I didn’t really like the yellowish backlight on my VHF/UHF SWR Meter so I opened it up and grabbed a blue LED to replace it with. I added a small toggle switch as well so I can power the backlight off without having to unplug the power from the back.
It had 12volts already coming in from a power supply so I had to find the right resistor to use on the LED. It is a basic formula:
To calculate the resistor needed for a simple LED circuit, simply take the voltage drop away from the source voltage then use Ohm’s Law.
- Es is the source voltage, measured in volts (V)
- Eled is the voltage drop across the LED, measured in volts (V)
- Iled is the current through the LED, measured in Amperes (Amps/A)
- R is the resistance, measured in Ohms (Ω)
so.. R=(Es – Eled) / iled
If you don’t want to bother with that you can go HERE
I needed a 560 Ohm resistor to make my LED work on 12volts
I just like the blue backlight!
Wish I had a little smaller switch to use but it gets the job done.
I am hoping to find a decent deal on an Antenna Tuner there and other goodies! Be nice to win that raffle as well but it will all be fun going to my first Hamfest.
A couple days before I took my test I had also received my first radio. To start off I wanted to get on the 2Meter band being as I could talk phone right away with a Technician’s license and I would be more likely to make contacts on local repeaters than trying on 10meter sideband right off. I was skeptical at spending too much right away as I didn’t know enough about what was to be had out there without a further education.
So after reading quite a bit on forums and reviews I decide to give the very affordable BaoFeng UV5R+ a shot.
It is a tidy little Handheld with most the features you need or would want. Programmable via cable or keypad, scans frequencies or memory channels and even has a flashlight and a decent Fm broadcast radio.
I found the best price on Amazon I picked up an programming cable, Mic and a TRAM model 1185 mobile dual band antenna for my Jeep. This is a lot of radio for 40 bucks is all I can say. 2Meters, 70CM bands. Can be used as police scanner, FMRS and MURS radio.
The stock software leaves a lot to be desired so I downloaded CHIRP and it works very well. I can load up repeaters from various sources and save the image of the radio etc. On my recent honeymoon through the Olympic Peninsula here in Washington State I was able to load up my radio with repeaters based on the counties I was going to be driving through.
I use this mostly at home with an outside antenna. Radioshack is among the many places you can get an adapter for this radio to connect to a PL-259. I built a couple different groundplane antennas that I have used to participate in a few local area Nets. I do have a little bit a trouble hitting all the repeaters which I thought was due to coax loss but a few tries in the car and just out in the yard with stock antenna I still feel a bit under powered. I run into a lot of I can hear them but they can not hear me. I am keeping my eyes out for a mobile with a little more power or a linear amp.
I had picked up a Daiwa CN-103L SWR/Power meter from a friend and both of the antennas I have made tuned up nicely, so I will connect to the repeaters I can until I get a few more vhf/uhf watts under my belt.
I recently received the Call Sign KG7FDJ after passing my FCC Element 2 Technician test enabling me to operate an amateur radio on certain frequencies.
I used to be avid blogger about 10 years ago and have recently been looking for something to write about again. I like to write, I like most of you I have an opinion and like a lot of other older internet users I began my writing on the internet by being active with my opinion and words on forums and networks of blogs. Most of the words read or written had a certain heat to them fueled by politics and religion. Since those days I have lost most of my emotional energy to muster up a public opinion. My need to express my opinion was kept in check by my wisdom. My dad always told me never discuss politics or religion, little by little I listen to my father even though it takes me roughly 20 years per piece of advice.
Ham radio, electronics are some of the things that occupy my thoughts and I want to document my progress into the higher FCC amateur licenses, the things I am going to learn, the things I might pass on and the fun I am going to have.
So welcome to my words, hope to read yours and hope you enjoy reading mine.