[cma-l] AMCR - SDR

[Andy Clarke]

SDR is definitely the easy bit Glyn - one of my Hack RFs has been txing a  solid DAB signal now for 186 days (I still have 3)!! J

 

Kind Regards

Andy S Clarke

Managing Director - Ringtone.net Ltd.


 <blocked::http://www.ringtone.net/aboutus.html> http://www.ringtone.net/aboutus.html

cid:image003.png at 01D06D77.D7B3B940
Severn FM is a registered trademark of Ringtone.net Ltd, a company  Registered in England No. 4225273. 



 

 

 

 

From: cma-l-bounces at mailman.commedia.org.uk [mailto:cma-l-bounces at mailman.commedia.org.uk] On Behalf Of Associated Broadcast Consultants
Sent: 15 September 2015 10:34
To: The Community Media Association Discussion List
Subject: Re: [cma-l] AMCR - SDR

 

If anyone is interested I have Software Defined Radio for sale on Ebay at the moment.  I've used the same type of unit to run a DAB test multiplex.  I'm pretty sure I've recall that someone has already written the code to run it as a DRM transmitter.

http://www.ebay.co.uk/itm/HackRF-One-Software-Defined-Radio-NEW-Unopened-FREE-Postage-BARGAIN-/271983417851?hash=item3f537999fb

I can't help feeling though that the SDR is the "easy" part.  The difficult part is getting an efficient aerial system.

Glyn


-- 

Glyn Roylance - Principal Consultant 

Associated Broadcast Consultants <http://www.a-bc.co.uk/> 

 







 

On 15 September 2015 at 08:16, Tony Bailey <ravensound at pilgrimsound.co.uk> wrote:

Hello Marc et al,

I mentioned DRM on AM because it would be easily implemented in a software box.  I think the Talk 107 test used two programme channels on one FM carrier.  In fact the main issue with medium wave is getting a stable earth system without ploughing a field!  Antennas can be short (most RSLs use them) but they aren't very efficient due to being very small impedance compared to the ground.  As has been pointed out this isn't a problem if you can site the antenna in (or on) water.  I wondered if given that SDR requires an rf box maybe a clever designer could come up with a low impedance amp that could include matching directly connected to the vertical antenna sitting on a ground plane.

Regards,  Tony

 




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