[Elecraft] 700 Hz roofing filters

[Gary Gregory]

I feel compelled to state my objection to any TX capability from ALL amateur
transceiver manufacturers to NEVER allow TX bandwidth in excess of
3Khz..period.

ESSB is unwarranted and a waste of bandwidth and creates havoc wherever it
is used.

In VK we have a small minority who insist on ESSB operation and whilst we
can all find alternative frequencies not suffering from QRM it should be no
surprise to all that sure enough, on 17M were two stations running ESSB on
18.130 or right in about the centre of the SSB portion of the band.

We all love to experiment with different modes but I have to admit I must be
pretty darn slow (or worse) as I do not see why EESB is worth experimenting
with.

But then I may be just too slow..or worse..to understand.

My 2c worth...keep the change
(Flame Suit on)

73's
Gary

On Wed, Sep 22, 2010 at 10:19 AM, Jeff Cochrane - VK4BOF <
vk4bof.elecraft at gmail.com> wrote:

> Hi Joe et al,
> I'm going to hazzard a guess here as to why Elecraft dont allow the 13KHz
> filter for AM/ESSB TX.
>
> Because it's illegal.
> SSB is called mode A3J in most of the legal documents that govern our
> hobby.
> The reason why the mode is called A3J in all the legal stuff is that the 3
> is the maximum bandwidth in khz that is permitted.)
> Thus, anything more than the 3KHz SSB bandwidth is against the laws that
> govern us.
>
> The F.C.C. in the US of A and here in Australia, A.C.M.A. both allow a
> maximum of 3KHz for SSB TX bandwidth on any HF band.
> So it would be a fair bet then that because the K3 is a FCC type approved
> radio that part of that type approval includes that it must not transmit SSB
> bandwidths that are wider than permitted.
>
> My $0.02c worth (Plus GST/VAT/Sales Tax as applicable)
>
>
> Jeff Cochrane - VK4BOF
> Innisfail, QLD, Australia
> Elecraft K3# 4257
>
>  ----- Original Message -----
>  From: Joe Subich, W4TV
>  To: elecraft at mailman.qth.net
>  Sent: Wednesday, September 22, 2010 9:44 AM
>  Subject: Re: [Elecraft] 700 Hz roofing filters
>
>
>
>  In general I agree with Wayne although I prefer to have a more
>  narrow bandwidth option for SSB (1.8 or 1.5 KHz).  In order to
>  make room for the 1.5/1.8 KHz filter, I deleted the AM filter
>  and use only the FM filter for the "low priority" modes wider
>  than 2.8 KHz.  However, it continues to frustrate me that
>  Elecraft have *STILL* not allowed us to use the 13 KHz filter
>  for AM/ESSB transmit (officially).
>
>  In any case, given the measured performance of the INRAD/Elecraft
>  "250 Hz" filter (about 350 to 375 Hz), I can certainly see the
>  utility of something like:
>
>  FL1   13 kHz (FM/AM/ESSB)
>  FL2   2.7 or 2.8 kHz (SSB and casual CW/DATA tuning)
>  FL3   1.8 or 1.5 KHz (Narrow SSB and wide data modes)
>  FL4   700 Hz (casual/normal CW/DATA)
>  FL5   350 Hz (Narrow CW/RTTY in heavy QRM)
>
>  While the "350 Hz" filter would lack the absolute selectivity of
>  the Elecraft 200 Hz 5-pole filter, it would be nearly optimum
>  for 45.45 baud RTTY and still provide a useful "narrow CW" option.
>
>  73,
>
>      ... Joe, W4TV
>
>  On 9/21/2010 6:07 PM, Wayne Burdick wrote:
>  > 700 Hz is a useful CW/DATA filter bandwidth, certainly. I'm not
>  > surprised that some K3 owners are interested in this.
>  >
>  > Personally, I prefer much narrow CW/DATA bandwidths, and I use all
>  > modes. The lineup I use (and generally recommend) is:
>  >
>  > FL1   13 kHz (FM)
>  > FL2   6 kHz (AM/ESSB)
>  > FL3   2.7 or 2.8 kHz (SSB and casual CW/DATA tuning)
>  > FL4   400 or 500 Hz (normal CW/DATA)
>  > FL5   200 Hz (CW/DATA in heavy QRM)
>  >
>  > 73,
>  > Wayne
>  > N6KR
>  >
>  >
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-- 
Gary
VK4FD - Motorhome Mobile
http://www.qsl.net/vk4fd/
K3 #679
For everything else there's Mastercard!!!