Sepura SRH3800 and DMO TG1?

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Sepura SRH3800 and DMO TG1?

Postby scanningleicester » Tue Apr 05, 2016 1:45 pm

Hi, so I got one of the decommissioned police radios a while back from eBay which (allegedly) has the DMO TG1, and National 430 channels tuned into it already. However from what I've heard, these channels are often not on the correct frequencies anyway and are virtually useless to use for anything. Is there anyway of checking what frequncy I'm on? Would I be able to hear others on these freqs without colour codes, etc. And is it "license free" as its made out to be?

Thank you for any and all help :smiles:

PS. Before anyone says, I am fully aware and always have been, that I will pick up no emergency services traffic whatsoever.
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Re: Sepura SRH3800 and DMO TG1?

Postby m0lsx » Tue Apr 05, 2016 3:20 pm

scanningleicester wrote: And is it "license free" as its made out to be?

Licence free frequencies are on 446 mhz, on 433 mhz & on 27 mhz. Each band has it's own specifications, as to what type of radio, power output etc etc is legal & the radio you own is not on any of the above frequencies, nor does it meet the specifications of any of the licence free bands even if it were put onto licence free frequencies.
Breeching the Wireless Telegraphy act carries penalties of up to £5000, plus up to 2 years imprisonment for each single offence. And using an unlicensed radio on someone else's legally licensed frequency would put you in breech of several sections of the act each time you did it.
Take a look at...http://www.edinburghnews.scotsman.com/news/transport/youth-trolled-airport-radio-and-taxi-networks-1-3687069

A TEENAGER has been arrested and charged on suspicion of “trolling” workers using private radio networks across the Capital.
The 18-year-old is suspected of intercepting several frequencies – including those at Edinburgh Airport and Edinburgh Castle – and making threatening and abusive comments.
He was detained for more than 20 offences under the Wireless Telegraphy Act, alleged to have taken place between June 2014 and... (Jan 2015)


So that 18 year old was potentially looking at £100,000 worth of fines, plus up to 40 years in jail. There is no need to talk, or cause any issues. The offences relate to owning or using the radio.
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Re: Sepura SRH3800 and DMO TG1?

Postby G4RMT » Tue Apr 05, 2016 4:43 pm

Can I side track. I just noticed Alan's comment on 433MHz as a license free band, and Googled. I had no idea that anyone can use radios in that band - the wiki channel numbers are clearly quite common amateur ones. My question is why are not the people finding PMR446 using them? Does this mean they can chat to hams?

I assumed the SRDs would be the usual door openers, car alarms and short range signalling stuff - I had never heard of it also being used for voice comms.

I've never seen any adverts for radios on these frequencies - do they exist?
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Re: Sepura SRH3800 and DMO TG1?

Postby m0lsx » Tue Apr 05, 2016 5:12 pm

G4RMT wrote:Can I side track. I just noticed Alan's comment on 433MHz as a license free band, and Googled. I had no idea that anyone can use radios in that band - the wiki channel numbers are clearly quite common amateur ones. My question is why are not the people finding PMR446 using them? Does this mean they can chat to hams?

I assumed the SRDs would be the usual door openers, car alarms and short range signalling stuff - I had never heard of it also being used for voice comms.

I've never seen any adverts for radios on these frequencies - do they exist?


As our licence specifies that we may only direct messages to other radio amateurs, or their stations. (11,2a.) I assume no we can't unless they are licensed.
Have you seen the 433 the channels?. Some are on repeater outputs!!!!
https://en.wikipedia.org/wiki/LPD433
I am not aware of any 433 specific radios, but I have seen duel 446/433 handhelds.
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Re: Sepura SRH3800 and DMO TG1?

Postby scanningleicester » Tue Apr 05, 2016 6:40 pm

So is there a digital/tetra version of 446 that would be legal to operate on? Or is it a waste of time really?
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Re: Sepura SRH3800 and DMO TG1?

Postby m0lsx » Tue Apr 05, 2016 8:34 pm

You may use what ever mode you want on 446. But to be legal it needs to be a 446 specific radio. However people use what ever they want & it seems that as long as you keep your head down & don't draw attention to yourself, there is no problems with that.
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Re: Sepura SRH3800 and DMO TG1?

Postby sjjmartin97 » Tue May 17, 2016 10:45 am

if my memory serves me right the dmo TG1 is on 420.125 and the national 430 is on 430.000. so only the national 430 is actually in the Ham band
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Re: Sepura SRH3800 and DMO TG1?

Postby SilverShadow » Wed May 18, 2016 9:50 am

Yep I could never understand why they decided to go along with those frequencies for LPD433. It was of course in agreement with the EU wide plan why it happened but it's still daft.

They are limited to 10mW which is very low power, where PMR446 gives you 500mW but the fact that they have been indiscriminate and used a mix of 70cm simplex, repeater inputs and repeater outputs is only going to cause problems, especially with people living on the doorstep of amateur repeaters.

There don't seem to be many models out there but the Intek MT-5050 & Intek MT-3030 seem popular and have both LPD433 (at 10mW) and PMR446 (at 500mW).

It would have been a lot more sensible if they gave them 6.25 spacing channels (rather than the current 25 spacing) and stuck them somewhere on 435MHz which is quiet compared to 433MHz which is the main 70cm band.
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