IARU VHF contest

I planned to make some QSO from home. In the end i had about 10h of participation mainly during the night and sunday morning. The setup was 4ele and 200W with my HiQSDR and ME2HT transverter. The raw result shows 95QSO with highlights YT4B in CW random and IQ5NN even in SSB via aircraft scatter. 7S7V and 5P5T had pretty strong signals here.

Log results DH5YM September 2020 – visualized with DL4MFM log analyzer – (C) openstreetmap contributors

June 20 Microwave contest

I was working the contest from home and part time. The 23cm transverter with 10m IF and the HiQSDR work pretty well. I used the Quados4 antenna since the 36ele ordered was still stuck in customs. ODX was HA5KDQ and in total 41QSO and 6900 points raw score. I also made some QSO on the higher bands on request. 3x 9cm, 1x 6 and 3cm each.

23cm map of reached contacts by dh5ym during microwave contest june 2020

VUS Contest July 2019

Originally i planned to join some contest operation on the hill. On short notice i had to withdraw because my time did not allow. So i used some time in the night (when the kids are sleeping) and a little time Sunday noon to make some QSO from home. This time i operated a DK7ZB dual band yagi for 2m and 70cm. It is a 4ele on 2m and a 5ele on 70cm. The next highlight was that i was able to turn the antenna automatically and completely do remote operation from anywhere in the flat (at least for 2m). Many thanks to the guys from IQ5NN which where so patient to complete the ODX QSO with my tiny 50W. I also heard IO2V and another I station but was not able to do the QSO. In the end it was 37QSO and almost 10k points of cherry picking. 10 QSO on 70cm were done with the 20W from my good old FT-857D. 23cm i did not plan to do but the antenna was still on screwed to the mast, so i did 5 QSO. One fast local QSO on 13cm finally. 9, 6 and 3 cm were not activated because of no time.

I have to say that i cannot install fixed antennas. So its always a portable like style with small antennas that fit through the roof window or just point out there. And this kind of operation is only possible if it does not rain and it is not too cold.

DK7ZB Yagi for 2/70 and Quados for 23cm

DUR Contest May 2017

Just before the May DUR competition i got my new 6cm Transverter working. Before I faced some problems with the multiplier chain.
Murphy made that saturday afternoon i burned the control circuitry of the SMA bistable relay – poff. So i had to exchange it with my own sequencer circuitry that needs some highside FET switch to do that job.
I used a dual-band ring feed i made for tests and connected it to a old 60cm dish. The result you can see on the photo below. Very beta version ;) The PA is still missing and therefore i had only about 250mW.

I also wanted to take 3cm with me. In order to limit the amount of equipment i decided to minimize effort for 23cm. 13cm is out of order at the moment anyway. That means only using the former Wimax patch antenna for 9cm.

The following result i can claim:
23cm 12QSO 772P
13cm —
9cm 4QSO 481P
6cm 2QSO 351P (x2)
3cm 4QSO 489P
Sum 2444P

Next steps for 6cm will be adding driver (ordered from China) and the PA (10W, already here) as well as creating some better feed suitable for the mesh dish.
My goal is to operate 23/13/9/6 with one mesh dish.

This time i had a neighbour in JO61XA. DM4SWL was operating few meters away on 23cm FM only. Thanks for taking the foto !

6cm rig

after May 2017 DUR test

DUR1702 @JO61XA

I was not qrv from JO61XA for a long time. Now there was the chance to take all the equipment to Triebenberg again. During the last months i tried to repair some things here and there. The 9cm transverter got a new alignment and is working now. Saturday morning i collected all the stuff and partly assembled it. I wanted to go for 23/13/9cm and 3cm eventually. This time i used the 1m dish that i bought last year in order to save some time during the mast construction. In the end i was qrv 1 hour after beginning of the activity. So what… The goal is to test the hardware. First observations were not that promising: 1) bad connection of the DC supply for the mast transverters 2) control unit for the rotator was not working.

