Hetrodynes... does it happen with...

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KC9UZB
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Hetrodynes... does it happen with...

Postby KC9UZB » Tue Sep 04, 2007 1:43 pm


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Re: Hetrodynes... does it happen with...

Postby Wowbagger » Tue Sep 04, 2007 2:56 pm

First of all: VOCODERS ARE NOT PROTOCOLS! You are using some protocol which uses IMBE as a protocol (e.g. you are using APCO-25 CAI). Saying you are using "IMBE" is like saying you are using "big".

If anything - analog or digital - interferes with a digital protocol, then the result will be that the error rate will increase.

If the error rate does not exceed the forward error correction coding's ability to correct it, you hear no change in your signal. That's what is great about using digital protocols with FEC.

If the error rate does exceed the forward error correction coding's ability to correct it, you will either hear garbage or silence - depending upon the protocol's ability to detect the fact that it is having uncorrectable errors and how the protocol handles such cases.

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Postby motorola_otaku » Tue Sep 04, 2007 3:59 pm

And the sign says you got to have a membership card to get inside.

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Postby KC9UZB » Tue Sep 04, 2007 4:58 pm


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Postby Wowbagger » Tue Sep 04, 2007 5:50 pm


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Postby KC9UZB » Wed Sep 05, 2007 4:12 am


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Postby KB9SXK » Wed Sep 05, 2007 8:42 am

D Star?
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Postby KC9UZB » Thu Sep 06, 2007 12:28 pm

Back on topic.

Does transmit deviation matter for P25? I just thought, if I'm using 2.5kHz deviation and my mate is using 5kHz, does it matter? (apart from bandwidth use??)

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Postby Josh » Thu Sep 06, 2007 1:51 pm


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Postby KC9UZB » Thu Sep 06, 2007 2:29 pm


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Postby Wowbagger » Fri Sep 07, 2007 7:25 am


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Postby mr.syntrx » Fri Sep 07, 2007 7:30 am


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Postby KC9UZB » Fri Sep 07, 2007 10:16 am

Ok I guess I mean channel width. I'll just leave it as is then for now, it works. :p

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Postby n3jfw » Fri Sep 07, 2007 4:17 pm

N3JFW 4:29 pm
(4:29:48 PM): so he's gay huh
(nameless ham) 4:30 pm
(4:30:02 PM): haha no, but he is a music major
N3JFW 4:30 pm
(4:30:15 PM): so he's still in the closet

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Re: Hetrodynes... does it happen with...

Postby Mark_UK » Sun Mar 31, 2013 5:54 pm

You're not the only Amateurs in the UK using p25 ...
theres at least 3 of us 'round here, and we're growing :)

Mark

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Re: Hetrodynes... does it happen with...

Postby escomm » Tue Apr 02, 2013 4:13 am

After 6 years I'd certainly hope so :baby:
I'd hit it so hard you'd have to be to King of England to pull me out

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What radios do you own?: Motorla MX 1000s, Motorola GP300s, Motorola CP040, Motorola MTS2000, Motorola XTS 2500 model 3, Motorola Astro Spectra, Philips Simoco FM1100 UHF / Low band, Simoco TETRA Handheld, also various other Amateur SSB & HF transceivers

Re: Hetrodynes... does it happen with...

Postby Mark_UK » Fri Apr 12, 2013 6:46 am

Yup, there's nothing like a good necro-post :)

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Re: Hetrodynes... does it happen with...

Postby KC9UZB » Mon Jul 15, 2013 9:29 am

Damn Mark. Where abouts are you? I'm about 4000 miles to the west.


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