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hirschhs
Flying Brick Rider
Joined: 28 Dec 2006
Posts: 343
Location: Bucks, UK
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 Posted: Sat Aug 22, 2009 11:59 am Post subject: fm transceivers |
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bought a couple of nice handheld fm transceivers when i was in china, about £60 for a pair with spare ear phones and mikes, chargers etc etc. Great. they work brilliantly but I would like to understand them better. Does anyone know where I can find an idiots' guide to such gadgets? It's true that I could just keep them both on the same channel and never adjust anything but I'd like to be able to do more than that.
As a footnote, we've tried various cheap solutions for bike to bike but these are great in terms of clarity, distance, comfort. Anyone in the UK wants some, I'll probably be back in china in sept, happy to pick some up.
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Cheers, Steve H _______________________________________
K-less in Bucks
2001 ST1100A
1994 Yamaha 600 Diversion 'Hers'
2006 Kawasaki Z750s 'Hers'
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Tim (Midland Section)
Flying Brick Rider
Joined: 08 Apr 2005
Posts: 960
Location: Pinxton, Nottingham, England.
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| Posted: Sat Aug 22, 2009 2:34 pm Post subject: |
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Steve, post make, model etc. Are they PMR446? Many people use them for bike to bike. We use them on club runs between leader & tail end. Once I / we know what you have, the info will flood in.
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Grey haired riders don't get that way by pure luck
1996 Guzzi Cali3 LAPD
1972 750 Commando
G6HRN
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hirschhs
Flying Brick Rider
Joined: 28 Dec 2006
Posts: 343
Location: Bucks, UK
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| Posted: Sun Aug 23, 2009 5:17 am Post subject: |
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Pu Guang P-G 708
frequency range VHF: 136-173.995mhz UHF: 400-469.999mhz
199 channels
output power: 5W
frequency modulate
max frequency offset: Wide band <+5khz Narrow band< 2.5
remain wave radiation: <-60dB
transmit current: <800mA
sensitivity <0.20uV(12dB SINAD)
squelch sensitivity <0.20uV
intermodulation antijamming 50dB
audio distortion: >400mW
receive current: <120mA
I know how to 'work' them but I don't know enough about frequencies, channels (what's the difference?) and various terminology such as squelch , CTCSS/DCS
Seems to be a bit like cricket or the stock exchange: if you don't find out when you're young, you've had it!
Any Revelations on the Secret Mysteries of the Transceiver gratefully noted. 
_________________
Cheers, Steve H _______________________________________
K-less in Bucks
2001 ST1100A
1994 Yamaha 600 Diversion 'Hers'
2006 Kawasaki Z750s 'Hers'
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Jim
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Tim (Midland Section)
Flying Brick Rider
Joined: 08 Apr 2005
Posts: 960
Location: Pinxton, Nottingham, England.
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| Posted: Sun Aug 23, 2009 7:37 pm Post subject: |
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| hirschhs wrote: | Pu Guang P-G 708
frequency range VHF: 136-173.995mhz UHF: 400-469.999mhz
I know how to 'work' them but I don't know enough about frequencies, channels (what's the difference?) and various terminology such as squelch , CTCSS/DCS
Seems to be a bit like cricket or the stock exchange: if you don't find out when you're young, you've had it!
Any Revelations on the Secret Mysteries of the Transceiver gratefully noted. |
Ok Steve, the deleted bits you don't need to know. They seem to be PMR (private mobile radio) / Radio ham. They are illegal in most countries without a relevant licence. You could indeed give them to me as I have said licence (G6HRN). However if you used them set in the 446 area no-one would ever know. I shall research & find correlation between PMR 446 numbering & frequency readout. Channels are a way for multiple users to use a common frequency using CTCSS. From Wiki:- http://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System
Continuous Tone-Coded Squelch System or CTCSS is a circuit that is used to reduce the annoyance of listening to other users on a shared two-way radio communications channel. It is sometimes called tone squelch. Where more than one user group is on the same channel (called co-channel users), CTCSS filters out other users if they are using a different CTCSS tone or no CTCSS.
Instead of turning on the receive audio for any signal, the two-way radio receiver's audio turns on only in the presence of a signal AND the correct tone. This is akin to the use of a lock on a door. A carrier squelch or noise squelch receiver is unlocked and will let any signal in. A receiver with CTCSS locks out all signals except ones encoded with the correct tone. CTCSS can be regarded as a form of in-band signalling.
Squelch (not to do with sloppy mud). with this set too low the receiver will emit annoying white noise. Turn squelch until the noise just stops. If turned too far then it will only allow STRONG signals through.
DCS = NFI (no idea)
HTH
_________________
Regards Tim,
Grey haired riders don't get that way by pure luck
1996 Guzzi Cali3 LAPD
1972 750 Commando
G6HRN
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hirschhs
Flying Brick Rider
Joined: 28 Dec 2006
Posts: 343
Location: Bucks, UK
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| Posted: Mon Aug 24, 2009 5:10 am Post subject: |
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thanks very much Tim. That clears up a lot of questions..
I shall look into the license thing; like to keep on the right side of the law 
similar Jim thanks, I'll check their manual.
_________________
Cheers, Steve H _______________________________________
K-less in Bucks
2001 ST1100A
1994 Yamaha 600 Diversion 'Hers'
2006 Kawasaki Z750s 'Hers'
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Jim Brotherton
Flying Brick Rider
Joined: 12 Nov 2006
Posts: 233
Location: Nieuwegein Netherlands
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| Posted: Tue Aug 25, 2009 1:23 pm Post subject: Re: fm transceivers |
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| hirschhs wrote: | bought a couple of nice handheld fm transceivers when i was in china, about £60 for a pair with spare ear phones and mikes, chargers etc etc. Great. they work brilliantly but I would like to understand them better. Does anyone know where I can find an idiots' guide to such gadgets? It's true that I could just keep them both on the same channel and never adjust anything but I'd like to be able to do more than that.
As a footnote, we've tried various cheap solutions for bike to bike but these are great in terms of clarity, distance, comfort. Anyone in the UK wants some, I'll probably be back in china in sept, happy to pick some up. |
When would you be back in England, Sept time frame?
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hirschhs
Flying Brick Rider
Joined: 28 Dec 2006
Posts: 343
Location: Bucks, UK
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| Posted: Tue Aug 25, 2009 1:47 pm Post subject: |
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Jim I'm not exactly sure when I'm going, they have suggested the 28th Sept for maybe 4 days.
However, I'm riding to Moenchengladbach again early Sept. it can't be more than 2 hrs to Nieuwegein can it?
Be happy to show you the gear if we can hook up.
_________________
Cheers, Steve H _______________________________________
K-less in Bucks
2001 ST1100A
1994 Yamaha 600 Diversion 'Hers'
2006 Kawasaki Z750s 'Hers'
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Jim Brotherton
Flying Brick Rider
Joined: 12 Nov 2006
Posts: 233
Location: Nieuwegein Netherlands
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| Posted: Tue Aug 25, 2009 3:38 pm Post subject: |
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I'll send you a PM
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2004 R1150RT |
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