AmateurRadio.com

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?

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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?

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

Since my original Fredbox 2m AM design, a number of derivatives have been designed and built around the world. This is what our hobby is all about. Although the original Fredbox worked well and its results surprised me, it was always ripe for further developments, which is healthy. My Sixbox was a 6m version and at some point, when fitter, I’d like to make a simple 10m AM version for local natters.

See https://sites.google.com/site/g3xbmqrp3/vuhf/fredbox for the original Fredbox. Click on the schematic to enlarge. Other derivative ideas are on my website www.g3xbm.co.uk.   By the way, it got its name from Fred G8BWI who was a disabled local in the Cambridge area back in the 1970s. Fred was a regular contact and he could talk for hours and hours and hours and hours zzzzzzzzzzz. RIP Fred.

G6ALB has reported some progress in his tests using 433MHz AM modules, although it looks like an external linear audio transistor stage may be necessary to get best AM (voice) sensitivity from the super-regen detector. On TX he is getting 10dBm from the TX module at 5V (more with higher supply voltages) although the mod seems to be a mix of AM and FM. Our first “DX” test will probably be from G6ALB to me using the voice modulated TX module. I’ll receive Andrew on my FT817ND initially. When the super-regen RX is sensitive with speech I’ll try to receive him with that. Super-regens should be sensitive on AM, but are usually poor NBFM detectors.  We are about 3km apart and both have V2000 verticals externally mounted. At 70cms these have gain.

Andrew has ordered 5  pairs of 433MHz AM modules (TX as well as RX) for not much more than £2 total from China. This makes each TX/RX pair very inexpensive. It amazes me that they can make these so inexpensively. I hope G6ALB succeeds in this venture. It would be good to be able to communicate with him using a really low cost 70cm transceiver. I expect Andrew will write up his results in an article for a UK magazine later.

It seems entirely possible that a complete 70cm AM transceiver can be made for just a few pounds based on these low cost 433MHz AM modules.

In many ways, 6m (50MHz) is an ideal band for experiments. Short RF leads are always good, but 6m is a forgiving band and you can get away with HF constructional techniques. It is 2MHz wide here in the UK and this means all speech modes can be fitted and used. The page below shows a number of links to 50MHz projects.

See http://www.pg1n.nl/articles.php?lng=en&pg=145 .

See also my Sixbox 6m AM transceiver .

This little top band AM transmitter and a companion receiver were first published in the GQRP club SPRAT magazine. This TX version was built by M0DAD. Where the noise floor allows, 160m AM is quite popular for local nets.  There is something nice about “rolling your own” builds and getting satisfying results without spending a fortune. For daytime local use 160m AM is a great mode and rigs are simple. I am still surprised that more is not made of AM on 10m at night for local nets here in the UK.

See http://www.delboyonline.co.uk/m0dad/construcion/poppet_top_band_am_transmitter.htm.