An Invitation To Assist...

2018 Pacific Forest Rally

We have received an invitation to have our members assist at an event. Read on…

My name is Geoff Hill; I am the volunteer coordinator for the 2018 Pacific Forest Rally, the 5th round of the 2018 Canadian National Rally Championship, which is being held on September 28-30, 2018. I would like to tell you more about this event, in the hopes that you or members of your club would be interested in volunteering as Radio Operators.
Pacific Forest Rally is a sanctioned performance driving competition taking place on temporarily closed forestry roads surrounding Merritt, BC. 

The event needs amateur radio operators such as yourselves, who are crucial to the safety and success of the weekend. This is also an amazing opportunity to put your amateur radio skills & equipment in action, and see real cars, on real roads, driving real fast!

What you would be doing:

As radio operators, you would be stationed at the start and finish line of each closed road, or at blocker positions along the route itself, monitoring and controlling access at intersecting roads or high-risk areas. The primary roles of the radio operator are to help the event organizers track the progress of rally cars on the roads, to keep any civilians from entering the road during competition, and to pass along relevant information in the event of a crash or safety incident.

There will be a training and Q&A session for operators just before the event.

What we provide:

To reduce costs to our volunteers as much as possible, we try to provide free shared accommodation at the Best Western, Ramada, or Quality Inn hotels in Merritt. We also provide bag lunches during the event, and free admittance to the awards banquet and post event celebrations. When the budget allows, we do our best to provide shirts, toques, or other free swag to volunteers to show our appreciation.

What you need to bring:

Because this event takes place in late autumn conditions on dirt/gravel/muddy/snowy forest service roads, we advise proper winter or all-weather tires in good condition, a reliable vehicle with reasonable ground clearance, and reliable radio equipment that can run for multiple hours at a time on the power provided by your vehicle. It is good practice to also bring food, fluids, and anything else you might need for an extended stay outside. The event does run after dark, so headlamps and flashlights will come in handy. Finally, warm winter clothing and wilderness common sense are also important to bring along! 

Where to sign up:

The Volunteer registration page for the event can be found here:
https://www.rallywest.com/signup/volunteer/PacificForestRally 

For more information:

Introduction to Rally Volunteering (description of the radio operator role in particular can be found on page 6 of this document)
Pacific Forest Rally Website
Canadian Association of Rallysport (CARS) website
Canadian Association of Rallysport Youtube channel with lots of videos showing rally cars in action.

I humbly request your assistance to inform members of your amateur radio club of this opportunity. If you have any questions, don’t hesitate to get in touch with me directly.

Geoff Hill
geoff@rallybc.com 
Volunteer Coordinator, Pacific Forest Rally 2018
Director at Large, RPM
Secretary, WCRA

Reflecting On The Summer Forest Fires

Over 500 Forest Fires

The Largest, Longest, Most Expensive Fire Season Ever

In the Greater Vancouver area, we have not had to endure any evacuations due to the fires that are plaguing much of our province and even into the USA. The smoke in our area gives us some impression of how bad the forest fires must be.  The Province of BC declared a state of emergency August 16th 2018 and there were about 560 fires burning in our province alone. For a short stretch, the news reported, that we had the worse air quality in the world.




There has not, to my knowledge, been a need to activate any Emergency Communications Teams due to the fires. That doesn’t mean that there isn’t the real possibility that there could be activations for forest fires. 

The Colorado forest fires in July 2012 saw ARES teams in Colorado County called out to communicate at a number of fires. In Arizona this year, the ARES group in Coconino County was called to action because of poor cellular communications to the front line of the forest fires. In 2016, in Tennessee, ARES bridged the communications gap for the Red Cross during the wildfires there. In California in 2015, during the wildfires there, ARES volunteers in Amador,  Yolo and Sacramento Counties were activated to assist the Red Cross. 

In 2016, New Mexico Volunteers were also activated during wildfires in that state.
It’s pretty unlikely that we’ll be called to action for a wildfire in the Greater Vancouver area. It is a real possibility for other areas of the province however. When a disaster happens close to home, it makes people think about disasters, so it’s a good time to think about your preparedness status. 

