Digithin on air - 95 Kms on 146 Mhz

The place for discussion about the RPi add-on RB-TV modulator card developed by G4EWJ and supported by the BATC Shop
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g8gtz
Posts: 875
Joined: Wed Apr 07, 2010 6:26 pm

Digithin on air - 95 Kms on 146 Mhz

Post by g8gtz » Tue Jun 16, 2015 7:41 am

On Sunday using Digithin with the on board Si570 oscillator module with a YU1LM bandpass filter on the output - absolutely essential see http://yu1lm.qrpradio.com/bp%20yu1lm.htm

This went in to an RD06 and RD15 amplifier (M0DTS in CQ-TV 247 and needs very careful screening between stages) and an 9 element yagi I managed a one way QSO with G4CPE over 95 KMs.

Unfortunately I did not manage to receive Arthur which is why this post is in the Digithin thread and not Minitoune thread :-)

Congratulations to M0DTS and G1LPS who managed a 115Km 2 way QSO on the same day!

73

Noel - G8GTZ

g8gtz
Posts: 875
Joined: Wed Apr 07, 2010 6:26 pm

Re: Digithin on air - 6 dB improvement over DVB-S

Post by g8gtz » Tue Jun 16, 2015 5:28 pm

Out portable again today and worked G3PYB over a 1 mile path to test 146.5 MHz gear was working.

Also worked G4KLB from Portsdown Hill over a 56 Km obstructed path on 70cms. He had an MER of about 6 dB on 2MS normal DVB-S but a 12dB MER using 333kS from a Digithin - with a 3dB improvement each time you half the bandwidth, a 6 dB improvement is what you would expect :-)

73

Noel - G8GTZ

G4KLB
Posts: 198
Joined: Wed May 28, 2008 10:46 am

Re: Digithin on air - 95 Kms on 146 Mhz

Post by G4KLB » Mon Jun 29, 2015 10:11 am

Had a good two way contact with both stations using 70cm DigiThin TX today.
https://www.youtube.com/watch?v=58c0MC_k_-A

G4KLB
Posts: 198
Joined: Wed May 28, 2008 10:46 am

Re: Digithin on air - 95 Kms on 146 Mhz

Post by G4KLB » Wed Jul 15, 2015 9:15 pm

Had a good two way to France with Rolf F9ZG.
F9FG.jpg
F9FG.jpg (273.93 KiB) Viewed 1493 times
Rolf kindly emailed the picture he saw in France


photoG4KLB1.JPG
photoG4KLB1.JPG (91.45 KiB) Viewed 1493 times
I had better pictures but didn't take a photo!

My TX was a DigiThin on 437MHz 333Ks 3/4 FEC

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