Success Stories
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- Posts: 39
- Joined: Tue Feb 14, 2017 8:39 am
Re: Success Stories
Hello everybody,
I have done a light version of the wonderful Portsdown digital transmitter (only 437 Mhz) for now but how is my pleasure to show you the result :
many thanks to all for your help !!!! but the adventure will be continued
I have done a light version of the wonderful Portsdown digital transmitter (only 437 Mhz) for now but how is my pleasure to show you the result :
many thanks to all for your help !!!! but the adventure will be continued
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- rpi3.jpg (125.84 KiB) Viewed 6703 times
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- rpi2.jpg (86.82 KiB) Viewed 6703 times
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- rpi1.jpg (116.62 KiB) Viewed 6703 times
Re: Success Stories
Just an update that I now have all three camera video modes on Portsdown working correctly using my Portsdown/RPi-3/DATV-Express test set-up.
The Pi-CAM and an NTSC home video camera via EasyCAP (BATC VideoDVR unit) all work well.
* Mpeg-2 - video displays correctly
* H264 – now video displays correctly
* EasyCAP – now displays H.264 video correctly
Block Diagram of Portsdown/RPi-3/DATV-Express using either Pi-CAM or EasyCAP or even JPEG file as video source
So a Portsdown newbie can succeed.
Time to start testing audio inputs for Portsdown and creating the extension-cable for my Pi-CAM.
73...de Ken W6HHC
The Pi-CAM and an NTSC home video camera via EasyCAP (BATC VideoDVR unit) all work well.
* Mpeg-2 - video displays correctly
* H264 – now video displays correctly
* EasyCAP – now displays H.264 video correctly
Block Diagram of Portsdown/RPi-3/DATV-Express using either Pi-CAM or EasyCAP or even JPEG file as video source
So a Portsdown newbie can succeed.
Time to start testing audio inputs for Portsdown and creating the extension-cable for my Pi-CAM.
73...de Ken W6HHC
Re: Success Stories
Hi Ken,
Good to know that you succeed and everything works.
Regarding the PI camera extension:
I spend a few dollars and bought this:https://www.tindie.com/products/freto/p ... extension/
Good quality and fast delivery
Regards
Rainer
Good to know that you succeed and everything works.
Regarding the PI camera extension:
I spend a few dollars and bought this:https://www.tindie.com/products/freto/p ... extension/
Good quality and fast delivery
Regards
Rainer
Re: Success Stories
Mine is up and running, just waiting for a few bits to finish the PA for 146.5MHz and I am waiting for an enclosure for the touchscreen from a 3D printer to mount it on the case front.
Mark
G0MGX
Mark
G0MGX
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- AntennaCam (1).PNG (299.62 KiB) Viewed 6545 times
Re: Success Stories
Hi All,
I've now completed a BPF, LPF and a PGA44 preamp from 'DDK:
http://g0mgx.blogspot.co.uk/2017/06/fil ... lters.html
I can provide build details of the filters if anyone is interested. The PGA144 is a tiny bit low in frequency which I need to address - but I think it will be OK for the time being.
Mark
G0MGX
I've now completed a BPF, LPF and a PGA44 preamp from 'DDK:
http://g0mgx.blogspot.co.uk/2017/06/fil ... lters.html
I can provide build details of the filters if anyone is interested. The PGA144 is a tiny bit low in frequency which I need to address - but I think it will be OK for the time being.
Mark
G0MGX
Re: Success Stories
Hi Mark
All looks great - it would make a good CQ-TV article
Don't know how I'd missed the PGA144 from Sam, looks just what we need on 146 - I run the DG8 from GM3SEK but is no longer available - I'll update the wiki.
We can put the filter designs on the wiki for all to enjoy.
Noel
All looks great - it would make a good CQ-TV article
Don't know how I'd missed the PGA144 from Sam, looks just what we need on 146 - I run the DG8 from GM3SEK but is no longer available - I'll update the wiki.
We can put the filter designs on the wiki for all to enjoy.
Noel
Re: Success Stories
The filters look pretty good.
The Blue is the BPF and the Purple the LPF.
I'll draw a quick schematic of the filters and post them here.
Mark
G0MGX
The Yellow is the PGA144 with 20dB attenuation on the tracking generator - so the gain is 20dB. The notch is supposed to be 98MHz but mine is at more like 92MHz so it's all just a little bit "low" but will be OK as-is I think.The Blue is the BPF and the Purple the LPF.
I'll draw a quick schematic of the filters and post them here.
Mark
G0MGX
Re: Success Stories
I have mine nearly working now it is in a case. At the moment, the 2m performance isn't good, I can't demodulate the transmissions. 70cm is better and 23cm good. Performance improves at higher symbol rates. 70cm 333ks has a wide spread in the constellation, so time for trouble shooting. I am concerned the switching PSU I used may be injecting noise onto the power lines.
Incidentally. I had not updated for some time. When I came to test after updating I had a few issues. I used the reset to defaults option and this fixed it.
I will post a picture. We need a better way to mount the touch screen - that has proven the most difficult part of the project. My first screen didn't work properly for touch.
Mike
Incidentally. I had not updated for some time. When I came to test after updating I had a few issues. I used the reset to defaults option and this fixed it.
I will post a picture. We need a better way to mount the touch screen - that has proven the most difficult part of the project. My first screen didn't work properly for touch.
Mike
Re: Success Stories
Mike
Are you using a new Serit tuner? You might want to check that your phase noise problems are not in the receiver first. Put a 10dB pad on the tuner input and see if it improves matters at 70 cm and 146.
Yes, I'm about to need a bezel. Flat to an Aluminium panel. Has anyone on the Forum got a successful 3D print design for this?
Dave
Are you using a new Serit tuner? You might want to check that your phase noise problems are not in the receiver first. Put a 10dB pad on the tuner input and see if it improves matters at 70 cm and 146.
Yes, I'm about to need a bezel. Flat to an Aluminium panel. Has anyone on the Forum got a successful 3D print design for this?
Dave