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A few months ago, my friends at the Oxford and Harwell clubs both asked if I could come and give a talk to them. It’s something that I enjoy doing – it’s always good to meet people and if in some small way that I can encourage them to try something new or take a deeper interest in the hobby, then I’m delighted. What could I talk about though?

I decided to base the talk around the VHF/UHF column that I write for Practical Wireless in which I aim to cover as many aspects of VHF/UHF as I can and perhaps encourage people to look at their VHF/UHF radios in a different way.

I presented the talk for the first time at the Oxford club on Tuesday evening and I think it went ok! If as a presenter you enjoy it, it’s generally a fair sign! It’s always interesting to hear different perspectives from people.

– A first reaction from one attendee, ‘VHF? Is there anyone on it these days?’. It was fun explaining that yes, there really is!

– Another interesting suggestion was that the introduction of CTCSS on VHF/UHF repeaters had led to a decline in activity. I explained that although to use many repeaters you need to send a CTCSS tone, you don’t have to have CTCSS Decode on. So, if another repeater comes up on your frequency, you can still hear it. That’s certainly how I set my rigs up, although it sounded like not all rigs allowed this. I’d be surprised if CTCSS’ introduction had singularly led to a decline, but I’ve been surprised before….

– A very interesting discussion and heartfelt plea from an attendee about the RSGB’s VHF/UHF awards and how poorly supported they are. Obtaining QSL cards, on 432MHz in particular, apparently, had proven very difficult. But the member in question said that details of the RSGB’s VHF/UHF awards had not featured prominently in Radcom for many moons – did the society still have a commitment to them?

An interesting and enjoyable evening – thank you, ODARS! And I’m looking forward to visiting Harwell in a couple of weeks – and I’ll try and tweak the talk a bit by then!

George visits the Twit.tv studios and interviews Randy Hall, K7AGE. Tommy visits the Huntsville Hamfest. Jim builds an Audio Isolation Interface. Peter shows us the DATV QSO Party.

Via an article on the Southgate ARC site, I noticed that the UK Six Metre Group had published a commentary on the new bandplan for 50MHz as agreed at the IARU Region 1 conference held in August 2011 in Sun City, South Africa.

The main new feature of the bandplan is that the majority of beacons will move from the lower portion of the band to the segment between 50.400 and 50.500, although synchronised beacons will share a segment from 50.000 to 50.030. Also, the new CW segment sees a ‘Future International Calling’ frequency at 50.050 and an Intercontinental Calling frequency at 50.090.

EME has a segment from 50.310 to 50.320 and MS from 50.320 to 50.380

A WSPR frequency is established at 50.401 plus or minus 500Hz with a beacon exclusive band from there to 50.500.

Digital Voice gets a mention in the top section of the band for the first time.

The new bandplan is set to take effect from 1st January 2012, although beacons have until the end of 2014 to move. See the bandplan here

Last month, Ernest, AA1IK, wrote about a frustration that we’ve all experienced, an operator on the other end who needlessly sends unnecessary information.  In the particular QSO Ernest described, the other op totally botched a QSO in bad QSB (fading) conditions by repeating his callsign numerous times but sending their call only once or twice.  The barely-uttered callsign was consumed by QSB on each return, propagation closed, game over.

Most radio amateurs understand the value of getting the most signal out and being able to pick signals out of the mud on receive, going to great lengths to improve antenna systems and buying great rigs with good receivers and linear amplifiers to get more signal.  However, it seems many don’t understand basic information transmission and the value of time, or perhaps better stated, the value of airtime.

I see this quite a bit during Field Day.  Operators in search-and-pounce mode will say or send the callsign of the station they’re calling, despite there being only one station on frequency calling CQ.  Stations calling CQ when getting a weak caller will spend forty seconds telling the station they didn’t get their full callsign and list the several possibilities they thought it was.

