29MHz trans Atlantic DX...

[radiogareth]

Good find Claudio, I wonder if that is US $ or Aus $....
Class A is only about the biasing point. A nicely laid out board though, you could trace the circuit from that. Just a question of which Ferrites to use for the required frequencies.
At those power levels you might as well build up one of the ref circuits for the MRF101 posted earlier. If 10 of you want an amp you can get a pack of the PCBs here http://dirtypcbs.com/store/designer/det ... -rev-b-zip
Maybe not JLC but they did deliver and the quality was fine.

You can view the freq specific designs here https://www.nxp.com/docs/en/data-sheet/MRF101AN.pdf

Gareth

[f1faq]

Hi,
I am following your tests, but I have problem to record the .wav file with the right BW (20Khz).
On the SDR (the US one) I can extend manually the BW up to 20Khz, have IQ is selected, but when reading the file by SDR Angel it says it is 12Khz BW, so the whole information is not recorded
What is the trick to force the record to be 20Khz wide ?
73's - Christian
F1FAQ

[g0mjw]

Not all of them do the full 20 kHz. Very few in fact. I have some wav file samples of my signal received over the Atlantic.

Mike

[K0ZAK]

Hi Guys, I've been working to get my 10 meter beam up on my tower over the last week. I finally got it up yesterday and the band looks to have collapsed.

Anyway, I have a Knucker receiver here just north of Baltimore Maryland, US and have an Upconverter feeding it so I can get it to tune down to 29mhz. I've also just figured out how to feed the output of the Knucker to my BATC streamer member page, so I could leave the whole thing on auto in case someone would like to try sending a DVB'T signal across the pond. I have nothing here that will decode narrow bandwidth DVB-S, as no one in the area seems to be interested in going that route. Maybe I'll need to build a MiniTiouner to run along side the Knucker?

John Kozak; K0ZAK

[g0mjw]

Very good John,

I would set it to the minimum usable bandwidth setting (I forget was it 150kHz ?) and decide on a frequency. Then we can try when conditions are good.

Mike

[K0ZAK]

The minimum on the Knucker is 250Khz as far as I can see. At least that is the lowest predefined button with the Portsdown 4 software that I am running with it. I've never gotten my Pluto to behave below 333Khz on the Knucker receiver, but that was on 439 Mhz anyway. As the Pluto won't go down to 29 Mhz, I have no way of verifying that this setup will work. I've currently got the setup looking at 29.150 Mhz @ 250 Khz bandwidth. So we can begin there. But not today. The cold front came in yesterday and 10 meters closed down here. I'll keep this setup for when the band opens again.

John Kozak: K0ZAK

[g0mjw]

I designed a converter to move 149 MHz to 29 MHz so no problem transmitting or receiving 250kS 29MHz DVB-T. I will have a go at setting up a TX but need to wait for conditions to improve. The C/N was only about 10 dB with 18ks so we might find signals are too weak, but worth a try.

Mike

[K0ZAK]

Mike,
I was just reading your thread on that converter working with the pluto. Have you posted the final info on that converter and circuit board anywhere? It sounds like I could use it with my pluto to verify my receive setup as well.

John Kozak; K0ZAK

[g0mjw]

Still waiting for a review from Gareth, I have sent everyone the Gerbers and Schematics. It was prone to oscillate when put in the box and I was hoping that was fixed, but perhaps not.

Mike

[M0DTS]

I believe the Knucker is good down to 333Ks but not lower so that will hamper our efforts unless conditions are very good!

For Christian i have attached an example of how i have got SDRAngel setup to receive my tests via the kiwisdr.
I've been using it in real time, not recorded.

So far I've only found K3FEF and EW/KO33SV kiwisdr receivers to have the 20KHz bandwidth.
SDRAngel uses my speaker output (stereo mix) as the input to demodulate the audio heard from the kiwisdr in IQ mode.
Sometimes you will need to enable stereo mix as a recording device in windows.

This was on the Belarus kiwisdr just now...

Rob