[Elecraft] FM test results - not good for U.S.

[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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