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.
Today i managed to catch a tiny bit of the 2m sporadic E opening. Although i only have a tiny setup with 50W into a mobile antenna on the rooftop i was able to work 3 stations in soutch EA. The cloud was above HB9 and gave some good signals from EA.
EA3DBJ SSB JN00
EC5CIA FT8 IM99
EB5AL FT8 JN00
This was how the MUF map from dxmaps.com did look like:
2m sporadic E map (dxmaps) 20190702
And in those locations i was heard during the evening:
I have an older OSLO LNB which, was my spare for the websdr. Now i want to use it for QO-100. To improve the temperature stability a TCXO was fitted in place of the original crystal. Find some pictures below.
The type is a TXC 7N-26.000MBP-T from TXC. It works from 2.7 to 5.5V. Luckily the LNB works with 5V from an 7805 regulator. The TCXO was supplied by Michael DG0OPK. He suggested this type and already modified a OTLSO some years ago.
Some warning: This might not apply to current types of the Octagon LNBs. As far as i know you will likely get a 25MHz crystal version if you try to buy one. It will not be possible to use the 25MHz LNB with a lower reference frequency.
LNB with NXP TFF1017 IC could be an alternative as far as i know. I have no experience with this type. Here is some reference:
First i removed the crystal. It is necessary to use hot air because otherwise the pads might be damaged. But they are still needed. Also the 0 Ohm resistor over the two traces that go between the two pads needs to be removed. The trace connected to the former crystal pad closer to the RF section needs to be disconnected. This crystal input will be left unconnected.
OSLO LNB with crystal removed
Now a insulated copper wire can be connected to the pad of the former 0 ohm resistor that leads to the converter IC. The capacitor to ground at the crystal pad close to the 7805 regulator needs to be replaced by a short. The other crystal capacitor should be replaced by 100nF.
OSLO prepared for mounting TCXO
Now the TCXO can be soldered. It is important to avoid shorts of the pins of the TCXO towards the PCB. I soldered the TCXO slightly elevated. It is important to keep distance from the border of the PCB because the cap of the LNB still needs to be mounted. The insulated copper wire can be connected to the output of the oscillator which is pin 5 (right of the row of capacitors). The pad with the remaining capacitor towards ground needs to be connected to the output of the 5V regulator. It is the regulator pin with the 0 ohm resistor.
The pins of the TCXO are assigned as: 9=VCC (left of the capacitors), 4=GND, 5=Output.
Below i add some short videos i made. The first two show transmit and receive operation of the PlutoSDR in the 6cm amateur band. I used the great sdrangel software. The opposite side is my normal 6cm rig consisting of a FT-817 and a DB6NT transverter.
The third video shows 3 of the DM0TUD microwave beacons that are located close to my home. It is from right to left: 13cm (FT-290), 3cm (FT-790R2), 9cm (FT-817).
This is an traditional figure from the Erzgebirge. OM seems to do VHF contesting which is also popular there ;) But maybe not only the OM is smoking but the transceiver as Wellness eventually. Merry Christmas to all of you!
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.
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!