Wouldn't be the first time an MW station puts out a signal on a harmonic frequency. This happens all the time. If you tune around between 2 and 3 MHz, you will often find a handful of broadcast harmo
Unfortunately, there seem to be two. 1807 and 1838 are where I have seen most digital transmissions on 160m. -- All rights reversed. _______________________________________________ UR RST IS ... ...
Agreed. I believe it would be a polite thing for all the digital ops to happen around 1838, so as to not cause interference to the CW ops lower in the band. -- All rights reversed. __________________
I have actually heard a dxpedition put some particularly badly behaving ham on their own little blacklist, telling him off on the air and promising to never put him in their log because of bad behavi
Even worse is forgetting to clear split mode after working the DX. Then you end up spamming the frequency where the DX is listening, while trying to make your next QSO... I seem to do this every once
It looks like Part 15 has separate rules for emissions conducted back onto the power line (15.107) and emissions radiated into the environment (15.108). The "radiated emissions limit" section does no
The FCP, and also the double L antenna, work as well as the (poor) radial systems that many people can put up. It will not outperform a proper radial field with many dozens of quarter wave radials. A
I plan to do a similar thing on 80m, though probably with double L antennas (vertical dipoles with the ends running horizontally). An array of 3 or 4 of those looks like it can outperform a single ve
Things are looking good at WRC-12. Approval of an international amateur radio allocation around 470 kHz seems very likely: http://www.arrl.org/news/agenda-item-1-23-passes-committee-moves-to-plenary
Selling the physical awards, which many people want to have, appears to be one of the main things paying for the cost of running LOTW. As long as LOTW will have bills to pay, I imagine the ARRL will
A beverage works because the difference in velocity factors (between air and wire? between wire and ground?) bends the wavefront. Does a slinky, with a lower velocity factor, bend the wavefront more?
I have not (yet?) noticed any RF issues with the NON-dimmable Ecosmart CFL bulbs. Thanks for the warning on the LED ones... -- All rights reversed. _______________________________________________ UR
This really depends on how good the ground system below the vertical is. If you have an exceptionally good ground system, you can get those 5 degree takeoff angles. More typical for ham radio setups
The problem is that radiation does not just have an amplitude, it also has a phase angle. At certain ground resistances, the ground wave and the low angle sky wave will cancel each other out, which m
Does that have any consequences when planning phasing lines for a receive 4-square that is to be used on eg. 137 kHz? Are there types of coax that are more predictable on LF? Would the quad-shield RG
What do you think about 120' vs 190' ? Ever do any tests like that? I wonder if it would be an idea to try these ideas on 40m. That way it could be tested with much antennas small enough multiple peo
I have been looking on the Internet, and one possible solution is Array Solutions Model AS-RXFEP, RF Front End Protector. The advertising claims to protect in the feedback situation as well as in a
§97.307(f) Âno longer reflect the state of the art of digital telecommunications technology, and that the proposed rule change would Âencourage both flexibility and efficiency in the employment of
For the guy who has the land and wants to own 20-10M in one or two directions for his daily chats, a rhombic will cost a lot less than a rotating tower with stacked yagis for each band. Also conside
A K9AY has a cardioid pattern, with a single null in the back. The SALA is cross fire fed, with a single lobe in one direction, and greatly attenuated reception in all other directions. -- All rights