Traditionally, VHF repeaters in the US use around 5 kHz deviation. On
the HF bands, 2.5 kHz is used to comply with FCC regulations:
S 97.307 Emission standards.
...
(f) The following standards and limitations apply to
transmissions on the frequencies specified in S 97.305(c)
of this Part.
(1) No angle-modulated emission may have a modulation
index greater than 1 at the highest modulation frequency.
In section 97.305(c), note (1) applies to all amateur frequencies below 29.0
MHz. I think they most people use 5 kHz for 10 meter repeaters above 29 MHz.
Al N1AL
On Mon, 2008-05-05 at 16:28, Ken Kopp wrote:
> I'm a retired career two-way radio tech and I'll
> add a "me too" to Joe's FM-mode observations
> below. He's correct.
>
> 73! Ken Kopp - K0PP
>
>
> I no longer work in the 2-way field... so I don't
> have easy access to a Communications service monitor,
> but I can say that on-air tests on a 6-meter repeater
> bear out the lack of audio... When I worked in a
> Motorola shop (half-a-lifetime ago)we used to shoot
> for a CTCSS deviation of between 450 and 600Hz...
> and Josh is right on with his comment regarding
> a target voice deviation of 5.5KHz. I also agree
> that the squelch needs some work... As the operator
> at the far end during my on air testing commented...
> "You'll need a lot more audio if you expect to work
> anyone in a mobile who may be riding with the windows
> open!"
>
> I am certain that these problems will be addressed in a
> subsequent firmware update... and hope it will be soon.
>
> 73,
>
> Joe - W1AIU
>
>
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