Martin, It would seem to me that some 'standard' QSO contacts need to be run (scheduled) and the S/N ratio measured and 'recorded', maybe on a daily or weekly basis, demonstrating a negative slope, t
Wow .. how close are those to your station? Do you have any attenuators you can place in line with your HT in AM mode (so as to 'get out' of any possible saturation in the AGC loop) and try DFing aga
How much of this is due to Ethernet activity alone, separate from the huge amounts of noise that the cheap switchmode power supplies emit? I have to keep my 3 yr old Linksys switch (not simply a 'hub
Is it 'the baby' or the bathwater? It it the switching power supply or the actual LAN 'switch' and 100-base-T RFI emission or EMI conduction? Practically, it doesn't matter, *unless* one wants to jus
Excellent post Ray. I thought I would relate my experience with older, copper-braid coaxial cable. Once upon a time while developing a set of Hi-Q notch filter elements for use as a duplexer on Six m
Jim's comments below. I don't see it quite that way; I'm sure others may not either. This opening seems quite dismissive of an actual, bona-fide observation I made without providing any suitable expl
Jeff, In the 'old days' if it repeated every 15,750 (B&W) or 15,734 (color) Hz it was a TV set - - this sounds more like a PC monitor as you described it, although the old TV sets didn't produce garb
28.634 ? Didn't someone intend to write 28.636 (or so) ? My experience while mobile on 10 Meters in urban areas while idly 'searching for anomolies' always indictes around 28.636 MHz but this is not
Update: Better intro, description of: The Surface Wave Transmission Line by Stewart G3YSX http://www.carc.org.uk/html/archive19.html Jim P / WB5WPA / _______________________________________________ R
I think this may (IOW, use the info below cautiously) have been done before, but, may I surmise that these researchers, locked away in academia and seeking 'research dollars' managed to mildly hornsw
Using fomulas from the theory of 'Permutations and Combinations' the following equation determines the number of unique groupings (irrespective of the order or different permutations such as 1, 2 and
Straight from the (GM) horse's mouth: - - - - - - - - GMNA Engineering Centers General Motors Corporation January 2002 Issue Radio Telephone / Mobile Radio - Installation Guidelines http://service.gm
I notice they are on "double secret probation" as well, having been required to appoint a compliance officer, having to 'stay clean' by the book/consent decree for the next three years as well as han
"Ferrite rod antennas are quite tricky to get working properly - you need the highest permeability rod possible, _but_ the loss must be low at your operational frequency. Most medium wave rods will w
Turns out one of these Sears Model 2278 4-band AM/SW/FM "portables" that I described is currently listed on eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=15051&item=5751745814 &rd=1 No
It seems to me this was warranted; reading the history or 'background' for this particular order a few months back now IIRC some portion of the 'radiating' antenna structure was mounted at observatio
Someone has to 'write that check' - and right now (former) management/licensee types (the station looks to have been sold already at some point) are looking around quoting each other saying "don't lo
"SDG&E and others wants BPL for reading your meters automatically without human intervention and to monitor their power systems, transformers etc" This could actually work; these kinds of comms aren'
Good summary of uses for an o-scope, Ford. Add to that list these two 'uncommon' (but valuable) applications: - - - - - - - Measure RF Impedances Using an O-Scope http://www.dallas.net/~jvpoll/tech/p