Hi all, A change to the first part of the ZM2E LF DX night, we will be beaconing ZZZZ... from 0600 to 0850z tonight 23 September, with timing to start a Z on the hour and at 10 minute timing for each
Hi all readers, This coming weekend ZM2E will operate from Quartz Hill, looking for DX QSOs. Arrangements are still being finalised as to possible participating stations, from USA westwards to Europe
Reception conditions were fairly quiet at Quartz Hill last night. We captured a good "W" on UA4WPF's frequency in the 15 minutes slot beginning 1600utc. There were also what appeared to be good signa
This is the text of a message I sent earlier, but has not appeared on the reflector, maybe because of attached file size. 73, Bob Hi all readers, Thanks to all who tried to receive ZM2E. It seems tha
Hi all, The attached table has summary information of stations that ZM2E will look out for. There are also stateside signals we will look out for. 73, Bob ZL2CA Attachment: ZM2E september 07.rtf Desc
Hi all, Query on QRN versus QRM. LF natural noise levels (QRN) are typically well above the front end noise in good receiving gear, and there is not much that can be done to improve matters further.
Comments are made after the earlier material from Steve and Rik: Hello Steve & LF gang, I had a look at the picture on your web-page and it reminded me of an (unsuccesfull) attempt to improve my LF a
Hi all, The information from Petr is very interesting, and below I discuss aperture and noise figure considerations: Hi LowFers. Too lazy to make quality narrow input filter I tried another thing. I
Hi Geri, Dave and all LF'ers. I am following with great interest the debate on our relative signals. G3YXM / G3XTZ ) As Dave said, my vertical is 20 meters high, but the two 10 meter loading wires fr
Comments on bandwidth and noise blankers: Mike is probably right. Unfortunately most of us see the transmit bandwidth of the antenna as being that for which the SWR is acceptable. With my present loo
<It has been noted in ZL that noise blankers do not work so well on <narrowband loop receiving antennas I have never found a noise blanker on any amateur receiver which has the slightest effect on th
I have done very many antenna experiments over the past 2-3 years to get a better signal at 73 and 136kHz from a small garden. snip snip I have found by using a telescopic mast at the outer part of m
I have also a question regarding the topic of radiation resistance of short verticals (with and without tophats) : All the formulas I saw so far alway assumed the vertical over a perfect ground. This
Go for the biggest loop with the highest Q that you can get 73. Roger G2AJV Agreed. The fundamental parameter is APERTURE. The number of turns is really a sort of impedance matching arrangement, espe
totally It is my understanding that "low radiation" is mostly concerning the CRT magnetic flux (necessary for CRT spot deflection). Low radiation means that as far as is practicable the sweep flux i
Hi all, Taking up the thread of the ERP discussion, and consideration of verticals or a dipole: At the rather long wavelengths of interest, amateur antennas at LF are usually very short in electrical
assuming the above hypothesis is valid, why not a horizontal loop, which could be much smaller than a dipole ?Andre' N4ICK I was not meaning to restrict the idea to a dipole, but rather to stimulate
Any idea how high (above ground) the antenna of ZL1WB is ? I might have acces to a 800m (0.36 lambda) abandoned telephone line, but the wire will be only about 6 meter above ground. Will this work or
The comments on ground systems are very interesting and I have some contributions: For a single vertical LF transmitting antenna, the most natural path for a radiating current is perfectly radial to
Hi all, I missed one other piece of information, which is now added: Kevin ZL4MD uses link coupling from his LF transmitter, which isolates the RF output, so there is no path for the mains (safety) e
