We Wish You Joy!

And perhaps a Ham toy in your stocking

We here at

Surrey Amateur Radio Communications

wish you a joyous holiday season and

a very happy and prosperous New Year!

An old favourite:

'Twas the night before Christmas,  

And all through two-meters,  

Not a signal was keying up  

Any repeaters.

The antennas reached up  

From the tower, quite high,  

To catch the weak signals  

That bounced from the sky.

The children, with Basic,  

Took their HT's to bed,  

And dreamed of the day  

They'd be on HF, instead

.

Mom put on her headphones,  

I plugged in the key,  

And we tuned 40 meters  

For that rare ZK3.

When the meter was pegged  

By a signal with power.  

It smoked a small diode,  

And, I swear, shook the tower.

Mom yanked off her phones,  

And with all she could muster  

Logged a spot of the signal  

On the DX PacketCluster,

While I ran to the window  

And peered up at the sky,  

To see what could generate  

RF that high.

It was way in the distance,  

But the moon made it gleam -  

A flying sleigh,  

With an eight element beam,

And a little old driver  

Who looked slightly mean,  

So I though for a moment  

That it might be Wayne Green.

But no, it was Santa,  

The Santa of Hams,  

On a mission this Christmas  

To clean up the bands.

He circled the tower,  

Then stopped in his track,  

And he slid down the coax  

Right into the shack.

While Mom and I hid  

Behind stacks of CQ, 

This Santa of hamming  

Knew just what to do.

He cleared off the shack desk  

Of paper and parts,  

And filled out my late  

QSLs, for a start.

He ran copper braid,  

Took a steel rod and pounded  

It into the earth  

Till the station was grounded.

He tightened loose fittings,  

Re-soldered connections,  

Cranked down modulation,  

Installed lightning protection.

He neutralized tubes  

In my linear amp...  

(Never worked right before –  

Now it works like a champ).

A new low-pass filter  

Cleaned up the TV.  

He corrected the settings  

In my TNC.

He repaired the computer  

That wouldn't compute,  

And he backed up the hard drive  

And got it to boot.

Then, he reached really deep  

In the bag that he brought,  

And he pulled out a big box.  

"A new rig?" I thought!

"A new Kenwood? An Icom?  

A Yaesu, for me?

An Elecraft, TEN-TEC

Or Flex, could it be!"  

(If he thought I'd been bad  

It might be QRP!)

Yes! The Ultimate station!  

I suddenly got nervous?  

Could it be all those weekends

I worked Public Service?

He hooked it all up  

And in record time, quickly  

Worked 100 countries,  

All down on 160.

I should have been happy.  

It was my call he sent.  

But the cards and the postage

Will cost a month's rent!

He made final adjustments,  

And left a card by the key: 

"To Gary, from Santa Claus. 

Seventy-Three."

Then he grabbed his HT, 

Looked me straight in the eye, 

Punched a code on the pad, 

And was gone - no good bye.

I ran back to the station, 

And the pile up was big. 

But a card from St. Nick  

Would be worth my new rig.

Oh, too late, for his final

Came over the air.  

It was copied all over. 

It was heard everywhere.

The Ham's Santa exclaimed

What an old ham expects: 

"Merry Christmas to all, 

And to all, good DX."

© 1996, 2016 Gary Pearce KN4AQ 

And here is a previous post from Christmas 2017:

https://ve7sar.blogspot.com/2017/12/a-hams-night-before-christmas.html

Back To Basics: Voltage Measurement

How is a voltmeter usually connected to a circuit under test?

Question B-005-013-001 - From The Canadian Basic Question Bank

A handy thing to know, particularly as basic digital multimeters (DMMs) are now very inexpensive, usually less than $10., and can be useful for many things around the home like checking the condition of batteries.

The two types of voltmeter you may encounter are digital and analog.  Analog meters are recognizable by their printed scale and a moving needle. 

