KK 1 59 036 59 027 JN88WS 24 24
210815 1011 OM4ANJ 1 59 037 59 009 JN98AV 12 12
210815 1021 OM3CQF 1 59 038 59 120 JN88RT 41 41
210815 1024 OM4DW 1 59 039 59 036 JN98HR 57 57
210815 1025 9A1E 1 59 040 59 109 JN85QT 355 355 ✓
210815 1026 OK2BSP 1 59 041 59 058 JN99AK 52 52
210815 1030 OM3WKX 1 59 042 59 036 JN98DR 37 37
210815 1032 YU7ACO 1 59 043 59 095 KN05RD 502 502 ✓
210815 1039 9A5CZK 1 59 044 59 075 JN85WL 390 390 ✓
210815 1042 OK2CVH 1 59 045 59 069 JN89VJ 48 48
210815 1045 OK1KQH 1 59 046 59 113 JN79GO 258 258
210815 1047 OK1KMP 1 59 047 59 124 JO70UK 230 230
210815 1049 OK1HWU 1 59 048 59 081 JO70TP 250 250
210815 1054 9A1W 1 59 049 59 097 JN75ST 397 397 ✓
210815 1055 9A1K 1 59 050 59 067 JN85JL 400 400 ✓

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