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http://www.universal-radio.com/catalog/ ... /0281.html

Looks pretty nifty. I like the front-firing speaker.

Will it do 12.5?

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Interoperability is an attitude, not a technology.

Yes.

Transmit in Narrow Mode or able to transmit on 154.2575? I'm finding that the distinction is not as clear. My TH-F6A says it's Narrowband capable but won't transmit on something like 154.2575.

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Interoperability is an attitude, not a technology.

I think you're getting some terminology confused.

N-FM (on the F6A) refers to the TX deviation. Normal FM deviation is 5khz wide where as the N-FM deviation is only 2.5khz wide. If you had two identical radios and transmitted in N-FM on one and listened on the other (via simplex) then you'd hear the audio coming thru -- but it would be clipped a bit.

NBFM refers to the spacing of channels. Normal FM spacing is 25khz and NBFM refers to 12.5khz spacing. The deviation for wide is 5khz and narrow is 2.5khz.

NBFM is targetted at only the 150-174 and 421-512 Mhz ranges. So amateur radios have no real need for it.

There's another Super-NBFM spec that will eventually make 6.25 khz channels but I'm not sure if there's any real movement on that yet.

My guess is that the F6A doesn't support the 12.5khz steps while in the TX portion of the amateur bands -- since there's no need for it.

PS. I found a short, simple outline of what NBFM means: http://www.megalink.net/~oxctyema/narro ... tation.pdf

I just realized you said 154.x and not 145.x -- is your F6A modified for out of band TX? Oh and remember the channel spacing is fixed.


154.2000
xxx.2125
xxx.2250
xxx.2375
xxx.2500
xxx.2625
xxx.2750

Ah ha..you did catch that. I figured you would and actually though about going back and fixing that after I posted.

What I was trying to do was set my TH-F6A to RX on 154.2575 but it would only go to 154.255 or 154.260 -- 25Khz steps, so I guess I lied, or got confused in my first post. I had someone tell me that they'd modify it for me and my reply was, "I still wouldn't be able to TX on 158.9175 (the in to the main FD repeater) so it wouldn't do me any good anyways."

As you put deviation vs. channel spacing; that's how I understood it and thanks for the clarification and the relief to me that I had taught myself correctly :party: That does now also make sense why amateur stuff doesn't have the capabilities to TX on .2575. I just wish somebody would come out with an affordable true tri-band portable but I'm afraid it's just a pipe dream. (How much does a Liberty cost these days anyways?)

As part of a school project, I did a presentation on Kenwood's Nexedge and the theory behind 6.25 KHz. Let alone the fact that they're digital, it was still interesting to come to find out how simple very-narrowband is. I did too also find that there real is no push to go to very-narrowband but it is a thing of the future.

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Interoperability is an attitude, not a technology.

You can transmit on 158.9175 with an Icom 7000 thanks to the 100 hz steps! :)

My Moto XTS 5000R can do this! 8)

Didn't I solve this for you before?



To be fair, you were asking for quad-band the last time; somewhere in between you've lowered your standards to tri-band.

2m, 220, 70cm and ??

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Interoperability is an attitude, not a technology.

Mine is VHF only JRW. ;)

I knew better...

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Interoperability is an attitude, not a technology.

I'm wondering if it receives anything above 150 in NB or their 'technical' writer got carried away. How does it do on two meaters?

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"I was installing un-programmed radios"

Mmmmmmmmm! 2 meaters! :D
Old Angus loves 2 meaters :beer:

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" SILENCE IS CONSENT "

Made to Government Specs:
1) Measured with a micrometer.
2) Marked with a chalk.
3) Cut with an axe.

Jim N7UAP - Bellingham, WA / InterceptRadio.com