DAB Transmitter

Everything technical about radio can be discussed here, whether it's transmitting or receiving. Guides, charts, diagrams, etc. are all welcome.
Post Reply
ronald001
who u callin ne guy bruv
who u callin ne guy bruv
Posts: 38
Joined: Sun Jan 17, 2016 1:49 pm
Location: Netherlands

DAB Transmitter

Post by ronald001 » Tue Feb 04, 2020 2:17 pm

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
tower block dreamin
tower block dreamin
Posts: 371
Joined: Fri Aug 26, 2016 7:01 pm

Re: DAB Transmitter

Post by radium98 » Tue Feb 04, 2020 6:36 pm

good work ,on what frequency is it SET

radium98
tower block dreamin
tower block dreamin
Posts: 371
Joined: Fri Aug 26, 2016 7:01 pm

Re: DAB Transmitter

Post by radium98 » Wed Feb 05, 2020 7:25 am

You do not have the required permissions to view the files attached to this post.

RF-Head
no manz can test innit
no manz can test innit
Posts: 177
Joined: Wed Oct 15, 2014 9:25 pm

Re: DAB Transmitter

Post by RF-Head » Wed Feb 05, 2020 8:28 am

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

ronald001
who u callin ne guy bruv
who u callin ne guy bruv
Posts: 38
Joined: Sun Jan 17, 2016 1:49 pm
Location: Netherlands

Re: DAB Transmitter

Post by ronald001 » Wed Feb 05, 2020 10:04 am

PM sent

ronald001
who u callin ne guy bruv
who u callin ne guy bruv
Posts: 38
Joined: Sun Jan 17, 2016 1:49 pm
Location: Netherlands

Re: DAB Transmitter

Post by ronald001 » Wed Feb 05, 2020 10:09 am

radium98 wrote:
Tue Feb 04, 2020 6:36 pm
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
You do not have the required permissions to view the files attached to this post.

radium98
tower block dreamin
tower block dreamin
Posts: 371
Joined: Fri Aug 26, 2016 7:01 pm

Re: DAB Transmitter

Post by radium98 » Wed Feb 05, 2020 4:58 pm

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

User avatar
teckniqs
proppa neck!
proppa neck!
Posts: 2408
Joined: Thu Aug 21, 2014 11:37 am

Re: DAB Transmitter

Post by teckniqs » Sat Feb 08, 2020 10:11 am

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

User avatar
thewisepranker
tower block dreamin
tower block dreamin
Posts: 473
Joined: Fri Aug 22, 2014 12:53 pm
Location: Brighton

Re: DAB Transmitter

Post by thewisepranker » Sat Feb 08, 2020 8:48 pm

It's relatively clean but a filter before the PA wouldn't hurt.
You do not have the required permissions to view the files attached to this post.

User avatar
teckniqs
proppa neck!
proppa neck!
Posts: 2408
Joined: Thu Aug 21, 2014 11:37 am

Re: DAB Transmitter

Post by teckniqs » Sat Feb 08, 2020 11:23 pm

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

RF-Head
no manz can test innit
no manz can test innit
Posts: 177
Joined: Wed Oct 15, 2014 9:25 pm

Re: DAB Transmitter

Post by RF-Head » Sun Feb 09, 2020 9:01 am

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

User avatar
teckniqs
proppa neck!
proppa neck!
Posts: 2408
Joined: Thu Aug 21, 2014 11:37 am

Re: DAB Transmitter

Post by teckniqs » Sun Feb 09, 2020 2:33 pm

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

ronald001
who u callin ne guy bruv
who u callin ne guy bruv
Posts: 38
Joined: Sun Jan 17, 2016 1:49 pm
Location: Netherlands

Re: DAB Transmitter

Post by ronald001 » Mon Feb 10, 2020 3:42 pm

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..

Post Reply