Netherlands 145 MHz DATV activity day

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g8gtz
Posts: 1363
Joined: Wed Apr 07, 2010 6:26 pm

Netherlands 145 MHz DATV activity day

Post by g8gtz » Tue Jul 14, 2020 3:25 pm

Trevor M5AKA reports
The Netherlands IARU member society VERON is encouraging its members to use DATV in the 2m band in August:

• Date: Saturday, August 22, 2020
• Time: 1200-1600 GMT
• Frequency 144.600 MHz or 145.300 MHz
• DVB-S or DVB-S2 Symbol rate 125k
Details at https://www.veron.nl/nieuws/datv-experiment-2-meter/
Note, they were inspired by the work we have done in the UK so be good to try and have some cross band with 146MHz activity across the North Sea - paths exist from Dungeness Power station in the South to Redcar and beyond in the North so be good to spread our selves out a bit. Need to choose sites away from 2mt repeaters!

We'll make contact with PA3CRX and try to arrange some scheds - they may even want to use dxpot for co-ordination!

73

Noel - G8GTZ

pe1itr
Posts: 4
Joined: Tue Jan 21, 2020 10:26 pm

Re: Netherlands 145 MHz DATV activity day

Post by pe1itr » Tue Jul 14, 2020 5:12 pm

I will be QRV from JO21QK.
Station 200w DATV 10 element yagi 6m AGL. DVB-S2 SR 125k I will be using 144.600 MHz or 145.300 MHz for TX.
Receiver: 0.6 db pre-amp + minitiouner. Listening up to 147 MHz
Skeds on DXspot TV or by email.

73 Rob PE1ITR
JO21QK

radiogareth
Posts: 613
Joined: Wed Jan 06, 2016 9:46 am

Re: Netherlands 145 MHz DATV activity day

Post by radiogareth » Tue Jul 14, 2020 6:51 pm

I seem to remember Bob Platts and crew had good results with QRP 10Ghz stuff over the sea and far away in that direction. Looking a bit further north (Southwold/Orford area) as have a sister up there. Good excuse to visit.
Gareth

g8gtz
Posts: 1363
Joined: Wed Apr 07, 2010 6:26 pm

Re: Netherlands 145 MHz DATV activity day

Post by g8gtz » Wed Jul 15, 2020 8:13 am

Yes, John G7JTT and I went to Dungeness and worked a number of Dutch stations on 10GHz FM in 2000.

Aldeburgh beach road looks good - maybe busy on a Saturday - https://www.google.com/maps/d/u/0/edit? ... 159326&z=8 and https://www.google.co.uk/maps/@52.14329 ... 312!8i6656

I'm thinking to maybe go somewhere in Kent....

73

Noel

G3GJA
Posts: 129
Joined: Sun Nov 20, 2011 3:44 pm

Re: Netherlands 145 MHz DATV activity day

Post by G3GJA » Sat Aug 22, 2020 3:41 pm

Richard G4YTV received two Dutch stations today that were taking part in the Activity Day. Both were sending DVB-S, 125kS/s, FEC 1/2, H264 on 145.300MHz

PI4D / PA800D was D2 at 403.5km one way Rx; only just short of the world record which is 407km

G4YTV - PI4D.jpg
G4YTV - PI4D.jpg (218.86 KiB) Viewed 1122 times

PA0JCA was also D2 at a distance of 380.5km

PA0JCA-2m.png
PA0JCA-2m.png (650.31 KiB) Viewed 1122 times

Surprising that nobody else in the UK was making use of the flat conditions to work the Netherlands on 2m DATV!

Spots.jpg
Spots.jpg (75.91 KiB) Viewed 1122 times

Clive G3GJA
Last edited by G3GJA on Mon Aug 31, 2020 10:43 am, edited 2 times in total.

M0DTS
Posts: 462
Joined: Sun Feb 24, 2008 9:03 pm

Re: Netherlands 145 MHz DATV activity day

Post by M0DTS » Mon Aug 24, 2020 7:12 pm

Well done!

Unfortunately i had to work over the weekend so missed out on the activity.
I had hoped to go to Ravenscar... maybe next time.

73
Rob

G3GJA
Posts: 129
Joined: Sun Nov 20, 2011 3:44 pm

Re: Netherlands 145 MHz DATV activity day

Post by G3GJA » Wed Aug 26, 2020 11:47 am

Ravenscar would have been an good location to tap into the AS from planes coming out Schiphol, especially those heading out for an Atlantic crossing.

I can't see any other propagation mode being in play last Saturday afternoon. Hepburn and F5LEN showed no tropo possibilities. G4YTV fires into the flight path from Schiphol to Manchester when beaming to the Rotterdam area, so there's plenty to bounce off if you are patient.

I haven't got full details of the station that the Dordrecht Club was running yet. The power or ERP would be interesting to know.

However, running 125kS/s is clearly viable and with the higher power available in the 144-146MHz segment it might be worth trying in the UK.

Clive G3GJA

Pe1bbi
Posts: 5
Joined: Wed Aug 26, 2020 5:14 pm

Re: Netherlands 145 MHz DATV activity day

Post by Pe1bbi » Wed Aug 26, 2020 5:38 pm

Dear ATV-er

First time on this forum.
Call: PE1BBI gerard
I am from Groningen in the NE part of the Netherlands
Last 5 years activ in the atv contest 2 weekend in december in analog
ATV on 70 and 23; with optimized antennes: 3x 23 el on 70 cm and 2mtr dish on 23 cm sdr sharp
we managed even under no propagation max 273 km.

I also dit join de dutch datv activity day on RECIEVE only.
I managed i recieve on PE1ITR/P 243 km. Running a EME systeem of 6 x 10 el X-pol.
RX: HackRF One with sdr angel.


ANSVER FOR CLIVE:
The 2 stations recieved bij G4YTV i have some info on that:

PA800D(event call from PI4DEC) they did rum 100 w in a Yagi qth Dordrecht.(Their website under PI4DEC)
PA0JCA 80 W in a 4 el at 10 mtr Amstelveen (very close to Amsterdam airport)

Clive i think your are right with the airscatter theory. In the contest i had lots of problem with fast qsb on the signal.
Next time i will try to listen on circulair polarisation(I forgot it).

Next step wil be transmitting; I have not yet chosen the tx concept.

73 gerard

KenW6HHC
Posts: 307
Joined: Mon Jun 01, 2009 4:20 pm

Re: Netherlands 145 MHz DATV activity day

Post by KenW6HHC » Tue Sep 01, 2020 4:10 pm

Hi Clive G3GJA,

Two quick questions on the Netherlands 2M DATV posts

1) Do you know the location that G4YTV was using to receive the DATV stations in Netherlands. It is not clear to me if he was at home or portable??

2) Is it correct that the BATC stations can not transmit DATV on this experimental Dutch DATV frequencies (144.600 and 145.300 MHz)?

Thank you for any help...de Ken W6HHC

Pe1bbi
Posts: 5
Joined: Wed Aug 26, 2020 5:14 pm

Re: Netherlands 145 MHz DATV activity day

Post by Pe1bbi » Fri Sep 04, 2020 5:12 pm

Pe1itr is this evening qrv on
144600 mhz dvb-s 125 kc/s fec 1/2
Starting 1930 gmt
Tx 100w 3x 11 el
Locator jo23ke Texel island

By gerard pe1bbi

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