If you are reading this and don’t know how to prepare (hopefully you aren’t a Surrey Emergency Program Amateur Radio (SEPAR) member because all our members should be ready), there are lots of places online that can give you ideas of what you need to do.  Preparedness is a little different for everyone, depending on your personal needs. A good place to start is:

https://www2.gov.bc.ca/gov/content/safety/emergency-preparedness-response-recovery/preparedbc

Get Prepared!

SEPAR Annual Competition

As of last April, we started a competition that active SEPAR members can participate in. The most active member will win an MD390 DMR Radio package. You can checkout pictures of the radio and see the rules on http://va7.ca/radio (an interim website).
If you are not now a member, we’d love to have you on-board. Contact me at the  link above.

~ Roger VA7VH
   SEPAR Coordinator

About Microphones

A Communicator Reprise: September 2012

A Primer On Mics For Ham Radio

All Hams use them as a basic piece of operating equipment but most never give it a second thought—the microphone.

A microphone colloquially called a mic or mike is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal.


Both Thomas Alva Edison and Emile Berliner filed patent applications for the carbon microphone, in March and June 1877 respectively. After a long legal battle, Edison emerged the victor, and the Berliner patent was ruled invalid by both American and British courts. 

There are basically two kinds of microphone technology, dynamic and condenser.
Dynamic mics are actually backwards speakers and generate a small amount of electricity when the diaphragm of the mic moves back and forth under the pressure of the sound waves hitting it.

Condenser mics are powered or biased by electricity and so are more sensitive; they use a more lightweight diaphragm and are better at picking up nuances of sound. "Large diaphragm" condenser mics are more sensitive and more expensive than "small diaphragm" types. 

Pickup Patterns isn't what you get when you drive your truck in circles in the snow, but refers to the relative sensitivity of a microphone to sounds coming from the side. A pickup pattern can be… 

Omnidirectional picks up equally well in all directions
Unidirectional picks up mostly from one direction
Cardioid picks up in a heart-shaped pattern (hey, you think your dad was kidding when he said studying Latin would come in handy sometime?) 

Exotica ribbon mics, tube mics, and most other technologies are probably way out of your budget anyway… except for the PZM (Pressure Zone Microphone), which is patented by Crown and was used by Radio Shack for many years. The current Radio Shack mic is not considered to be much good, but if you can find one of the older ones, you can modify it for serious use.

Plugs everyone is used to teeny little 1/8" plugs found on consumer mics, 1/4" plugs found on guitar cables or the little square plastic ones on your transceiver mic  that look like an over-sized telephone plug. Forget all that. Professional mics have XLR plugs and balanced cables, which have the following characteristics.

The plugs lock in and don't rip out easily when someone trips over something.
the cables have three conductors, which not only make them thicker and more resistant to rough handling, but also means that they're less likely to pick up buzz, hum, etc.

Balanced vs Unbalanced

An unbalanced audio path has two conductors. One carries the audio signal and the other is the shield/ground. There is nothing at all wrong with an unbalanced signal but at times can be susceptible to picking up interference from radio frequencies or electro magnetic fields causing noise and buzz and picking up the occasional unwanted radio station! In fact, a lot of gear is unbalanced on the inside even though it has a balanced input and output. Including some high end consoles. 

A balanced signal has three conductors. It relies on a sum and difference principal. 
Sum and difference is the combining (summing) of two signals that are out of phase from each other. Whatever doesn't cancel out is what you're left with (difference).
When two identical signals of identical amplitude (volume) are combined and one is 180 degrees out of phase from the other you have complete cancellation of that audio. However, if one of those signals is a different amplitude, you don't get complete cancellation. And it's this principal that makes a balanced audio path work.
The output from a balanced piece of gear will have the audio signal on XLR pin 2 (hot). That same signal will be present on pin 3 (cold) however that signal is at the opposite phase from the signal on pin 2. The shield/ground will be on pin 1. 

When the signal reaches a balanced input, the signal on pins 2 and 3 are combined with either pin 2 or pin 3 (usually pin 3) out of phase. If that cable happens to pick up interference along the way, it will be on all pins, in phase together and at the same amplitude. When it gets to the input, pins 2 and 3 are combined out of phase and any signal exhibiting the same amplitude (the noise) will cancel out completely. Since the audio is at different amplitudes, it doesn't cancel out and you're left with the difference: clean audio!

