[Boatanchors] Band Width

[David C. Hallam]

I tried to be polite in my question about band width.  To put it 
pointedly, my problem is with the XE stations that splatter all over any 
band they are operating in.  I use a 75S-3 and can hear the noise many 
KHz away from their operating frequency.  I am sure they are using a 
over driven big linear.  It's certainly annoying when they are operating.

David
KW4DH

On 12/21/2014 10:04 PM, ebjr37 at charter.net wrote:
> Dear Davaid et al:
>
> The FCC has very vaguely stated something about the bandwidths and,
> that they said to look at the figures in FCC part 2.  The emission
> indicators are specified for a broad range of bandwidths for all
> emissions including SSB.  (Which, as I recall specifies 2.8 khz for
> the "channel width" including a small guard band on both ends of the
> channel.  Very often the center of the channel is specified rather
> than the suppressed carrier frequency, so if you goto FCC part 2,
> don't get confused.  This is evident, in the frequencies of the 60
> meter channels, which has coinfused some people.
>
> Nothing "absolute" is specified in Part 97, just alluded to!
> Theoretically, what the SSB "hifi" guys are doing broadening the
> channels is most certainly not legal, because of the vagueness of
> "channel width" by Part 97.  AM modulation, as per the old definition
> for .55-1.7 Mhz broadcast emissions is covered in part 2 but the
> "hi-fi SSB" people are "stretching the point" here and they are WAY
> PAST the "normal" SSB bandwidth as specified by manufacturers of
> amateur gear which the "Hi-FI SSB" bunch is violating, for SSB emissions.
>
> Anything that causes a broader than normal SSB bandwidth (about
> 2.6-2.7 Khz) is theoretically not pedmitted.  This is what standard
> the transceiver manufacturers are required to
> meet......however.......if a linear amplifier is overdriven by the
> exciter transmitter, the spurious emissions will exceed the 2.8 khz
> channel width permitted by FCC part 2. This makes "splatter" or other
> distortion products that cause the bandwidth to be exceeded for SSB,
> which is thereby knowingly known, (or should be known to the violator,
> in the case of the "Hi-fi SSB" groups, and most definitely known to
> "QRMers"!  A violation in either case.
>
> I assume this was not more strictly adhered to when Part 97 was
> drafted. WHY?  Maybe because there isn't any "real engineers" left in
> the FCC, or just plain too many political hacks, and bean counters,
> and lawyers who are not interested in "theoretical" things?
>
> As an ARRL "Official Observer" I am alarmed.  But what to do now as
> the bandwidth requirements are so vaguely referred to by Part 97!!
> This leaves us in a quandry.  Should the "League" pressure the
> Commission to rewrite part 97 and be more specific as should have been
> done from the beginning?  Frequency tolerance and bandwidths have
> gotten more and more "precise" since we old timers were using vacuum
> tube equipment!  Is there and aid to possibly having FCC monitoring
> stations like there used to be?  Maybe the budget will not permit it?
> This needs to be attended to before it gets completely "out of hand"
> and will be very hard to implement in the future?
>
> 73 to all,
>
> Sandy Blaize W5TVW
> Amateur Extra Since 1968
> 2nd Class Ship Telegraph license since 1968
> First license was an Amateur Novice in 1951
> Was active for many years maintaining ship radio and radar equipment,
> including INMARSAT satellite gear
> Also active in the Air National Guard maintaining avionics equipment
> for 15 years.
>
>
>
> On Sun, Dec 21, 2014 at 10:57 AM, David C. Hallam wrote:
>
>> Are there any regulations that specify the maximum band width of ssb
>> transmissions for amateur radio stations south of the border?
>>
>> David
>> KW4DH
>>
>> --
>> There are two possible outcomes: if the result confirms the
>> hypothesis, then you've made a measurement.
>> If the result is contrary to the hypothesis, then you've made a
>> discovery.
>> Enrico Fermi
>>
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-- 
There are two possible outcomes: if the result confirms the hypothesis, 
then you've made a measurement.
If the result is contrary to the hypothesis, then you've made a discovery.
Enrico Fermi