AmateurRadio.com

Courtesy: http://www.arrl.org/

I've now completed a set of tank coils for the new'29 MOPA project. These were wound with 3/16" copper tubing which has become very difficult to source. Luckily, after much searching, I was fortunate enough to find several rolls locally at a very attractive price. Although I do see it quite often on e-bay, sellers either refuse to ship to Canada or their shipping charges are far too high to make it worthwhile. The larger 1/4" rolls are still readily available, but for any given inductance, will take up a lot more room on the breadboard if space is an issue.

These coils cover the amplifier tank, the Hartley oscillator's tank, and the antenna coupling link. Respectively, the coils measure 4.9uH, 4.0uH and 1.9uH.

Winding these is always fun but the method used requires that the needed length be predetermined and cut from the roll beforehand. The first time I did this, when building my TNT transmitter, I learned the hard way to always add at least another foot to cover the additional length eaten-up by turn-spacing and for coil end flattening and mounting.


While visiting Vancouver for a few days I was able to find a couple of pieces needed for my non-line of sight (NLOS) lightwave experiments.

I purchased a nice 4.25" magnifier lens, with suitable focal length, as well as an inexpensive page-size fresnel magnifying lens. What is particularly pleasing is that the fresnel is a rigid lens, about 2 mm thick, unlike most page magnifiers that are thin and floppy. I have yet to test its blur circle or determine its focal length.

I plan to use one or the other of these lenses in a small, portable lightwave receiver module that I can carry to the other side of the island to listen for the main large transmitter, aimed slightly above the horizon, in beacon-mode. If the smaller fresnel does the job, it will be an inexpensive source for anyone else needing a simple lens for either transmitting or receiving.

If the deep-red light tests prove successful, I'll switch the system to IR light but at this stage I'm not sure how focusing and optimizing receivers and transmitters can be done with a light source that is essentially invisible? Perhaps using an IR source that is right on the edge of deep-red will still have enough visible light to allow finding the optimum focus more easily.



More information on NLOS experiments can be found in Yahoo's Optical DX Group as well is in G3XBM' s 481thz blogs.

As well, anyone in the Vancouver lower mainland (as far as the northern Sunshine Coast area) that might be considering lightwave ... I'd love to work you! Pretty well any high spot in this region is direct LOS for me.
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

Stories you’ll find in our February, 2015 issue:

Monitoring the Russian Navy (Part 1)
By Tony Roper
In previous articles, military monitoring specialist, Tony Roper, took us inside NATO war games (TSM July 2014) and showed us how to monitor the Russian Air Force (TSM October 2014). In the first of a series, Tony turns his attention to the Russian navy and shows you how you can listen in CW and, amazingly, even track their positions.

The Amateur Radio Parity Act is Down, But Certainly Not Out!
By Richard Fisher KI6SN
The Amateur Radio Parity Act of 2014, proposed last June by U.S. Representative Adam Kinzinger (R-Illinois), never got out of the House Energy and Commerce Subcommittee on Communications and Technology. To paraphrase American author-humorist Mark Twain, the death of H.R. 4969, “is an exaggeration.” Proposed to protect radio amateurs and other communications hobbyists from private communities’ unreasonable antenna restrictions, it is expected to be back in play in the newly minted 114th Congress. Think of the legislation as merely hibernating.

Listening for WWII POWs
By Rich Post KB8TAD
It wasn’t the New Year’s Eve he had anticipated. Twenty-two year old Second Lieutenant George Klare was navigator on a B-17G bomber based in England. As part of the 418th squadron, he was at the navigator’s table reviewing the flight path of the bomber in the direction of Hamburg and its synthetic oil refineries, which were so vital to the German war machine during World War II. He had no idea that this might indeed be the last time he would see London during the war.

W9GRS: Middle School Amateur Radio Station Update
By Troy Simpson W9KVR
Teaching junior high science can never be accused of being boring, at least here in rural Illinois. Coming off what I would call a “rebuilding year,” in my last article, the 2014-2015 school year has seemed to hit its stride and halfway through we can say it has been a very eventful year! The school station W9GRS has settled into its new home in Room 115 with the sounds of PSK31 tones and voices often filling the air during the last class period of the day.

D-STAR – its History and its Future
By Cory GB Sickles WA3UVV
In 1999, about 10 years after the genesis of P25, the Japan Amateur Radio League (JARL) began developing a new standard for digital voice and data operation. Predominately funded by the Japanese government, in a similar – but different – way we might find a project funded by a grant allocation, the JARL committee’s work was released in 2001 and the Digital Smart Technologies for Amateur Radio—D-STAR was created. But why has the second oldest and first digital voice methodology created specifically for amateur radio taken so long to take hold and what is its future?

The Spectrum Monitor is available in PDF format which can be read on any desktop, laptop, iPad®, Kindle® Fire, or other device capable of opening a PDF file. Annual subscription (12 issues, beginning with the January 2015 issue) is $24. Individual monthly issues are available for $3 each.

Ken Reitz, KS4ZR, is publisher and managing editor of The Spectrum Monitor. Contact him at [email protected].

See http://www.aliexpress.com/store/331885 .   This website has some very low cost rigs for sale. An example is a 40m Pixie at around $10 post free. You’d be hard pressed to buy the individual parts for less!

UPDATE 1430z:   I have just ordered a 40m Pixie kit from them.  Should be here in 2 to 3 weeks time. I hope I can manage to build it with my clumsy soldering currently.