Heil, Shure and Sennheiser are manufacturers of premium microphones. They generally come with XLR plugs but Heil in particular provides a vast array of adapters to interface their mics to almost any make of transceiver. Bob Heil [K9EID] is a ham himself and has devoted a great deal of time to perfecting mics that sound good despite the poor conditions often encountered with HF Amateur Radio.

All amateur radio transmitters (except the new Yaesu FTdx9000) unfortunately use an unbalanced microphone input. It's sad, but true. In connecting a balanced microphone, equalizer, or audio device that uses balanced signals, care has to be taken in how the balanced signal is UNBALANCED in order to feed that unbalanced input.

So you can't generally just plug a mic with an XLR cable into a radio jack, even with a properly wired adapter. That's because the mic will almost certainly have a lower impedance than the input of what you're plugging it into, and that means that unless you correct things with a matching device, it will sound like junk. 

One option for HF home use is to invest about $45 in a small mixer such as a Behringer Xenyx 802. This unit comes with 1/4” and XLR jacks but will adapt to almost any mic.  It will even provide ‘phantom’ power to condenser mics when the radio does not provide it. The output of the mixer goes to your radio and you have full control over what your mic sounds like, particularly of you want to adjust the equalizer to punch through HF interference. I purchased mine at a music store here in Surrey and the difference is noticeable.

VHF and UHF Transceivers generally come with low cost and sometimes low quality microphones. The mic on your handy talkie or a typical handheld mic is a condenser microphone. Manufacturers use different plugs and pin configurations  though most amateur supply houses stock adaptors. 

If you are participating in an event where you may be on the radio as Net Control for an extended period, a headset and boom or desk mic and a foot pedal are a must. Not only does it leave your hands free but the audio quality and lessened background noise will provide much better communication. My Heil desk mic and Heil headset will interface with all my transceivers (and even my computer) with adapters.

Hints on using your mic effectively

If using a handi talkie, invest in a hand-held microphone. It will he healthier not having that antenna radiating right beside your brain and also more comfortable in use.
Talk across the front of the handheld mic rather than directly into it. This will provide a less harsh and therefore clearer sound.

Push the ‘Talk’ button and pause a second. This will permit the repeater and any interface equipment with an opportunity to fully power up and avoids a portion of your transmission being cut off.

In closing, be careful about switching mics from one transceiver to another. Not only are different makes using mics with different pin connections but some manufacturers use different mics with the same plug on different models within their own brand. Transceivers generally carry a small voltage on one of the mic pins to power the condenser element. If this voltage is shorted because a pin is connected to another point inside the mic, say to ground, damage to the transceiver may result.

There is an excellent site with pin-outs for different mics at https://www.scribd.com/doc/54320681/Microphone-Pinouts

RFI: A Practical Example Of The Effect

A Communicator Reprise: January 2013

At the suggestion of Jim Smith VE7FO, I recently joined an RFI reflector at http://lists.contesting.com/.  Why?  Because I hoped to find some answers to a frustrating Radio Frequency Interference (RFI) problem that I was experiencing.  

I had installed in my bathroom an electrically heated floor and thermostat c/w built-in ground fault interrupter (GFI).  However, whenever I transmitted, even briefly, on 15m or 10m the GFI would trip and the power would go off.  The first time this happened, the thermostat failed to work again even after resetting the GFI.  First call was to the supplier (NuHeat) of the “Solo” thermostat.  

Their customer support team knew nothing about RFI and I had to explain that it was likely a problem with the thermostat and not a problem with my radio transmissions.  Without argument, they replaced the thermostat with a new one (#2).  Not wanting to take further chances with ruining another thermostat, I decided to install some RF protective devices, as I assumed that the 220 v house wiring was picking up RF and passing it through to the thermostat. 

While RF interference is not a new problem, it is most commonly experienced with telephones and audio devices.  However, nowadays the large variety of RF susceptible electronic devices in our houses has greatly increased the likelihood of problems.  The number of devices emitting RF has also increased accordingly.  Plasma TVs, computer monitors, electric fences, touch turn-on lamps, halogen lights, and wall-wart switching power supplies are just some of the items that are reputed to send out wide-spectrum RF, but there are many others.  What to do in this case? 

