Russian prefix system effective since January 21, 2010 Classes and Prefixes 1st Class: R0AA – R9ZZ (except HQ suffix); RA0AA – RZ9ZZ (except RB0-RB9, RE0-RE9, RH-RH9, RI0-RI9, RP0-RP9, RR0-RR9 and RS0-RS9 prefixes); UA0AA – UI9ZZ; RA0A – RZ9Z (except RB0-RB9, RE0-RE9, RH0-RH9, RI0-RI9, RP0-RP9, RR0-RR9 and RS0-RS9 prefixes); UA0A – […]
Daily Archives: May 13, 2012
9 posts
by Barry Boothe, W9UCW, QST December 1974 Mobile operators and those who reside on property of city-lot size should findthe author’s treatment of physically shortened 160-meter vertical antennas of considerable interest. Construction details are given here for making his Minooka Special from readily available inexpensive materials. Performance is reported […]
Comments on the ‘No Code Proposed for for All U.S. Classes’ Read it (click here) and weep. (K5**) What’s to weep about? I’m sure ARRL will be thrilled by this, since this is what they’ve wanted all along. They’ve been pushing for reduced standards for as long as I can […]
Hipersil, what’s behind? by Will Matney I was asked about a transformer using nothing but a Hipersil transformer. I offered an EI type, M6 material transformer of the same specs, but it wouldn’t do. Well folks, this gave way to me writing this for all on what exactly is […]
The 4 rule The reactance of the windings should be at least four times the impedance the winding is designed to look into. where Zi … input impedance Zw … winding impedance thus where Lw … winding inductance Zi … input impedance f … design frequency To find the number […]
Another nice receiving antenna...
This description is taken from the Pete's W2PM posting into Topband reflector.
This antenna is very simple - it's a mini diamond Flag - with a 660 ohm terminating resistor and a 16:1 transformer. It is the exact size of the so-called magnetic loops, - 5 ft per side, 20 ft total wire, and about 7.1 ft wingspan. It has classic Flag cardiodal pattern and, of course, pretty low output (-50 dB from what I recall). F/B is about 30 dB. I use it with a single preamp with good results. This antenna is quite easily rotatable as you can see (altho the standard 15 X 30 ft Flags have been made rotatable too as most of you know).
This has several advantages over the "mag" loop (for those on small lots) - it's broadband 1.8 MHz past 30mhz; cardioid pattern with very nice null to rear, decent low angle take off (abt 32 deg) AND is simple - make it in minutes. I used 2 - 330 ohm resistors a binocular 16:1 transformer. I "potted" the resistors and xfrmr in epoxy.
I've since cleaned mine up - routing the RG-174 coax from the transformer to the center of the crosses, then connect it to a RG-58 run vertically down the mast.Thanx loads to Earl K6SE for the design.73 Pete, W2PM
The first look recalls the K9AY diamond receiving loop, just in another (rectangular) shape. The antenna fires in the direction toward the matching transformer (opposite to a Beverage and the same as the K9AY Loop). The first installation at VE3CSK has the bottom wire 18" above ground which is moist clay loam.
by Louis Varney, CEng, MIEE, AIL, G5RV* * (taken from RADIO COMMUNICATIONS, JULY 1984) THE G5RV ANTENNA, with its special feeder arrangement, is a multiband centre-fed antenna capable of very efficient operation on all hf bands from 3.5 to 28 MHz, specifically designed with dimensions which allow it to be […]
Geoff Cottrell, G3XGC, describes his coaxial receiving loop in the March issue of Practical Wireless [1] (download here). This article is widely available over the internet, which is a good point. The less pleasing fact is that this article contains a 'bug' - the primary of the transformer T1 should not be connected to C1 but to the other end of the loop (ie. to the ground).