On Thu, 27 Apr 2006 11:53:58 +0200, "John Plimmer"
wrote:

Many of you are unaware that transmitters emit splatter.
A bad transmitter on the HF shortwave spectrum can emit 12 kilohertz of
splatter, that is 6 kilohertz of splatter either side of the centre
frequency. Since the shortwave band has a channel separation of only 5
kilohertz, that means that such a transmitter will obliterate and interfere
with signals either side of it on the 5 Khz separation.

A better bet than tuner's and matching units for optimising signal strength
is the simple 9:1 or 4:1 magnetic matching transformer. The 9:1 is suitable
for the lower reaches of the spectrum and the 4:1 if you do more listening
above 10 Mhz. I am sure RHF will rush to give you lots of leads on these
very effective devices that do not require endless knob twiddling.

If the transmitter is exceeding its alotted bandwidth I don't see how
a better impedance match at the receiver will do anything but make the
offensive material come in better.

This is just a real-world artifact of analog broadcasting. In the USA
we must put up with it on MW from Mexican stations that are way too
HiFi.

You could always buy the offending station one of these:

http://www.orban.com/products/radio/hf/9200/

A B-52 dropping a bunker-buster on the station would work better. The FCC is no help either. If you are not fabulously wealthy, they could care less.

All life all holiness come from you O Lord
http://pwp.surfglobal.net/mjmiller/index.htm





"David" wrote in message ...
On Thu, 27 Apr 2006 11:53:58 +0200, "John Plimmer"
wrote:

Many of you are unaware that transmitters emit splatter.
A bad transmitter on the HF shortwave spectrum can emit 12 kilohertz of
splatter, that is 6 kilohertz of splatter either side of the centre
frequency. Since the shortwave band has a channel separation of only 5
kilohertz, that means that such a transmitter will obliterate and interfere
with signals either side of it on the 5 Khz separation.

A better bet than tuner's and matching units for optimising signal strength
is the simple 9:1 or 4:1 magnetic matching transformer. The 9:1 is suitable
for the lower reaches of the spectrum and the 4:1 if you do more listening
above 10 Mhz. I am sure RHF will rush to give you lots of leads on these
very effective devices that do not require endless knob twiddling.

If the transmitter is exceeding its alotted bandwidth I don't see how
a better impedance match at the receiver will do anything but make the
offensive material come in better.

This is just a real-world artifact of analog broadcasting. In the USA
we must put up with it on MW from Mexican stations that are way too
HiFi.

You could always buy the offending station one of these:

http://www.orban.com/products/radio/hf/9200/