[cma-l] AM community
Ian Hickling
transplanfm at hotmail.com
Wed Sep 16 20:34:54 BST 2015
Ofcom will only normally license 70W EMRP for an AM CR.Because of the low level of antenna efficiency ( 8 to 10%) the port output power of the transmitter will need to be around 1000W and the ATU will need to be able to handle this level of RF power.Thinking small power, small antenna and small propagation confidence will assuredly produce small coverage and small chance of commercial viability!Just 6 of the total of 233 CR licences issued and currently in operation use AM - 2 with 100W EMRP - 2 with 70W, 1 with 4W and one with 1W.The phrase "Success Story" does not come to mind naturally.
Ian Hickling
Partner
Office: 01635 578435 (7am-11pm UK time)Carphone: 07530 980115 (only responds when driving)6 Horn Street, Compton, NEWBURY, RG20 6QS
To: cma-l at mailman.commedia.org.uk
From: office at fantasyradio.co.uk
Date: Wed, 16 Sep 2015 10:26:33 +0100
Subject: [cma-l] AM community
Admittedly, an AM aerial is more awkward than FM, if only because of
its size! and much less predictable. 1 kilowatt would be nice - but
Ofcom wouldn't licence that power for a community station.
1 watt is the norm for RSLs. Even with a pretty inefficient aerial
system, a 50 watt transmitter would be ideal.
Very few of the 'big' AM stations have anything like that power.
As an example, Sunshine in Ludlow has a remarkable footprint, and
locally an excellent signal, even after dark. Their emrp is
160watts, the original transmitter putting 600 watts up the coax.
As we're discussing community AM, think small - it can be
beautiful.
Phil Dawson
FANTASY RADIO 97FM
Devizes
Wiltshire.
On 9/15/2015 6:25 PM,
cma-l-request at mailman.commedia.org.uk wrote:
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Today's Topics:
1. AM community radio (Ian Hickling)
2. Re: AM community radio (Alan Coote)
3. Re: AMCR - SDR (Andy Clarke)
----------------------------------------------------------------------
Message: 1
Date: Tue, 15 Sep 2015 16:10:43 +0000
From: Ian Hickling <transplanfm at hotmail.com>
To: The Community Media Association Discussion List
<cma-l at mailman.commedia.org.uk>
Subject: [cma-l] AM community radio
Message-ID: <DUB125-W86A31ED1BBCC08ED10A79DAD5C0 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
PhilI'm not denying at all that AM has its advantages and uses - and believe me I wasn't being negative - just very down-to-earth practical
We've run AM RSLs with a guyed 18m pole with a top hat - and we have one CR running with the ?3500 classic Radica hinged plastic flagpole antenna.But we're talking here about a minimum ?15,000 investment a for a 5-year contract with the absolute requirement of being able to sell lots of airtime on a robust reliable signal.
So - if you can produce a 1kW transmitter that will perform to Ofcom's satisfaction and an ATU that will handle that - you have a customer sitting here waiting.
Ian Hickling
Partner
Office: 01635 578435 (7am-11pm UK time)Carphone: 07530 980115 (only responds when driving)6 Horn Street, Compton, NEWBURY, RG20 6QS
Date: Tue, 15 Sep 2015 13:52:18 +0100
From: office at fantasyradio.co.uk
To: cma-l at mailman.commedia.org.uk
Subject: [cma-l] AM community radio
Afternoon all,
For what it's worth, my own experience with AM is that you can get some
astonishing results! For several RSLs I have used a wire antenna, (an
inverted L) to great effect. The Earth mat consisting of wire netting
laid on the ground. Height is might as always, but even with only 20
metres, we were getting into Europe! I have reception reports to prove
it. I have also used a single 1 1/4" tube steel mast, with a 'top hat'
to increase top capacitance. I believe Radica used to do AM antennae
using a lamp post. (you can get a lamp post for about ?300) The
standard RSL AM licence is for 1 watt. This gives a similar coverage to
FM at 25watts. Oh yes, and I designed and built my own transmitters,
using valves!
Within the specified 5km radius for community radio, AM will do the job
nicely. (very important to get some good audio processing though) Also,
with fewer stations now on AM it could get better!
Anybody want to know more? mail me at phildawson at lemonmail.co.uk.
Phil Dawson
FANTASY RADIO97FM
Devizes
Wiltshire.
On 15/09/2015 12:00, cma-l-request at mailman.commedia.org.uk wrote:
Send cma-l mailing list submissions to
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You can reach the person managing the list at
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of cma-l digest..."
