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My Latest Contraption, a QRP portable, all in one, seat & table, etc!

Bungee Tie Down, Close Up

I added a bungee cord on each end to prevent damage from the radio accidentally falling off the table.

Bunggee Does Not Touch The ButtonsThe cord does not touch the buttons.

Bungee Tie Down, Rear View

View from the back

My Latest Contraption, A QRP Radio, Portable Table and Chair 11-12-2014 1-22-32 PM 2448x3264

All in one, QRP seat, table,  umbrella and antenna anchor! The bottle on the table is bug spray! LOL

 

Kx3 Radio In Operation on the Table  11-12-2014 1-25-015

The table is a cutting board attached to the existing shelf.

The cutting board is bigger than the existing shelf, so I have more room for logging and a sturdy place to attach the antenna!

A bungee cord takes up the slack from the antenna in the wind. In a real world test, I found that one radial is all I need.

I tried an experiment, adding two, then four radials. There was no detectable change in signal level by ear on or the S meter.

One radial did the trick, and 4 radials didn’t improve the signal at all.

 

Me, In The Drivers Seat of My Portable Table & Chair Set Up 11-12-2014 1-35-43 PM 2168x1870

Note the guy ropes. This is to hold the chair in place. The golf umbrella is stuffed into  a piece of PVC pipe.

The PVC pipe is tied to the chair with cable ties.

Wind and the antenna pulling on the table would easily turn the chair over.

Satisfaction, with My Latest Contraption

Satisfaction! I can’t wait for the next ham radio outing with my QRP buddies.

How do they ever make a profit?

On the internet you can buy a dual-band handheld with antenna, battery, chargers(2), earpiece and belt clip for just £25.29. At this price I find it unbelievable they can make a profit. I think it is even cheaper if you buy a batch of 3.
 .
See http://www.banggood.com/LBaofeng-UV-5RA-Yellow-Dual-Band-Transceiver-Radio-Wakie-Talkie-p-947385.html  .

Shipping is just 29p. shipped to the UK by registered air parcel. It is available in a variety of case colours.

Using the W5OLF 500mW 10m WSPR beacon today

W5OLF WSPR beacon – complete – no PC needed

This WSPR-AXE really is a very impressive little rig, in my case for 10m WSPR.  Because of my current disabled state –  I find all electronics building just about impossible – Jay very kindly sold me a built unit to evaluate. Results in just a few hours of operating have been truly impressive. No PC is needed as long as the push button is pressed at the start of an even minute. Jay says it stays stable for weeks thereafter. I ran mine for 3.5 hours and got masses of decodes. After lunch it has been getting LOTS of spots from the USA. I am sure it will reach Australia soon.

The unit needs about 15 minutes to frequency stabilise and after that it always on, but it randomises the slots within the WSPR transmit window. This means it is unlikely to be “clobbered” by more powerful stations or cause others co-channel issues.

Best DX report (so far) today is FR1GZ (9724km).

10m WSPR – unique spots with the W5OLF beacon today, arranged by distance

If you want to buy one Jay W5OLF may be contacted on [email protected]t .

Hardened Power Systems Launches Crowdfunded Campaign to Rebuild

Bill Harrison, KK4JPT, has announced that Hardened Power Systems has launched an online campaign to fund the rebuilding of their business.

On Halloween, the company suffered a devastating fire resulting in the loss of their manufacturing facility.

Hardened Power Systems manufactures several popular ham radio products including the D-HAP and JuiceBox.

Here is where you come in, we need your financial commitment to begin the process of rebuilding this business. We are determined to remain faithful to our commitment of quality, durability, and cost effectiveness. The process of rebuilding will take time and we are prepared for the journey ahead, but to expedite this process we need your support. In return we will make a promise to compensate you for your gift with limited editions of some of our gear to commemorate this event.



W5OLF WSPR kit

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.

Inspecting antennas – by radio controlled quadcopter!

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/

Weather VS MFJ 1788 loop

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.

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