4m access in DL / 13cm&6cm for class E

German BNetzA released notifications 414/2018 and 415/2018. Those extend the permission for class E operators to work in the 13 and 6cm band as well give a new permission for 4m band access in DL. On 4m class A will be allowed from now on to Dec.31 2019 to work between .150 and .200 with 25W ERP max.

Some more sporadic E on 4m

Recent days showed some more sporadic E conditions. I worked EA and LZ. Monday evening i went away from the PC and when i returned i saw a CQ from 9K2YM. Unfortunately it was too late. Later on i also catched a CQ from S01WS. PSKReporter showed some really interesting spots by DK2EA. He received stations from the Carribean sea and others received transmissions from Japan and eastern China.

CQ of 9K2YM

4m ES condition on July22 2018.

BTW: the very nice and useful DXMaps page has changed to openstreetmap. Now its possible to show screenshots which was not possible because of license restrictions before. Thank you very much!

MSK144 QRP and ES0UG (/8)

This week some people from here work from Estonia under the call ES0UG (and ES0UG/8). Since there are no good ES conditions currently we tried MSK144 meteor scatter. I did not think there will be a lot success since i can only run 25W ERP. But finally i god some of their CQ.

ES0UG/8 calling CQ in MSK144 from KO18

During my lunch break i did not have success. In the evening we tried again and were able to complete the QSO to KO18 field within about 1.5h.

Since yesterday evening the crew is qrv from the next island in KO19. We tried again in MSK144 and this time we had bursts rather early. It still took more than an hour to complete the QSO and this time i have a nice screenshot.

ES0UG in KO19

Since i did not expect that it will work at all i am quite happy with my first two QSO via MS. I also got some spots from G3SHK. Many thanks!

Another great ES opening

This evening great ES opening to EI and G. And a surprise in between with S01WS.

It started in CW with EI4DQ in IO51WU and then i worked:
EI8IQ,IO62
GW6TEO,IO71
G0MJI,IO83
G4BRK,IO91
GW3TKH,IO81
G4FKI,IO92
G4APJ,IO83
G3SHK,IO90
GD0TEP,IO74
G0CHE,IO90
S01WS,IL46
G0RNU,JO01
GI0RWO,IO74
MM0INH,IO85
SV3/SM4KYN,KM16
GU6EFB,IN89
G8TTI,IO81

In the screenshots 23cm is displayed as QRG. This is because i use a wrong transverter setting in my SDR software which is taken over by WSJT via hamlib.

finally worked S01WS

big signals on 4m

4m ES opening June 1st 2018

This evening pretty good ES opening into several area of Europe. Also the 4m band was in quite interesting condition.
I worked some EA station + OH + SP all in FT8. Seems most of the stations are in this mode now.
Signal were pretty amazing strong. Also heard G and several times the OY6BEC beacon in IP62 as well as a LA beacon.

4m_FT8_20180601


4m_ft8_20180601_2

17:24:20,EA6VQ,JM19,-16,-17
17:36:00,EC1AJL,,+3,-06
17:44:18,EA1AF,IN71,+06,-05
19:55:31,DK2EA,JO50,-18,-12
20:15:00,OH8WW,KP24,-01,-11
20:52:58,SP3RNZ,JO92,-11,-06

A small VHF/UHF driver

I was searching for a small driver for 2m in order to have enough power for my microwave transverters. I usually drive them with about 500mW. Since i have a transverter block with about 0dBm output it needs some gain. Again i found something from China. The advertisement told something about 1.5W, the pictures showed a PCB with a print 35dB/3.2W. However, i thought it could be good enough to get 0.5W out of it.

A small VHF/UHF amplifier


When the device arrived i noticed that the manufacturer milled the top of the two amplifier IC. Very funny that the guys there try to save their designs from unwanted copy ;)
At the input there is a 6dB attenuation pad which are followed by two amplifier stages of unknown type. The first stage is supplied via a 5V regulator, the second one is connected to the supply input directly. I used 12V to do some measurements.
The first action was to know the gain of the circuit. I wanted to see if it is really working from 1 to 700MHz.
In the picture you see the little noisy measurement. The drive from the analyzer was set very low.