The practice is even more annoying in emcomm.  Ever hear a station take 120 seconds to tell a SkyWarn net control that it’s raining at their house but otherwise there’s nothing reportable happening?

The amount of information that can be conveyed is a function of the rate of communication (baud rate/wpm), the noise on the channel (signal-to-noise ratio), and the time available to communicate.  Talk faster or send CW at a faster rate and you can send more information in a given amount of time.  If the signal to noise ratio is low, you may need to send or talk slower (perhaps using more phonetics) and you’ll need more time to communicate the same amount of information.  Sending redundant information not needed for “error correction” or information already known by the receiver is a waste of communication channel time.  Those familiar with digital communications will recognize the parallels between digital protocols and algorithms and what I’m describing above.

Phone operators and really any radio amateurs who want to understand efficient radio communication should listen to their local 911 dispatch frequencies.  Airtime is very valuable, and wasting it can result in lost property and lives.  You’ll hear exchanges like this after a page goes out and a unit is responding:

Fire company unit: “County 901.”

County Control: “County.”

Fire company unit: “901 responding.”

County Control: “901 responding, 123 Main Street, dwelling fire.”

Fire company unit: “In route”

County Control: “Nineteen twenty-three”

In this exchange the unit informed county they were responding, they got the information on the call, and county confirmed the whole exchange with the time at the end.  Granted, public safety communications are usually on clear channels with little noise, but can you imagine some of the exchanges we hear on amateur radio in a public safety environment?

CW operators tend to be more efficient by default as the CW mode naturally encourages a level of terseness that’s not intuitive in phone operation.  But some CW operators in weak signal and contest situations have room for improvement, needing to avoid needless callsign repeating, “URs” and “QSLs”.

This lack of understanding by many in amateur radio of the value of airtime and how to use it efficiently is one of my ongoing pet peeves.  To some extent I can understand in this day and age why a radio amateur may not be well versed in complex electronic theory, but communicating efficiently is basic and it doesn’t take much to learn how to do it, people just need to apply some logic, listen, and learn.

Welcome to Handiham World!

Image:  Knight-Kit T-60 transmitter

When I got my new QST the other day, I was flipping through it and found myself on the quick stats page. One of the questions was pretty simple and easy. Do you use 6 meters? WOW! The answer floored me.

Maps Courtesy DX Sherlock

According to this stat, 84% don’t use 6 meters. Why? I know when I got on it, it was usually very quiet and no activity.  What could the reason be? Everyone says it’s a fun band. I don’t think it’s lack of equipment. Most new all mode HF/VHF/UHF radios for the past 5 or so years, have had 6 meters built into it. And antennas can’t be the issue, as anyone could build a simple dipole for 6 meters. Even a 6 meter beam is pretty inexpensive. I got one at a Hamfest 4 years ago for like $60.

When I was at my local club meeting just last week, one of the guys asked what I was using and suggested I try PSK31, as that was a demonstration we had just watched, on 10 meters. Easy to get a vertical antenna up and a quick mode to setup as well. I like the idea, but I also want to get on 6 meters. He said yeah 6 is good, but the problem is no one is usually on there. Which brings me back to my question. Why not?

Yeah, DX on 6 can be fun when it’s hopping, but why not local stuff? SSB or AM. There’s an FM repeater listed for the area, but I’ll be damned if I can hear it. I’m starting to think it doesn’t exists anymore. But if it’s a lack of people, keeping 6 meters quiet, aren’t we just feeding the whole catch 22 cycle? I’m thinking maybe I should get the 6 meter dipole up and do a local 6 meter net on SSB. But now I put the question to you. If you’re not on 6 meters, why not?

73.

Rich also writes a Tech blog and posts stories every Tuesday and Thursday on Q103, Albany’s #1 Rock Station website, as well as Amateur Radio stories every Monday thru Friday on AmiZed Studios and hosts a podcast called The Kim & Rich Show with his fiance’ Kim Dunne.