Thanks Don! I really appreciate the info. I picked up a CATV signal meter (Wavetek SAM IIID) which is great for hunting power line noise but very bulky to carry around. I would really like to have an
Thanks Don. That sounds very good. That is what I would expect and would like to find in a wide range receiver. I already have a modified MFJ-856 so I have the aircraft band covered. There are times
Thanks Dale. I went through all of those settings with my DJ-X11T but did not notice any significant improvement. Maybe my unit was defective in some way. I found it to be a reasonably competent rece
I have a modified MFJ-856 which I found near useless out of the box. After modification it is better. It has a very deep, sharp null at 90 degrees (off the side) which is more useful for confirming a
I found several sources that say it is discontinued, so I guess HRO has a bunch of them they want gone. The receiver seems to get mixed reviews (See eHam). 73, Paul N1BUG Maybe HRO is clearing-out th
I have been wondering about this for a while. AC line filters for HF are everywhere. Most are characterized up to 30 MHz. Are there some that work well at 147 MHz? I got tired of digging through data
I don't think so, because when that one box is powered off, the junk on its power cord and wiring in the building goes away. here is one source of power filters for vhf/uhf, these are for dc use but
Thanks Gary. I have a supply of Corcom and similar filters and they work great at HF. They seem to do little to nothing at VHF. Thanks to the link you provided I did find they have one model that is
On 05/20/2015 07:51 PM, Jim Brown wrote: Here's a series of CorCom filters that looks promising. http://www.te.com/usa-en/product-1-6609037-1.html#pdp-docs-features Click on the "see all documentatio
I'm digging through boxes and the bones of past projects to see if I have a 6EF1. I have used a number of that type over the years. The ones I had were very effective at HF and 6M but did little to n
Tony, My experience has been that long CAT5/6 cables do radiate and cause RFI. Mostly it is carriers on numerous HF and VHF frequencies. Any broadband noise has generally turned out to be a "bad" pow
Roger, Thanks for your comments. I got behind - Spring crunch season! What make and model PS? I don't know. It is at the repeater site and I have not been able to get up there to check on it yet. Thi
On 08/30/2015 01:36 PM, David C. Hallam wrote: My problem is not that interference in the normal way we think of interference. I do not hear my signal in the speakers nor does it seem to affect the s
Congratulations Jim and thanks for all you do! 73, Paul N1BUG I know Jim has been very active on this mailing list, with sharing lots of good info. If you guys have not seen this, from ARRL Contest U
I am sorry to ask this, but the probably obvious answer isn't obvious to me. Assume I want to make a current balun consisting of two (or more) chokes in series. Assume each choke will consist of a si
Hi Jim, Thanks for responding. Comments below. First, let's call a spade a spade -- it's not a "balun" or even a "current balun," it's a common mode choke. What we CALL it helps us understand what it
I found something similar at a repeater site a while back. We suddenly developed a horrible noise on the local 2 meter repeater. To make a long story short, what I finally discovered was that a wall
I suspect this is a stupid question but I am not finding a concise answer or I am not recognizing it when I see it. How important is it to fit the I.D. of snap-on RFI suppression ferrites to the size
I have re-read both RFI-Ham.pdf and KillingReceiveNoise.pdf twice each over the last couple of days. Great work which I refer to frequently, but neither really answers my question. Suppose I am tryin
Thank you Dave! This seems to confirm my gut feeling. I suspect if the ferrite were almost solid with just a small hole through the center (just larger than the wire) Z (or more importantly equivalen