UPDATE 2000z: G1KQH has found the same Pixie at an even better price:

Greetings Roger

 

I could of saved you a fiver out of your pension but you had to rush in:

http://www.ebay.co.uk/itm/DIY-KITS-PIXIE-HAM-RADIO-HF-40M-CW-QRP-TRANSCEIVER-7-023-7-026MHz-/121521131018?pt=LH_DefaultDomain_0&hash=item1c4b394e0a

 

73 Steve
http://www.g1kqh.talktalk.net/

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

This is what Ed Muns, W0YK, said in an interview the other day, and goes on with “because they see this as kind of old school stuff.“

A year ago the ARRL web site said: “Amateur Radio showing steady growth in the US“. AH0A’s website with statistics over the US ham population backs this up with the curve shown here. Even in my local club we are now seeing young people signing up for licence classes. 

How different perspectives! How has an old radio amateur like W0YK come to believe in the myth of declining numbers of hams?

Sverre Holm, LA3ZA, is a regular contributor to AmateurRadio.com and writes from Norway. Contact him at [email protected].

 

• BULLETIN: FCC "Paperless" Amateur Radio license policy to take effect in February
• Radio politics in Thailand has ham radio caught in the middle
• Two more world-circling pico balloons are launched from Australia
• The ARRL announces some DXCC and VHF contest rules changes
• Ham radio featured on New York City “Save A Life” television program
• And this just in: scientists launch sounding rockets during surprise auroras over the Arctic

    THIS WEEK'S NEWSCAST

    Script

    Audio 

YouKits Canada has announced the latest version of the TJ2B SSB handheld radio, that now also will provide cw mode after many requests from users of this radio.
The unit has also received some great reviews by the techs at ARRL test lab and have been published recently in QST.
Yimin strives to do his ultimate best with QC and trouble shooting as well as refunds and repairs. Not unusual for him to send a replacement radio before he has accepted the problem unit.
The HB line of radios has proven themselves over again in the field. many new projects are being developed by YouKits and we look forward to seeing these new items in the future.

 

http://www.youkits.com/#TJ2B_MK2_5_Band_SSB_Handheld_Transceiver

 

73 Fred Lesnick

VE3FAL

Fred Lesnick, VE3FAL, is a regular contributor to AmateurRadio.com and writes from Thunder Bay Ontario, Canada. Contact him at [email protected].

It's been a while since I really made an effort to use the ol' Vibroplex.  I gave the contacts a decent cleaning today and gave it a whirl in a QSO with Art K8CIT. I don't think I sounded terrible - and I hope Art didn't think so either. I could use some more practise, though, and I will continue to use it more often.

I haven't run this piece in a long time. It's from my old webpage on how to adjust a bug:

Using a bug is a real fun part of using Morse Code.  Adjusting one properly so that it works right for you and doesn't frustrate the heck out of you is easy; if you take your time and work methodically. Refer to the photo below for reference.


The first thing you do is to back off all the adjusting screws quite a bit.  Not all the way; but far enough out so that everything is nowhere near being set.  Once that's done you want to adjust the action of the pendulum.  Unscrew "A" - this is the pivot point for the pendulum.  Slowly tighten it. You'll know you have it adjusted correctly when the pendulum moves from side to side freely with no binding; but, at the same time, you can move the finger pieces up and down with your fingers and feel very little or no play.

The next thing you want to do is to adjust screw "B".  Allow the pendulum to hit the damper.  Screw in "B" to the point where you can either see or just perceive the pendulum has touched the damper.  Stop there and secure the screw with the knurled lock nut.  It is important not to move the pendulum too far away from the damper or else you will not be able to reliably stop your "dits".

The next thing you want to do is adjust the  left trunnion screw -  D.  This will control the amount of side to side travel of the pendulum.  For smooth code this gap should be very small.  I take a piece of ordinary printer paper, fold it in half to double it and adjust the spacing so that the paper will just slip between the point of the screw and the pendulum.  This results in a very small amount of side to side travel.  The end result is a nice and clean transition between "dits" and "dahs".  I do the same thing for the amount of spacing for the "dah" contact at C.  I turn that trunnion screw in so that the paper slips in the gap easily with no binding, then I lock the set screw in place to keep the setting.

The next thing you want to do is adjust the "dits" making part of your bug.  This is done by adjusting "E".  When "E" is adjusted correctly, you should be able to swing the pendulum to make "dits"; and get 10 to 15 "dits" before the pendulum dampens out and comes to a rest.

"F" controls the tension of the "dit" action.  I find it best to tension the spring about half way.  Hopefully, if you follow this guide and play around a little bit and experiment, you will find the "sweet spot" that will allow you to send really glassy smooth Morse Code.

Sending with a Bug is just as much fun as sending with a keyer and paddles.  However, sending with a Bug allows you to add a little personality.  Listening to CW sent with a keyer sounds sterile compared to that sent with a Bug.

If you need to slow down the speed of your Bug to a point that's even slower than what you can get with the weight(s) positioned all the way to the end of the pendulum, then clip a clothes pin or a few alligator clips to the end of the pendulum.  This will slow down a Bug to an effective speed as low as 13 words per minute or so.

In my opinion, you know that your bug is adjusted properly when you can send characters like X, Y, Q, C, F and L with little effort, and they sound good - or at least recognizable in my case!

Here's a great video that shows you how to do it, also:


72 de Larry W2LJ
QRP - When you care to send the very least!
Larry Makoski, W2LJ, is a regular contributor to AmateurRadio.com and writes from New Jersey, USA. Contact him at [email protected].