Hi Bill (and group),
Yes, you are right about changing the subject line. I have changed it in
this response.
Many of us have limited space for our ham shack and antennas. This often
results in our transmitting antennas being fairly close to the shack.
Even with proper grounding of transceiver, amplifier, matching devices,
keyers and other devices in the shack, there can be strong RF fields in
the shack.
We have all come to expect that typical consumer electronics equipment
has been built to operate in the typical home environment, which does
not include a 100 watt to1500 watt transmitter within several hundred
feet, in order to save a few nickels per unit. So, we are not surprised
to have RF susceptibilty problems with that equipment.
I still expect that equipment which is designed to produce 100 watts (or
to be used as part of a system that produces 1500 watts) of RF power to
be built so that it will operate in the environment it creates, right
out of the box, without us having to add ferrites to our headphone cords.
DE N6KB
bill rowlett wrote:
How about changing the subject line. This has nothing to do with "SS last
weekend".
KC4ATU
From: Ken Brown <ken.d.brown@hawaiiantel.net>
Reply-To: ken.d.brown@hawaiiantel.net,Discussion of Ten-Tec Equipment
<tentec@contesting.com>
To: Ron Castro <ronc@sonic.net>,Discussion of Ten-Tec Equipment
<tentec@contesting.com>
Subject: Re: [TenTec] SS last weekend
Date: Tue, 07 Nov 2006 08:28:54 -1000
The ferrite is keeping RF picked up by to headphone cable from getting
into the electronics and causing the thump, right? So then is the Orion
not designed to work around strong EM fields, without having to add
attachments to your headphone cable?
I have had RF intrusion into various rigs, cause troubles. Every time it
was due to a poorly made cable connected to an input (usually
microphone) never to a headphone output jack. So I know that even the
best rigs may be susceptible to strong RF in the shack. On the headphone
jack though? From just the pickup on the headphone cable? Tell me it is
not true, and the guys with this problem are either doing something
really wrong, or have defective rigs. This is Ten-Tec premier rig, right?
DE N6KB
Ron Castro wrote:
The thumping in the headphones on 15 meters is not an uncommon problem.
Try
it on 10, and it will probably be more pronounced, and even more so if
you
run power. You need to wrap the end of your headphone cable around a
ferrite loop like the FT-240 43 or 77 mix. That fixed the problem for
me
and for a few others here on the list.
Ron Castro
Chief Technical Officer
Results Radio, LLC
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