Posts Tagged ‘Electronics’

Radio Frequency Interference From 12V-to-USB Adapters

Many small electronic devices have switching regulators in them that can generate a bunch of Radio Frequency Interference (RFI). This is not my first encounter with RFI-spewing devices. See this article about a automotive 12V-to-USB adapter giving me trouble: This Interference Seems To Follow Me Everywhere

I recently bought a couple of adapters that are physically larger than the one I wrote about. I was thinking that a larger size might allow for a little more filtering and a design that does not radiate. I was half right: one of them works pretty well, the other is an RFI Bad Boy.

Take a look at this short video where I check them out.

 

 

 

This is an Amazon link to the adapter that works pretty well.
Enercell® 2-Port USB CLA Car Charger

 

73, Bob K0NR

The post Radio Frequency Interference From 12V-to-USB Adapters appeared first on The KØNR Radio Site.

Add an On The Air LED to Kenwood MC-60 Desk Mic

In this video I show a few things to test before adding an “On The Air” LED indicator to a Kenwood TS-50 ham radio transmitter. I tested for the best brightness of the LED and lowest current using a ganged restore test box I built. The LED was then mounted in my Kenwood MC-60 desktop microphone.

Fluke micro probes

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HF Ham Radio Kenwood TS-50S Panel Button Repair

The buttons in my Kenwood TS-50S ham radio started falling out when the foam inside started getting old. The foam was the only thing holding the buttons in so I used jewelry repair rings from  Michaels Store to clamp around the base of the buttons inside the bezel face plate which then holds the buttons in nicely yet lets them have full travel and good tactical feel.

ISO-TIP 7700 Soldering Iron Review

Model 7700

Model 7700 soldering iron

I recently had the opportunity to try out a new ISO-TIP 7700 soldering iron. This is a rechargeable soldering iron without a lot of extra features but it is plenty capable for small soldering tasks. Here’s a few specs from the ISO-TIP web site:

MODEL #7700
– Fully recharges in 3.5 to 4.0 hours
– Partially charged battery to full capacity in one to two hours
– Up to 125 soldering joints per charge during continuous use
– Withstands high-rate charging without damage
I’ve been on the lookout for a simple construction project for our local radio club and had acquired a Blinkey Kit from rainbowkits.com. This is a simple two-LED flasher circuit using the venerable 555 timer. I decided it was also a great little project to try out the 7700 soldering iron. Assembly was very simple, requiring 24 solder joints. The iron did a find job of heating up those joints. It takes about 2 to 3 seconds for the tip to heat up, plenty fast for my needs.
IMG_0414soldering

Soldering iron in action

Here’s a short video of the circuit blinking away, proving that I can solder together a simple circuit: Video of circuit blinking Yes, the circuit did work the first time.

The soldering iron performed well, no complaints at all. With only 24 joints to solder, I did not stress the capacity of the iron (which is rated at 125 joints). This is a relatively light duty iron, so I wondered how well it would do against a physically large soldering task. Soldering a PL-259 coaxial connector is a common task for amateur radio work, one that takes a lot of heat. I was surprised to find that the 7700 was able to heat up the center pin of the connector quite nicely. I was not surprised that it struggled with heating the body of the connector. I think that is asking too much of this size soldering iron. The only nit I would pick is I’d really like a LED power/charging indicator. I am always nervous about whether a device is plugged in, getting power, really charging and a simple indicator would solve that. But that is a very minor issue and probably speaks more about my personal paranoia than the soldering iron.
This iron has quickly become my “Go To” tool for quick soldering jobs. I don’t do major kit assembly and other big soldering tasks. I just need a little soldering here and there and this baby is always in the charging stand ready to go. To order the soldering iron (and see other products), visit http://www.iso-tip.com/products-page/
Use discount code YT1510 to get 10% off store wide.
73, Bob K0NR
Disclosure: this soldering iron was provided to me by ISO-TIP at no charge.

The post ISO-TIP 7700 Soldering Iron Review appeared first on The KØNR Radio Site.

GQRP / Kanga receiver

I was sent a kit this week by Kanga UK, who supplied me a new regen receiver. The kit in question makes its debut at the GQRP convention at Rishworth UK this week. Its appearance is marked by the annual buildathon.

The buildathon is a great way for anyone who has an interest in electronics, radio or has indeed has no experience in construction, build a kit and walk away with a working radio. The step by step guide we supply with the kits allows easy installation of the components and instant gratification.

I wrote the instructions for this kit and whilst doing so, I managed to video the whole build. The video is sped up, but the build actually took about 2 hours, not rushing and includes the videoing & taking pictures.


GQRP / Kanga receiver

I was sent a kit this week by Kanga UK, who supplied me a new regen receiver. The kit in question makes its debut at the GQRP convention at Rishworth UK this week. Its appearance is marked by the annual buildathon.

The buildathon is a great way for anyone who has an interest in electronics, radio or has indeed has no experience in construction, build a kit and walk away with a working radio. The step by step guide we supply with the kits allows easy installation of the components and instant gratification.

I wrote the instructions for this kit and whilst doing so, I managed to video the whole build. The video is sped up, but the build actually took about 2 hours, not rushing and includes the videoing & taking pictures.


Surface mount soldering

If, like me, you have had an irrational fear of surface mount devices for some time, you will be glad to know its not as bad as you may think. I recently started working with SMD and while I suffer from shaky hands and have poor eyesight, its actually quite a methodical process and not as fiddly as you would think.

I created a 2 part video on SMD soldering using a hot air (reflow) station and using solder paste. In this video I created a QRP dummy load which is a great introduction into Surface Mount Components and at a great price of £5.95 available from Kanga Products



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