Gain of small VHF/UHF PA


From the gain curve it can be seen that the device is probably not working that well at the lowest end of the shortwave. But at least from 30MHz on it should be usable. Towards upper frequencies the gain is decreasing a lot but still 27dB at 700MHz. For the 2m band roughly 43dB gain is achieved and about 33dB in the 70cm band.
Finally i wanted to know which output power can be achieved in the amateur radio bands.

VHF/UHF PA output power


At about 1W output the output always gets compressed. You might add about 0.4dB on 70cm and 0.3dB on 2m to my measurements since the graph does not include the attenuation of the output cable. For me it means that the amplifier should work well for my purpose.

Searching for some FreeDV QSO partner on VHF

Since i use Quisk for my HiQSDR i found it interesting to experiment with FreeDV again. Quisk can directly support using the FreeDV API and work in this digital mode without building lots of cables. Since i wanted to try the latest mode 700C i had to compile the library from the scratch and add the mode to the configuration of quisk. Below you can find recordings of my CQ call in the modes 1600 and 700C which were made loopback.
Now i search for a QSO partner preferably on 2m somewhere in the area around JO61. I can work relatively well direction southeast. So east OK might be good.

Mode 1600

Mode 700C

Please remember the 700C mode uses only 1kHz of bandwidth.
If you are interested in some tests just send me a email to dh5ym@darc.de

One season 4m …

Yesterday the 4m TX permission in DL ended for this year. Hopefully we get another one next year. For me it was the first time and it was rather interesting to compare real band opening with the propagation prediction on dxmaps. Unfortunately i missed the big ES in June. I was on vacation and also my transverter was not ready that time. But still i made some QSO.
A frequent “beacon” on the band was DK2EA. We had several short qso and it was always a stable connection although we both used low power and small antennas.
During the ES openings i worked EA, EI, SV and LZ. I also worked some OK stations and some local stations as well.

While i was using my FT-817 as IF TRX last days i hooked up my HiQSDR to the transverter.
The day before yesterday i noticed some band opening to G. I heard the beacons GB3ANG and GM8RBR. You can see the screenshot below. While GB3ANG was rather stable over a long time GM8RBR more in the north was fading in and out all the time.

4m ES 2017-08-30


I also heard GM4ZMK calling CQ. Unfortunately outside the frequency range allowed for TX in Germany. The opening to him was only few minutes.

Find the audio files here:

GB3ANG/B 20170830

GM8RBR/B 20170830

GM4ZMK 20170830 calling CQ

DG3LSM 20170830 local

Now i will disassemble my 4m station and switch to other activities. Hope to hear you on this nice band next year.

Another 4m ES

Last week i met another ES opening and worked LZ1ZP and LZ1ZX. I also heard the LZ2HV beacon and once again SV2JAO/B.
LZ1ZP was extremely strong. Here you can find a short video of his signal in SSB (29MHz = 70MHz with transverter):

LZ1ZP 4m band SSB via ES on Aug/25/2017

Watch this video on YouTube.

Below you find some audio snippets of ES signals i recorded the last weeks.

2017-08-03 4O0BCG/B

2017-08-03 SV2JAO/B

2017-08-25 LZ2HV/B

2017-08-25 LZ2HV/B

2017-08-25 LZ1ZP CW

2017-08-25 LZ1ZP SSB

Another lunch time ES

Today i was lucky again. During lunch i worked LZ1AG and OK1VBN. Heard the beacons SV2JAO/B and 4O0BCG/B. Also 9A/S51DI/P came back to my CQ, but i did not manage to copy the complete call. Sorry! Unfortunately i did not have a 2m rig available since the band was also open on 144MHz.