Ham Bites

Information worth sharing.

From Peter VE1PS Aug. 11th, 2017

From Peter VE1PS Aug. 10th, 2017

Here is a response from the earlier posting Vehicle Radio Interference.


From Kevin VE1KEV Aug.10th, 2017

 From Rapid Lesson Sharing

Vehicle Radio Interference

We (Forest Radio Techs) have been getting reports of problems of radio reception in vehicles—hearing static/whining noise over the radio.
We have found one source for this problem: radio interference being caused by 12V USB/Cell cigarette chargers. To be able to reliably receive radio messages, we therefore recommend not using these chargers and to unplug them.
Cigarette lighter adapters that convert from 12V to USB 5V often use a DC Switching Supply to do the voltage/power conversion.
If possible, use the USB charger built into the vehicle. They have been designed to prevent radio interference.
Because the circuitry is exposed or just housed in plastic, Radio Frequency Interference (RFI), also called Electromagnetic Interference (EMI), can radiate easily. It can also conduct and radiate via the power leads that feed the unit. There will be harmonics based on the switching frequency. These can—and will—interfere with various radio receivers on various bands/frequencies.
The higher-priced Original Equipment Manufacturer (OEM) chargers have less interference. The models that offend the most are the cheapest versions.
If possible, use the USB charger built into the vehicle. They have been designed to prevent radio interference.

For More Information:


Safety Notice

Any electrical or electronic device can cause interference or blocking to your mobile and portable radio, and even nearby vehicles and radios. If you are having problems receiving—especially in areas where you know you had reliable radio coverage in the past—unplug any electrical or electronic device in your vehicle and test it again. If the reception improves, consider that device suspect.
These devices include but are not limited to: inverters, USB chargers, phone chargers, cell phones, laptops, and MP3/music players.
In particular, the bullet-shaped USB chargers widely available have been shown to produce enough interference to completely block radio reception.

Due to this radio interference, the Oregon Department of Forestry has issued an advisory to not use cheap USB converters in its vehicles. (See their “Safety Notice” on previous page.) It might be a good idea to get the word out that these chargers can cause radio problems.
Using these devices might mean missing important radio messages—posing potential safety issues.
 Do not use USB chargers when radio reception is Mission Critical.
 While all 12V converters can cause radio interference, the higher-priced devices are usually engineered to reduce radio noise.
 Also, using a handheld inside a truck with tinted windows does not work due to the tint having metal in it. The radio signal just bounces around in cab—not getting out. Therefore, to talk on the handheld: turn off truck, then get out and away from it.
 We also found radio interference coming from the new vehicles due to the ignition coils on top of the engine and all the electronics now installed inside, especially on the keyless ignition models.

From Don VE1CG May 12th, 2017

Two articles I just published on the RadiocomHistory.ca website that might be of interest to Hams:

Field Day - June 27,  1992  -  The Minister On The Air
by Joe MacPherson, VE1CH

by Donald Courcy, VE1CG

Donald Courcy
Webmaster  -  www.RadiocomHistory.ca

From John VE6EY Mar.18th, 2017

Earlier this year, I published a series of articles on my web site called the "Arduino Ham Radio Starter Kit". The purpose of this information is to encourage more hams and their clubs to engage with the local maker community as a gateway to amateur radio.

These articles explain Arduino basics in a ham radio context. They contain many suggestions about how amateurs can use Arduinos, as well as how a ham club can engage other makers in hobby activities.

Please take a moment to review the Arduino Ham Radio Starter Kit articles. If you find them to be useful, please consider passing these along to your members or contacts.

You can use these articles by linking them to your web site, Twitter feed, Facebook page or by e-mail.
The URL is:

Thanks for your consideration. If you have any questions or suggestions, please contact me.

73 John Fallows VE6EY Calgary, Alberta


From Hal VE1LV Dec.22nd:


The group is open to all license radio amateur radio operators in the world.
This group was created to permit amateur through out Canada to network and inform us what is happening in their radio life via the WIRES-X network.
The net takes place every Wednesday evening starting at 6 PM in the Pacific, 9 PM Eastern, 10 PM Atlantic time zones and all time zones in between.
We shall be using the CQ-Vancouver Room #11,320 which may be reach via DTMF 21,320.
The CQ-Vancouver room is operated by the East Richmond Digital Group, club call sign: VA7REF.
All repeaters and nodes are welcome to connect. Question be posted her in the group or privately to va7ref@shaw.ca
Check ins will be by time zones starting the with Newfoundland zone and all stations east of the Atlantic ocean and proceeding west towards the Pacific Ocean.
Ted Lee
If you want to join this group: https://www.yaesu.com/jp/en/wires-x/index.php

1) Read the "About" on the right (actually, everyone should)
2) Click on "Join Group"
3) Expect a profile visit from an admin due to all of the spam
4) If your public profile does not clearly show an interest in 
Amateur Radio, you should send a message to one of the admins to explain.
Most requests are handled in 12-24 hours, often sooner if your public profile shows an interest.
If your request is not approved, please review the above steps.
Thanks and 73
Founder, VE7LE, VE7LEE