[CCF] Leveistä signaaleista

[Jukka Klemola]

cq-contest reflektorilla on kirjoittelua leveistä signaaleista

Iso oivallus on että lähettimen mukana tulee myös vastuu toisten
harrastamisen mahdollisuuksista.
Toisin sanoen - jos sinun lähettimesi leviää, se estää muita harrastamasta.
Sinulla on vastuu myös toisten harrastamisen mahdollisuudesta.

Jim K9YC kirjoitti selkeän päätöksen kirjeelleen:
" When I was growing up, we were taught that with rights we also had
responsibilities. In ham radio, we are licensed for high power and can
build big stations. With that comes the responsibility to transmit a
clean signal that burns no more bandwidth than required. "


Jimin koko kirje reflektorilta tässä alla.

Reflektorilla on kirjoittelua radioiden puhtauteen liittyvistä
ominaisuuksista.
Jotkut radiot vain leviävät enemmän kuin toiset.

Vastuu toiminnasta on ihmisillä jotka tekevät radioiden ostopäätöksiä.

Olen tuonut jo muutama vuosi sitten muunmuassa RA lehdessä esille Jimin
TXNoise.pdf artikkelin: http://audiosystemsgroup.com/TXNoise.pdf

Nyttemmin myös Bob Sherwood (http://www.sherweng.com/table.html) on ottanut
kantaa asioihin toteamalla että vastaanottimen hyvyys on vain osa
transceiverin toimintaa.


73,
Jukka OH6LI


---------- Forwarded message ---------
Lähettäjä: Jim Brown <k9yc at audiosystemsgroup.com>
Date: pe 5. kesäk. 2020 klo 21.52
Subject: Re: [CQ-Contest] Key Clicks
To: <cq-contest at contesting.com>


On 6/4/2020 9:05 PM, Igor Sokolov wrote:
> It must be conveyed to participants in contests that 6 ms is the minimum.

The slides for this talk by K6XX and me to NCCC includes a series of
waterfalls and spectra from a neighbor's ICOM rig as the setting is
varied from 2-10 msec.

http://k9yc.com/K6XXAmpTalk.pdf

On 6/4/2020 7:32 PM, Joe wrote:
 > What do Key clicks look like in these new rigs waterfalls?
 >
 > Maybe take screen shots?

I posted links yesterday.

http://k9yc.com/P3_Spectrum_Measurements.pdf

On 6/5/2020 7:12 AM, Kimo Chun wrote:
 > I'm fairly sure all FT1000mp's (original) manufactured up to middle
to late
 > 2004 have this problem (per Inrad).

The defect in Yaesu radios persisted through at least three model upgrades.

We were reminded of this, recently,
 > when one of our spare radios at the M/M was reported to be doing this. We
 > had failed to ensure all the radios had been modified years ago.

Neighbor K6XX encountered this when he bought a used MP and used it in a
contest. We had a conversation the next day, and he modified it. Months
earlier, soon after I had moved in 3-4 miles down the road from him, he
called me about clicks. In a few minutes, we tracked it down to a noise
cancelling unit, in which the carrier detection circuit was causing the
clicks.

On 6/5/2020 8:22 AM, robert wa1fcn wrote:
 > Other than sending radio out for a modification, does anyone know menu
 > settings for a FT 1000mp Mark 5
 >
 >              that can help or at least lesson  key clicks ?

No, there are no menu settings in those radios that can fix their
clicks. The hardware mod from Inrad or using W8JI's advice is required.

On 6/5/2020 5:51 AM, S57AD wrote:
 > Occasionally I warned some guys the have bad clicks. In most cases they
 > retort "I use first class radio, the fault is on your receiver." So I
garee
 > radios (especially first class ones9 should be addresses for having bad
 > clicks.

Point them to these links, which clearly show the problem.

http://k9yc.com/TXNoise.pdf
http://k9yc.com/K6XXAmpTalk.pdf
http://k9yc.com/P3_Spectrum_Measurements.pdf

I had the same problem with a different neighbor, a lawyer with no
technical background, who went legalistic on me. He had an Icom 7600
that was burning 10-15 kHz of whatever band he was using. He said the
rig passed FCC type-acceptance limits, and he was going to use it. (He
failed to read the next paragraph that said a signal could occupy no
more than the minimum bandwidth required for the communications type
being employed.) 5 years later he bought a K3S, and maybe also a Flex
6000-series rig, so his signal is now clean.

When the K3 came out in 2008, my neighbor W6DRX (about 700m distant) and
I both bought them to replace existing rigs because, as engineers, we
knew it was the only way that we could co-exist. I was running a pair of
(fixed) MPs at the time.

When I was growing up, we were taught that with rights we also had
responsibilities. In ham radio, we are licensed for high power and can
build big stations. With that comes the responsibility to transmit a
clean signal that burns no more bandwidth than required.

73, Jim K9YC
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