DARC 10m Contest 2021

This year i spent quite some time in preparation of the 10m contest. Already a year ago i bought some fishing rods with the plan to make a Moxon antenna. This antenna was realized now. The transceiver was my HiQSDR again driving a R155 PA. In order to improve sensitvity i connected a wideband LNA from Funkamateur. The LNA was switched on and bypass by one of my sequencer PCBs. Quisk SDR forwarded 192kHz IQ samples to skimmer and from there the decodes went to the bandmap of tlf log. I started in CW and worked quite some multies. After one hour i changed to SSB which was a likely a fault because the activity in phone was low. The last 30 minutes were spent in CW again.
The map below shows the locations of the stations worked. They were taken from internet and might be incorrect. The map shows that i mainly had the moxon to north and west direction.

stations worked in 10m contest 2021 – maps by openstreetmap and opentopo contributors via DL4MFM edi analyzer


The most heavy part of the moxon is the mounting plate. The fishing rods are snapped to the plate and then fixed with U brackets. There are 16 wing nuts to fix.

10m moxon antenna under test indoor


Getting the antenna outside is not that easy. It needs to be mounted outside and there was little space because of a chimney nearby.

Moxon antenna mounted outside the roof window


It you do not take care everything will end up in a big mess.

Gordons knot – wires of the moxon


The software did cosist of Quisk, skimmer and tlf log.

SDR software just before the contest


The R155 PA can generate 100W with 5W input. Unfortunately it seems not very robust against some RF nearby. The linear power supply i tried to use before went unstable in SSB. Therefore i had to swap the supplies.

PA and power supply


HiQSDR is quite unsensitive on 10m. I used a LNA from Funkamateur which has bypass relais for TX. I had to replace the transistors because both where faulty.

HiQSDR and preamp

Marconi Memorial Contest 2020

Due to partial lockdown no multi-op activity. Other weekend activities cancelled as well, so found some time to participate the MMC from home.
The setup was my usual HiQSDR + ME2HT + 200W Transistor PA + 4 ele.
About 11h operating time resulted in 134 QSO with ODX 730km..

It was pretty obvious that almost all the big multi-op teams where missing. Still some good DX oportunities even for my tiny station.
IQ3AZ was super loud. The attempts with SM6VTZ and YO5LD failed although we heard each other for short moments.

TOP 10 DX QSOs:
——————-
9A8D JN95LM 731 km by DH5YM
9A4M JN85EI 669 km by DH5YM
IQ3AZ JN65QQ 602 km by DH5YM
S51S JN75ES 595 km by DH5YM
HA6W KN08FB 592 km by DH5YM
HG1A JN86MM 564 km by DH5YM
9A5RJ JN86EL 550 km by DH5YM
PA0O JO33HG 539 km by DH5YM
HB9FAP JN47PH 529 km by DH5YM
S59P JN86AO 528 km by DH5YM

Marconi Memorial Contest 2020 // Image created by DL4MFM log analyzer. Kartendaten: OpenStreetMap-Mitwirkende, SRTM | Kartendarstellung: OpenTopoMap (CC-BY-SA)

2020 October DUR test

Recently my new 23cm LNA showed up here. For the DUR activity contest today i integrated it into my transverter system. 9cm got double points this month. Therefore i also tried to be active there. Not that much activity and only 2 QSO. The 23cm result was quite good due to some nice DX with SM6VTZ, HA5UA, HA5YA and OM5CM.

23cm result October DUR // Image created by DL4MFM log analyzer. Kartendaten: OpenStreetMap-Mitwirkende, SRTM | Kartendarstellung: OpenTopoMap (CC-BY-SA)


New 23cm LNA


23cn and 9cm antenna

2020 October UHF/SHF

Originally planned some more QSO but in the end there where more time constraints than expected. Therefore only 21 QSO on 23cm sunday morning. I skipped all other bands. 70cm was not ready anyway. ODX HA5KDQ with >500km.

Image created by DL4MFM log analyzer. Kartendaten: OpenStreetMap-Mitwirkende, SRTM | Kartendarstellung: OpenTopoMap (CC-BY-SA)

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