Voltage is always measured in parallel with a device, current in series. If you recall Ohm’s Law in your (Canadian) Basic Qualification, you will remember series, parallel and series-parallel circuits. If not, check this link:  http://www.physicsclassroom.com/class/circuits/Lesson-4/Two-Types-of-Connections

On the meter, first set the knob to a voltage range greater than the expected voltage. If you don’t know what to expect, set it to the highest range.  DC Voltage range has a V- with a straight line next to it, AC generally a V~ with a wavy line. For example, 2V measures voltages up to 2 volts, and 20V measures voltages up to 20 volts. In our circuit the meter is hooked up in parallel to measure the voltage of the component under test.

The correct answer therefore: In parallel with the circuit.

~ John VE7TI

Earth At Night!

A Free NASA eBook 

Earth at Night, NASA’s free new 200-page eBook in three formats, is now available online showing our planet in darkness as captured from space by Earth-observing satellites and astronauts on the International Space Station over the past 25 years.

Aside from the fascinating photos, there are explanations of Earth's weather as well as the Aurora and other phenomena of interest to the Amateur Radio Community

https://www.nasa.gov/connect/ebooks/earthatnight_detail.html

A SARC Basic Course Retrospective

A Message From A Successful Teen Ham

Hello, readers. I’m Samantha, I’m sixteen years old, and this May I got my amateur radio basic license - with honours, too. Finally entering the world of amateur radio came with a lot of passion, learning, and a bit of studying, and having a gate wide open to another enormous world of learning is perhaps one of the things about having a license I’m most excited about. Though I’m proud about my achievement, I have to thank Surrey Amateur Radio Communications Basic radio course for my success.

Sammi and Member of Parliament Sukh Dhaliwal
at Field Day 2016

SARC sets up a course so amateurs-to-be can prepare for their license test. It went through all the topics we needed, through on-air etiquette and the long list of laws, among more interesting things like electric theory and propagation (man, those are fascinating topics). However, what I appreciated most in the course was the caring environment, where asking questions, talking with others, and even joking around a little is perfectly normal. 

I felt very welcome in the class – though being the only girl in the class was a little disappointing – and I especially want to thank John VE7TI, Stan VA7NF, and John VA7XB for all being incredibly knowledgeable, kind, and personable. It helps when a learning environment is friendly; I don’t think I could learn if it isn’t. In fact, it’s wonderful that amateur radio in general is so friendly to everyone.

Noah, age 13, a graduate of our Fall 2019 course,
at 27 students, our largest class ever.
His dad [right] who also graduated from this class,
and one of the instructors John VE7TI

See, the thing about the world of amateur radio is that it’s just so big. If you don’t like one aspect of it, there’s going to be another that piques your interest. Plus, it’s not just a hobby for one type of person or one type of community. Anyone, and yes, I mean anyone, can get a license. Doesn’t matter if you’re old or young, male, female, neither, or both; what matters is that amateur radio is interesting to you, even if it’s just digital radio or only using a phone mode. My hope is that other teens like me discover this community and, like me, fall in love with it and all it has to offer, because this world isn’t dying. As long as we’re around, we’ll make sure to let it thrive.

~ Samantha VA7HBE

Our next course starts February 25, 2020 at 6:30pm

For more information email: course@ve7sar.net

Our Field Day Success!

Another First For The SARC-SEPAR Team

We just got the results from 2019 ARRL Field Day, VE7SAR achieved top score in Canada (again) for 3A. Great work and congratulations to the SARC & SEPAR team members.

How did we accomplish this again?

Our planning this year followed the Incident Command System (ICS), a structured means of planning and staffing a large event. Our ICS approach to planning was described in detail in a previous post.

Electronic Magazines?

The Local Library Can Probably Meet Your Need

For some time I have had a electronic subscription to the magazine service called Next Issue. This cost me about $9.95 a month, but I’ve made a great discovery.

Would you like to receive the current and back issues of ‘CQ’ amateur radio magazine for free? Well you can, plus almost three-hundred other retail magazines covering a wide variety of subjects and interests. How? Well do you have a library card? If not, you can get one for free at your local library. Once you have it, in our city just go online to https://www.surreylibraries.ca/books-media#B (or your city library depending on your locality) and look for the link to the eLibrary. Once there, click on Zinio Digital Magazines.

Once there you'll see not only CQ magazine but Popular Mechanics, Popular Science, many computer and woodworking magazines and lots more.  A video tutorial is at https://vimeo.com/118833746.

