Fusion half-deviation mode

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n8lbv
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Fusion half-deviation mode

Post by n8lbv »

Hi,
What exactly is the purpose of Yaesu Fusion C4FM half deviation mode?
My understanding is that newer radios have it and older C4FM radios do not.
*Quick* google searches are not turning up any information.
We are all speculating what it *might* be used for but where is Yaesu's explanation of this feature?
Thanks!

Steve N8LBV
I feel more like I do now.

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HA2NON
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Re: Fusion half-deviation mode

Post by HA2NON »

Newer radios don't have the setting as they are only operate in half deviation mode which uses less RF bandwidth (6.25 kHz instead of 12.5 kHz) Original C4FM specs by Yaesu use 12.5 kHz deviation, that's why they call it half deviation.
Norbert "Nonoo" Varga, HA2NON
SharkRF Team

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n8lbv
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Re: Fusion half-deviation mode

Post by n8lbv »

So Yaesu makes a new (narrower) band radio that does not have (12.5 wider) deviation mode in order
to match and interrop with their older radios?
That seems strange.
Why did they make this change and tdo they document the reasoning behind it?

So in summary:

Yaesu had the older 12.5 specification.
They switched to a newer narrower band spec.
I'm guessing they do not interrop (optimally) are mismatched to be used with each other.
New radios do not have the setting (therefore can't be used full deviation mode)?

Or do some radios have both modes?

Thanks jsut trying to learn and understand better.
I do not yet own any C4FM equipment, if I did I would know more about it.
I'm finding that people who I meet that have these are not able to explain the difference
or why the difference is there.

73
I feel more like I do now.

wilko
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Re: Fusion half-deviation mode

Post by wilko »

C4fm on my ft1d appears to be:

(DN) 12.5khz shared between voice and data (gps etc) hence 6.25khz voice, 6.25khz data

(VW) - broadband 12.5khz voice, no data

FT-70d doesn't have GPS, and doest have a data transfer function (images etc), hence maybe just the 6.25khz for the voice in DN mode, without the added data part in the bandwidth.

badukon
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Re: Fusion half-deviation mode

Post by badukon »

1) I have a YAESU FT2DR can anybody give me directions how to set half-deviation mode?

2) I am confused with the manual. Can anybody tell me what I have to do (which part of manual should I use) to connect FT2DR with DMR and then with D-STAR?
Thank you.

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HA2NON
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Re: Fusion half-deviation mode

Post by HA2NON »

1. Hold DISP button, TX/RX > Mode > Half deviation
2. Look at the Using cross modem modes section. Also if you want to use the Homebrew connector with your radio then look at the Homebrew connector settings (particularly the Using a C4FM radio section)
Norbert "Nonoo" Varga, HA2NON
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cyberblob
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Re: Fusion half-deviation mode

Post by cyberblob »

Hate to drag up an old post but I just had to add this comment because I keep getting this question.

To disable half deviation on say the FT-70D and to put it into normal mode.
Press and hold "F" move knob to menu item 62 "W/N.DEV" Press "F" move knob to "Wide" Press PTT
This fixes this for the OpenSpot to use normal C4FM so it will be compatible with all the rest of your YSF C4FM radios on the OpenSpot.

mi3vfj
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Re: Fusion half-deviation mode

Post by mi3vfj »

I have an ft991a can I get half deviation mode?

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HA2NON
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Re: Fusion half-deviation mode

Post by HA2NON »

Check it's user manual. Half deviation mode is not recommended to use with the openSPOT, so if your radio supports it, turn it off.
Norbert "Nonoo" Varga, HA2NON
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