A friend from work brough in an old QST one day (I think it was from the 1930's). There was an article in that QST discussing an earthquake in Southern California and how there were some jerks jammin
I think we should change the topic of this thread to something less controversial like religion or politics :):) Steve, K7LXC please stop this thread, or I will be forced to post my recently composed
I think the ARRL RFI handbook has test data on a bunch of different LPFs and HPFs in the Appendix. It is interesting to note the wide variation in performance. Mike W4EF......................... ____
Yes. Amplifiers generally don't produce non-harmonic spurious. They produce harmonic distortion and intermodulation distortion. Both harmonic distortion and intermodulation distortion products have c
I tried modeling that with EZNEC and it didn't seem to help much, so I ended up keeping the lengths the same. I also modeled the two wire bow-tie dipole with the open ends and with the ends closed (a
The "precipitation static" I observed around here (Los Angeles area) last winter on 160 meters (and also 40 meters) sounded almost like line noise from a generator running at varying speed (it had a
Jim, The percipitation noise that I have heard has always been broadband RF impulses (e.g. pitch doesn't change with VFO frequency). Mike, W4EF..................................... __________________
I think perhaps both mechanisms (coronal discharge due to electric field gradient and particle induced charging) can occur in antenna systems depending on the environmental circumstances. Back in the
There is considerable material (with references) on this subject in Dave Leeson's book "Physical Design of Yagi Antennas". Chapter 8 deals with element taper equivalent cylinderical diameter calculat
Steve, I've seen this on the TH7 at the local club station. The antenna system was doing this last year. I used it last weekend at it was okay. I never did any tests to try to determine whether the p
Anybody know of a good source for Unistrut products (1 5/8" slotted channel) in the Los Angeles area. I need some for a tubing rack (for storing antennas) as well as a tower project. Mc Master Carr h
Thanks to all of those people who replied to my inquiry regarding sources for Unistrut around Los Angeles (KG0KP, W6RMK, AK6I, N2NFG, W8AEF, and Kevin N.) Your suggestions were very helpful. 73 de Mi
Just a quick follow-up to my earlier posting. I went to Home Despot this morning to see what there Unistrut selection looked like. They had 10ft lengths of Thomas and Betts "SuperStrut" 1 5/8" 12 gua
I think those are for 14 MHz and up. On 160 - 30 meters, I think they are using single verticals. I wonder which way the beach they are using is facing? Mike, W4EF....................................
As I recall, there are also rules in the UK (or at least there were 10 years ago) about shields on CATV drops being isolated between the customer premises end and the rest of the plant. Presumeably t
Or could it be that they didn't have much choice where they set up their gear? Part of the deal to get permission to operate on Kure required that the team help the resident naturalist with maintenan
Barry, Have you thought at all about how you are going to feed the long wire? Very long end-fed wires get very directive off the ends. We had a 600 footer at Ohio State (up ~100 ft). It ran east-west
These guys had 40ft artificial Christmas trees for around $10K (the 40ft appear to be sold out): http://www.treeclassics.com/product.asp?ProductFamilyID=GS Pretty expensive, but probably cheap compar
I was trying to picture that myself :) Mike, W4EF.................... _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather St
With the winter solstice in December just before Christmas usually comes excellent low-band conditions. I would go for a four-square of those 40 footer artificial Christmas trees base loaded for 80 m