FM test results - not good for U.S.

[Ken Kopp-3]

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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[Alan Bloom]

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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[Ken Kopp-3]

Of course I'm sure there are exceptions, but I've not
been aware of traditional "5 kHz deviated" FM usage
on 10M frequencies below 29.0 mHz.  It simply a case
of the operator being aware of ... and following ... the
FCC's rules.

I expect/ed to be able to use "conventional" 5 kHz FM
deviation above 29.0 mHz when using my K3.

73! Ken Kopp - K0PP
       
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