Octagon OSLO TCXO Modification

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.

http://www.dg0opk.darc.de/Octagon_LNB_mod_March2017.html

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:

http://www.pg540.org/wiki/index.php/PLL_LNB

Back to the OSLO:

Modification:

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.

OSLO with TCXO mounted

PlutoSDR operation and some microwave beacon

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).

Watch this video on YouTube.

Watch this video on YouTube.

Watch this video on YouTube.

OM Raachermaa

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!

OM Raachermaa

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.

DUR 1810

Working from home again. Only south direction 140-220°.It seems the participation in that direction was not that good. I need to put some antenna over the roof for 23cm at least.

Right side: yagies for 23/13cm, panel for 9cm. Left dish for 3cm. On the floor in the right corner dish for 6cm.

microwave rigs

 

Band QSOs Punkte AVG
1,3 GHz 5 266 53.2
2,3 GHz 7 178 25.4
3,4 GHz 1 8 8.0
5,7 GHz 1 8 8.0
10 GHz 1 8 8.0

Band 1,3 GHz

QSOs:             5
QSO-Punkte:       266
Punkte:           266
Durchschn. Pkt/QSO:   53.20
Durchschn. QSO-P/QSO: 53.20
Punkte/50 QSOs:     266
DATE MODE TIME CALLSIGN TX RX LOCATOR QRB OPERATOR REMARK
20181021 SSB 08.30 DH1DM 59 001 59 013 JO60VR 42 DH5YM
20181021 SSB 08.30 DG2DWL 59 002 59 013 JO60VR 42 DH5YM
20181021 SSB 08.32 DG5VL 59 003 59 002 JO61WA 14 DH5YM
20181021 SSB 08.48 DL4DTU 59 005 59 013 JO61TB 7 DH5YM
20181021 SSB 11.02 OK1FQK 59 006 59 021 JO70NA 156 DH5YM

Band 2,3 GHz

QSOs:             7
QSO-Punkte:       178
Punkte:           178
Durchschn. Pkt/QSO:   25.43
Durchschn. QSO-P/QSO: 25.43
Punkte/50 QSOs:     178

 

DATE MODE TIME CALLSIGN TX RX LOCATOR QRB OPERATOR REMARK
20181021 SSB 08.37 DO1UZ 59 001 59 004 JO60SX 18 DH5YM
20181021 SSB 08.50 DL4DTU 59 002 59 008 JO61TB 7 DH5YM
20181021 SSB 09.14 DO5UH 59 003 59 009 JO60WT 34 DH5YM
20181021 SSB 09.17 DG2DWL 59 004 59 008 JO60VR 42 DH5YM
20181021 SSB 09.17 DH1DM 59 005 59 008 JO60VR 42 DH5YM
20181021 FM 09.21 DM4SWL/P 59 006 59 009 JO61XA 19 DH5YM
20181021 FM 09.22 DM7MM 59 007 59 005 JO61UA 9 DH5YM

Band 3,4 GHz

QSOs:             1
QSO-Punkte:       8
Punkte:           8
Durchschn. Pkt/QSO:    8.00
Durchschn. QSO-P/QSO:  8.00
QSOs/Stunde:        1
Punkte/Stunde:      8
Punkte/50 QSOs:     8
DATE MODE TIME CALLSIGN TX RX LOCATOR QRB OPERATOR REMARK
20181021 SSB 08.53 DL4DTU 59 001 59 001 JO61TB 7 DH5YM

Band 5,7 GHz

QSOs:             1
QSO-Punkte:       8
Punkte:           8
Durchschn. Pkt/QSO:    8.00
Durchschn. QSO-P/QSO:  8.00
QSOs/Stunde:        1
Punkte/Stunde:      8
Punkte/50 QSOs:     8
DATE MODE TIME CALLSIGN TX RX LOCATOR QRB OPERATOR REMARK
20181021 SSB 08.54 DL4DTU 59 001 59 001 JO61TB 7 DH5YM

Band 10 GHz

QSOs:             1
QSO-Punkte:       8
Punkte:           8
Durchschn. Pkt/QSO:    8.00
Durchschn. QSO-P/QSO:  8.00
Punkte/50 QSOs:     8

DATE MODE TIME CALLSIGN TX RX LOCATOR QRB OPERATOR REMARK
20181021 SSB 09.44 DL4DTU 59 001 59 002 JO61TB 7 DH5YM

DUR September 2018

DH5YM – DUR1809

Part time qrv from new QTH. Good takeoff direction south and nord. Only working direction south with very limited setup.
23cm 15W 14ele
13cm 1W ringfeed

Locator:: JO61UC
Band QSOs Points average
1,3 GHz 8 318 39.8
2,3 GHz 6 203 33.8

Band 1,3 GHz

Polar map for 1,3 GHz

DATE MODE TIME CALLSIGN TX RX LOCATOR QRB OPERATOR REMARK
20180916 SSB 09.11 DG0LFF 59 001 59 009 JO61VC 5 DH5YM
20180916 CW 09.19 OK1FJZ 599 002 559 011 JO60WD 107 DH5YM
20180916 SSB 09.23 DG5VL 55 003 45 010 JO61WA 14 DH5YM
20180916 SSB 09.24 OK1IEI 55 004 59 007 JO70EC 120 DH5YM
20180916 SSB 09.27 DH1DM 59 005 59 008 JO61TB 7 DH5YM
20180916 SSB 09.30 DG2DWL 59 006 59 025 JO60VR 42 DH5YM
20180916 FM 09.56 DG4VL 59 007 59 004 JO60VX 15 DH5YM
20180916 FM 10.27 DG1VT 59 008 59 001 JO61UC 0 DH5YM

 

Band 2,3 GHz

Polar map for 2,3 GHz

DATE MODE TIME CALLSIGN TX RX LOCATOR QRB OPERATOR REMARK
20180916 SSB 09.32 DO5UH 59 001 55 009 JO60ST 34 DH5YM
20180916 SSB 09.33 DG2DWL 59 002 59 012 JO60VR 42 DH5YM
20180916 SSB 09.35 DO1UZ/P 55 003 55 007 JO60RP 53 DH5YM
20180916 SSB 09.36 DL9NCI/P 55 004 55 007 JO60RP 53 DH5YM
20180916 SSB 09.58 DG4VL 59 005 59 002 JO60VX 15 DH5YM
20180916 FM 10.29 DG1VT 59 006 59 001 JO61UC 0 DH5YM

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