DAB Transmitter

[ronald001]

For the ones that are interested in DAB transmission:

I started experimenting with an EasyDAB modulator, and made a short movie of my setup



I believe that FreeDAB ireland is using the same modulator.

Next step is to build an antenna, and possibly an extra amplifier

[radium98]

good work ,on what frequency is it SET

[radium98]

https://i.ibb.co/mXbKkKy/IMG-20200202-135313.jpg

https://ibb.co/YtLWzb8

[RF-Head]

@Ronald
I have a DAB amplifier for sale
20dBm input (100mW) and 300-400W output
H

[ronald001]

PM sent

[ronald001]

good work ,on what frequency is it SET

DAB.PNG

Channel 13C, which is outside of the Dutch Broadcast band.
Fortunately the range of DAB radio's is 5A - 13F

[radium98]

thanks ronald001 ,i am so far from this project ,but just some infos .

[teckniqs]

My only concern is if that little thing is clean enough to be able to go into a 300 to 400w amp??

....Reminds me of a Raspberry Pi

[thewisepranker]

It's relatively clean but a filter before the PA wouldn't hurt.

[teckniqs]

But sounds like it probably would if it wasn't...

[RF-Head]

Shoulders on -40dB is good when after the amplifier
If you lower the output of the modulator it's mutch cleaner (to about 0dBm)
We use a mask filter after the amplifier

[teckniqs]

OK fair enough. I'm interested to hear how he gets on with it.

[ronald001]

Planning to make a stacked 3 element gammamatch dipole setup - but am waiting for my NanoVNA-H.

Already did some testing with my CD-95Y Log-Per, that has an unexpected good SWR @ 234Mhz!
Not sure if it still performs good at this frequency - but got a 2Km range with 1,5 Watt @ 7 Meters antenna hight.

Not bad if you ask me..

[ronald001]

Here is the antenna designed with YagiCAD - Crosschecked with 4NEC2 and analyzed with the impressive but very cheap NanoVNA

Below 1:1.5 from 220 - 240 Mhz