The later one was really bad. Later at home i noticed that i partly disconnected the cable for the display / keypad unit when fixing some loose screws few weeks ago.

For 3cm i picked a second IF transceiver. Unfortunately the wrong one. The IF is 432MHz but i took the FT-290 instead the 790R2 ;) RX/TX switching via the mimic for the 2m based transverters from the FT-817 was not working but it took me almost until end of the test to find out what was going on. So only 1 QSO there.

Also 23cm seemed to have some oscillation in the RX LNA. I got some very strange sounds from time to time when releasing the PTT. Maybe some feedback from the 13/9cm transverters because of the PTT mimic i use (i switch all chains to TX but only transfer the IF to the one i want to use. Decoupling is only 50dB which might be an issue. I need to investigate there).

Finally, when deconstructing the mast, i was a bit optimistic on the way to remove the ropes and had a very robust takedown of the antenna and transverters. The main impulse was taken bei the box of the 13cm transverter. Fortunately only the plastic box splitted into several segments. The transverters are still working fine… lucky operator ;) I anyway want to put it into a common box with the 6cm i am going to build and the new 9cm i have flying around as components here.

Hope to hear you again next time.

damaged 13cm transverter box


MMC 2016 JO61VB

This time no operation from hill. Just a few QSO from home. HiQSDR + ME2HT-PRO + PA + DK7ZB Oblong. Few hours of operation saturday evening and sunday afternoon. 78 QSO and about 18000 points claim.
The screenshot shows the great Tucnak log.
Some signals look very awful on the band…
I will not tell who it was ;) Hopefully the signal can be improved.

Oktober 16 @ JO60OM

Antennas in October contest 2016

The weather in JO60OM was obviously quite good compared to other contest locations. A nice and warm Saturday, no rain during the night and sunny sky at Sunday morning. In afternoon it started raining and the rain continued until we were back home.
The equipment was running quite well. 13/9/6cm was operated by 2 operator new to microwave under the DN5TA training call. The 23cm operation was nice with ODX G3XDY about 860km. But i had the impression that the activity is declining each contest. You really need to push the people in chat in order to get QSO done. Between 0100UTC and 0400UTC even the chat activity almost stopped. The band was empty.

Here you can listen to the ODX QSO with G3XDY:

Some pictures:

23cm signals are very wideband sometimes

23cm signals are very wideband sometimes

June 16 Microwave contest

My 1st place for 23cm in the german competition survived the logcheck. I am happy with the result although i have to say that there was only one strong competitor DK2MN in the single-Op class. Compared to may the 1st place result is about 12k less. The same points would have been place 9 in the multi-op class this time. Thats quite some difference.
My unplanned 10GHz operation brought position 16 at least.

I was operating from JO60OM, Hirtstein. The equipment was as few times before: HiQSDR, DB6NT Transverter, PA 2x100W, 1.5m dish and Quados8 antenna. The thing that worked well for the first time was the control of the antenna from VUSC log via my rotator control unit. Entering the locator, press ctrl-?, here we go.

It seems because of the thunderstorms in many regions over Europe the activity was not very high. Still i made 107 QSO and about 25000 points. ODX was YU1LA  840km via aircraft scatter.

Saturday morning before the contest i decided to take the 10GHz transverter and the 40cm dish with me. That was a good choice actually. Although i just operated that on Sunday and only in north direction i made 19 contacts. ODX was PA0BAT about 500km.

june 2016 rig after the contest

june 2016 rig after the contest

May16 JO60LK

QRV with the DM7A team from Fichtelberg, JO60LK. We worked our various personal calls on 2m, 70cm, 23cm, 10GHz and 24GHz. The weather was sunny but very stormy.
On 2m we tried a tiny 2x2x5ele setup for 2 directions. The gain was somewhat low but still the ODX was about 850km with YU7ACO. We had two newcomer with us who worked on 2m.

Here an impression of the wind in JO60LK.

V/U/SHF contest May 2016 in JO60LK

Watch this video on YouTube.

and a few pictures: