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Re: [IRCA] EWE Up in Carlisle UK! (off topic)
- Subject: Re: [IRCA] EWE Up in Carlisle UK! (off topic)
- From: BARRY DAVIES <barry.davies25@xxxxxxxxxxxxxxx>
- Date: Mon, 11 Aug 2008 18:58:00 +0100 (BST)
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Cheers Patrick
I had a standard (UK) 4.7k Ohm pot in to start with. The thought was a 10k pot would show up the null better. Both new items and checked against a meter. I will switch the 4.7k back in. The null as such seems to be around the 2,000 Ohm mark.
A local guy also mentioned good grounding. I will go to 3 copper rods at each end.
I have looked at the wiring. Seems OK.
I was wondering how you can test the coax to balun connection. The centre pin and outer braiding are connected by the wire around the ferrite ring. I cannot think of a "shorting test" between the centre pin and case of the antenna 50 Ohm radio input plug?
Thanks for the tips so far
Barry
Patrick Martin <mwdxer@xxxxxxxxx> wrote:
I am still wondering about a loose connection or a defective pot,
matching transformer, etc. Even with a poor ground, and it doesn't sound
like you have one, the signal during the day should still have a stable
null. If the ground was not good, the null would just be not as deep. I
also don't care for using a 10K ohm pot, way too touchy. It may be the
issue too. Moving the control on a 5K ohm pot is touchy enough, a 10K,
it would be hard to get it adjusted corectly. To compare, I just went
out and touched up the pot (2.5K ohm) pot on 800 khz, the NW EWE with
the null to the SE. On the SW EWE, I get S9 on KPDQ-800 khz-1 KW-75
miles away (Portland OR). Using the NW EWE, and adjusting the null off
the back, I can get the null down to S Zero, no signal at all from KPDQ.
With a weak SAH from Penticton BC (300 miles to the NE. One coper pipe
should work ok, but I like more than that as a confort zone, if the
ground dries out in the Summer. The first thing I would do is to change
that pot to at least 5K, 2-3K would be better, but 5K should work, but
touchy.
73,
Patrick
Patrick Martin
KGED QSL Manager
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