Today's Topics:
1. Re: AMCR - SDR (Associated Broadcast Consultants)
2. AMCR - SDR (Ian Hickling)
3. Re: Confession (Two Lochs Radio)
----------------------------------------------------------------------
Message: 1
Date: Tue, 15 Sep 2015 10:33:45 +0100
From: Associated Broadcast Consultants <info at a-bc.co.uk>
To: The Community Media Association Discussion List
<cma-l at mailman.commedia.org.uk>
Subject: Re: [cma-l] AMCR - SDR
Message-ID:
<CAG9-nrYO5ZHtH6B54QmMBYS1VZqzLaSJD39dX4W_jqJ_g95C3A at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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
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Message: 2
Date: Tue, 15 Sep 2015 17:31:11 +0100
From: Alan Coote <alan.coote at 5digital.co.uk>
To: "cma-l at mailman.commedia.org.uk" <cma-l at mailman.commedia.org.uk>
Subject: Re: [cma-l] AM community radio
Message-ID: <8375A376-BF44-4015-B7ED-84D8D8B34297 at 5digital.co.uk>
Content-Type: text/plain; charset="UTF-8"
Now that is proper radio! - Reminds me of shortwave station ?a friend? used to run. Got into Europe very easily until the tuning coil got a bit warn and set fire to his dad?s garden shed.
Anyway well done Phil!
Kind Regards
Alan
Alan Coote
Hear
Alan Every Week on Let?s Talk Business The UK?s Premier Radio Programme For
Current and Future Entrepreneurs - Now Broadcast To Over 7 Million People <http://www.letstalkbusinessonline.com/>
Email - alan.coote at 5digital.co.uk
Phone - 0800 949 6655
Mobile - 07801 518858
Twitter - @TheAlanCoote <http://www.twitter.com/TheAlanCoote>
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On 15/09/2015 13:52, "Fantasy Radio Office" <cma-l-bounces at mailman.commedia.org.uk on behalf of office at fantasyradio.co.uk> wrote:
Afternoon all,
For what it's worth, my own experience with AM is that you can get some
astonishing results! For several RSLs I have used a wire antenna, (an
inverted L) to great effect. The Earth mat consisting of wire netting
laid on the ground. Height is might as always, but even with only 20
metres, we were getting into Europe! I have reception reports to prove
it. I have also used a single 1 1/4" tube steel mast, with a 'top hat'
to increase top capacitance. I believe Radica used to do AM antennae
using a lamp post. (you can get a lamp post for about ?300) The
standard RSL AM licence is for 1 watt. This gives a similar coverage to
FM at 25watts. Oh yes, and I designed and built my own transmitters,
using valves!
Within the specified 5km radius for community radio, AM will do the job
nicely. (very important to get some good audio processing though) Also,
with fewer stations now on AM it could get better!
Anybody want to know more? mail me at phildawson at lemonmail.co.uk.
Phil Dawson
FANTASY RADIO97FM
Devizes
Wiltshire.
On 15/09/2015 12:00, cma-l-request at mailman.commedia.org.uk wrote:
Send cma-l mailing list submissions to
cma-l at mailman.commedia.org.uk
To subscribe or unsubscribe via the World Wide Web, visit
http://mailman.commedia.org.uk/mailman/listinfo/cma-l
or, via email, send a message with subject or body 'help' to
cma-l-request at mailman.commedia.org.uk
You can reach the person managing the list at
cma-l-owner at mailman.commedia.org.uk
When replying, please edit your Subject line so it is more specific
than "Re: Contents of cma-l digest..."
Today's Topics:
1. Re: AMCR - SDR (Associated Broadcast Consultants)
2. AMCR - SDR (Ian Hickling)
3. Re: Confession (Two Lochs Radio)
----------------------------------------------------------------------
Message: 1
Date: Tue, 15 Sep 2015 10:33:45 +0100
From: Associated Broadcast Consultants <info at a-bc.co.uk>
To: The Community Media Association Discussion List
<cma-l at mailman.commedia.org.uk>
Subject: Re: [cma-l] AMCR - SDR
Message-ID:
<CAG9-nrYO5ZHtH6B54QmMBYS1VZqzLaSJD39dX4W_jqJ_g95C3A at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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
_______________________________________________
Reply - cma-l at commedia.org.uk
The cma-l mailing list is a members' service provided by the Community Media Association - http://www.commedia.org.uk
Twitter: http://twitter.com/community_media
http://www.facebook.com/CommunityMediaAssociation
Canstream Internet Radio & Video: http://www.canstream.co.uk/
_______________________________________________
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------------------------------
Message: 3
Date: Tue, 15 Sep 2015 18:06:03 +0100
From: "Andy Clarke" <cma at severnfm.com>
To: "'The Community Media Association Discussion List'"
<cma-l at mailman.commedia.org.uk>
Subject: Re: [cma-l] AMCR - SDR
Message-ID: <03fb01d0efd8$ceb4e380$6c1eaa80$@com>
Content-Type: text/plain; charset="utf-8"
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
_______________________________________________
Reply - cma-l at commedia.org.uk
The cma-l mailing list is a members' service provided by the Community Media Association - http://www.commedia.org.uk
Twitter: http://twitter.com/community_media
http://www.facebook.com/CommunityMediaAssociation
Canstream Internet Radio & Video: http://www.canstream.co.uk/
_______________________________________________
Mailing list guidelines: http://www.commedia.org.uk/about/cma-email-lists/email-list-guidelines/
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