AmateurRadio.com

I received an email this morning from ML&S, that they are moving their Chertsey store to bigger premises in the New Year:

Pop down to the link below for more details:


http://www.hamradio.co.uk/hogroast.php



I wish them well with the move and for the future..
Steve, G1KQH, is a regular contributor to AmateurRadio.com and writes from England. Contact him at g1kqh@arrl.net.

A fire has destroyed the manufacturing facility of Hardened Power Systems, a research, design and fabrication facility in middle Tennessee. Popular among radio amateurs for their portable power hardware the DHAP, and other unique equipment. Current orders destroyed, but owner Bill Harrison says they will be back.

Filed under: Ham Radio Tagged: business, dhap

Jeff Davis, KE9V, is a regular contributor to AmateurRadio.com and writes from Indiana, USA.

In this fortnight’s episode of Linux in the Ham Shack, Pete (VE2XPL), returns to the land of the living. Your intrepid hosts discuss explosions in the sky, a “holiday” for ham radio operators, Linux vulnerabilities, caipirinhas, and ask the vital question: What is Allstar Link and does anyone use it? All that and more in this action-packed installment of LHS. Thanks for watching, and as always…

73 de The LHS Guys

Russ Woodman, K5TUX, co-hosts the Linux in the Ham Shack podcast which is available for download in both MP3 and OGG audio format. Contact him at russ@bluecows.com.

Jay has been working on new versions of his little WSPR beacons. All being well I should receive a 10m 500mW out version in the next few weeks.

Jay is writing the manual(s) and has asked me for my feedback, which I shall, of course, provide. The new version is a single board (again) but transmits continuously, randomising the TX frequency on each TX burst to minimise interference to/from others. It needs several minutes to thermally stabilise but uses the uP to generate everything needed such as the WSPR tones, so no PC is needed. The transmission is started manually on the start of an even minute with a push button. The PA can be separately enabled.

This should be fun. I’ll give more information when it arrives and I get a chance to try it on the air.

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.

Some years ago I went to a BBQ where someone had a wi-fi controlled quadcopter remotely controlled from an iPad. It was very impressive with its on-board cameras for navigation and filming what was happening down below.

I see AE5X has a video showing the inspection of his antennas (from above) using one of these. My antenna farm is trivial by comparison and can be pretty well examined at ground level.

See http://www.ae5x.com/blog/various/youtube-de-ae5x/

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.

 

 

Outcome of my damp MFJ 1788

The weather has been up and down up this way from snow and minus 2C then up to plus 14C it's the top end of the temp scale that I enjoy but that will soon come to an end as winter is on it's way! While on the subject of the warmer weather also comes showers and damp weather, for some reason this has an affect on my MFJ 1788 isoloop. In past I have found my antenna to be SWR sensitive to the damp and or humid weather. I had posted on some of the mag loop user groups to see if  others had the same issue. I was not able to get lots of responses but the consensus was that weather really had no effect on others loop! I ended up taking my loop apart and just checking out the insides and all looked good.

The work of the internal tuner

Once the damp and or humid weather changed all was well with the loop. The effect on the antenna is the SWR will not go below 2.7:1 on any given band but any other time the SWR would be either flat or close to it. I posted about this very problem this past summer on my blog and it really was not a humid summer so the problem did not arise that often. Now that it has happened again my own conclusion is the damp weather has an effect on the dielectric characteristics of the air that separates the capacitor plates in the antenna. This by no means is a scientific conclusion but as for simple old me it's the conclusion I am leaning toward. I do have an internal antenna tuner in the Elecraft K3 and my Elecraft KX3,

The SWR of the antenna

this allows me to lower the SWR so the rig does not see the high SWR.
Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at ve9kk@hotmail.com.