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

2008-05-05 Thread Ken Kopp 

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

2008-05-05 Thread 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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Re: [Elecraft] FM test results - not good for U.S.

2008-05-05 Thread Ken Kopp 

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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