First, I applied the standard remedy: I clamped split ferrite cores around the power cable near the thermostat.  That appeared to have no effect, however this time the thermostat could be reset and made functional, which was progress of a sort.  Then I ordered an RFI kit from Palomar and when it arrived I added ferrite beads to the individual power leads.  No improvement.  Next I connected .01 uF disc ceramic capacitors between the hot leads and ground.  Also NuHeat had provided me with a “snubber” – a capacitor with a resistor in series – which I connected across the power leads.   However, the problem persisted.  Finally after many emails and telephone back and forth, NuHeat put me in touch with Honeywell, the manufacturer of the thermostat.  

Honeywell responded very quickly first asking me some questions about my power level, frequencies, SWR etc that might suggest a transmitter problem.  After they were satisfied with the answers, Honeywell couriered another thermostat (#3) to me for trial.  No cigar.  When I reported this failure, they promptly sent me yet another thermostat (#4) called “Harmony”.  This is a more expensive device of (apparently) different design.  It worked!  

One by one, I removed the RF chokes and capacitors until they were all gone.  After several days of testing at different frequencies, there has been no effect on the thermostat/GFI, so I mounted it permanently and thanked Honeywell for their efficient service. 

Lesson: if you have an RFI issue, try the standard remedies but when they fail to solve the problem, get the manufacturer on board with device replacement in mind, as with modern radios it is typically not the radio transmissions that are at fault.  This approach may not work with some of the off-shore manufacturers, so bear this in mind when purchasing electronic devices – they may not care about their reputation and customer service the way Honeywell does. 

ARRL publishes several good RFI guides as well as the Radio Amateurs Handbook and more information can be found on the Internet.  For unusual problems that defy the conventional solutions, the RFI reflector website mentioned above is another excellent source of expert advice.

~ John VA7XB

   Now enjoying toasty toes in his remodeled bathroom.

SARC Contest Contender: September-October 2018

The Fall Contest Season

John VA7XB has taken on the job of Contest Manager and is proposing an active schedule for the next year now that SARC has two contest grade radios available for club use at the OTC.

For that purpose John would like to know who would like to be notified about upcoming contests.  If you have an interest in contesting, please contact John at va7xb@rac.ca with your preferred mode(s) and he will put you on the contact list. The objective for this fiscal year will be for SARC to compete in at least one contest a month so that members may acquire comfort with operating our new radios, accurately recording exchange information and using logging software. 

If your main interest is in emergency communication, these contests provide invaluable experience in operating under sometimes chaotic conditions including multi-station pileups, QRM (man-made interference), QRN (natural interference), lids (bad operators), over-the-pole flutter, static crashes and fading. 

If there is sufficient interest, we may even try some of the more exotic digital modes.

We cannot do them all, of course, but listed here are a few of the available contests for the months of September and October.

These and other contests are described at: http://www.contestcalendar.com//index.html

Surrey Basic Amateur Radio Course

Register Now... We Start Tuesday, September 11

The Surrey Amateur Radio Club generally offers two Basic licensing courses per year. Last year we graduated 27 members who attended our classes. These new 'Hams' came from all walks of life, some with technical backgrounds, most without. Many were interested in emergency preparedness and staying in touch if the BIG one hits.

We have set the start for the next class as Tuesday, September 11th at 6:30pm. We use the excellent classroom facilities courtesy of the Surrey Fire Service at their training facility 14901 64th Avenue, Surrey, BC.

Have a look at what Amateur Radio can offer:

An exciting modern hobby

A useful emergency communications skill

Have a look at our Basic Course brochure and poster

The September 2018 Communicator

We're Back! Here is the latest Communicator 

After our Summer recess we have over 50 pages of Amateur Radio News from the South West corner of Canada and elsewhere. You will find Amateur Radio related articles, profiles, news, tips and how-to's. You can download it as a .PDF file directly from 
goo.gl/8Kekuo

http://goo.gl/8Kekuo

As always, thank you to our contributors, and your feedback is always welcome.  My deadline for the October edition is September 14th. If you have news or events from your Vancouver area club or photos, stories, projects or other items of interest from elsewhere, please email them to the communicator@ve7sar.net

Keep visiting this site for regular updates and news.

~ 73,
  John VE7TI
  Communicator Editor