Current Issues — New issues are released simultaneously with the print edition. Many are available before they arrive at your library and are ready for immediate download.

Back List — As your collection grows, so does the digital library for anytime checkout and reading.

Easy browsing and checkout — Browse your library's collection of titles one at a time, search for your favorite magazines by title or use the convenient category feature to find new magazines which meet your interests.

Manage your collection — Using the personal account you create, you will have the opportunity to checkout magazines and read them instantly on your computer or access the content on a portable media device.

I use an iPad for my reading and Zinio has a dedicated app. There is also one for Windows and Android devices and for most popular eBook readers. There is no limit to the number of magazines you can download nor is there a limit how long you keep them. No waiting list or reservations. When you're done with them just delete them from your device. If there is something I want to get I make a screen grab. There is a request form for new magazines to be added… perhaps if enough of us ask we can get some additional Amateur Radio publications.

I hadn't been to a library in months but, thanks to Norman Schmidt VE7IIT, whom I followed into the library after a recent breakfast, I made this marvelous discovery. I can now sit back in my easy chair and read more magazines than I could justify subscribing to. I even get an email when my favorite magazines publish a new issue.

~ John VE7TI

Make Your Own Single-layer Air-core Coil

Information and examples to make practical single-layer air-core coils.

Whenever you are working on an RF filter, choke, antenna or an oscillator design, most likely you will need a coil. Under some circumstances, the coil might not be available commercially or may be expensive. If this is the case, you have to make your own. This article will provide the information and examples to make practical single-layer air-core coils.

The well known Wheeler’s formula is used to calculate the approximate inductance of a single-layer air-core coil.  In 1925, Harold A. Wheeler published his formula as shown below. This is not a theoretical formula but an empirical one and is accurate to 3~4%.

Where:

     L: inductance (μH)

     d: diameter of coil (inch)     
     n: turns of winding                    
     l: length of coil (inch)

For best result by using this formula, the length of the coil (l) should be equal to or greater than 40% (0.4) of the coil diameter (d). If you study the formula carefully, you will find that the inductance is proportional to the square of the turns. That is, if you want to double the coil’s inductance, you don’t have to double the turns, you just add 40% more turns to the coil. For example, if you have a coil of 47μH and the winding has 100 turns, and you want to double the coil’s inductance to 94μH, you simply add another 40 turns to it, for a total of 140 turns.

Example 1: What is the inductance of a coil if the coil has 86 turns wound on a 1.25 inch diameter round form, and the coil’s length is 1.5 inches? In this case, d = 1.25,  l = 1.5 and n = 86.

Since the input data are only good to (at most) 3 significant figures, the result is only good to 3 figures so you would round the answer to 140µH.  To calculate the number of turns of a single-layer air-core coil for a given value of inductance, re-arrange the formula and it becomes:

Example 2: To build an AM radio, an inductance of 260μH is required. The form on which the coil is to be wound has a diameter of two inches and one inch is chosen to be the length of that coil. Then d = 2 inches, l = 1 inch and L = 260.

Since the coil is 1 inch long, the number of turns per inch is 70 / 1 = 70. Consulting the chart at the end of this article, we find that 28 AWG enameled wire can be used.

To make it easy for you to build your single-layer air-core coil, the author has written a script with PHP to do all the calculations for you. All you have to do is just plug in the desired inductance, the diameter of the coil form, the wire gauge and, if wanted, the operating frequency (for the Q or quality factor of the coil). Then you will be given the number of turns of the coil, the length of the coil and the length of wire needed. Since you know the length of the coil, you just wind the coil tightly to that length, which saves you from having to count the turns.  I hate to do the counting because it is tedious and frustrating when you lose count, believe me. You can fool around with the diameter of the coil form and/or the wire gauge to optimize your coil.

I’ve placed the script on our website.  You can try it out from the link below.

http://www.ve7sar.net/CoilCalculator/CoilCalculator-en.php

The above picture shows the final product of the example 2 in this article.

The coil is wound with 28 AWG enameled wire on a 2 inch diameter pill bottle. 

254μH is measured, which is 2.3% less than the target value 260μH. 

This result is more than adequate for most applications.

Have fun on winding and I hope this has been useful.

~ Hiu VE7YXG