Welcome to the N1IR Electronics Website. Totally off the cuff, one take, unrehearsed video projects for anyone interested in amateur radio, electronic design, makers, hardware hackers and science.


Get off your duff and build something!
Training the hand and mind since 1982.

Friday, April 26, 2019

Greetings Barnstable County Sheriff

Greetings Barnstable County Sheriff,

Below is examples of some portfolio projects that I have done,

Click here to see my résumé


ELT/EPIRB Detector - Capstone Project

The design I came up with was a pager size device that would alert a pilot there ELT or Emergency Location Transmitter was on. A lot of time
NBEMS is Narrow Band Emergency Message System. Think back to your last public service event, drill, or deployment. You probably passed a lot of traffic best suited for voice communications but...What if you had been asked to pass Roster of evacuees, Required prescription medications, Directions to a disaster scene. The needs of our Served Agencies have changed. They still need voice communications but...There's an increasing need for data communications. We need to be able to provide more than just voice communications from a ham with an HT when we got called out to search for these ELT's they were false alarms in fact over 59 out of 60 of my documented finds were false activation's. I wanted to design a product that a pilot could wear or throw in his fight bag that if there was a signal on 121.500 Mhz (121.775 prototype) and was less than 200 feet away it would beep.
 Link below

Amateur radio saves lives!
On 9/25/2014 I received a distress call and saved a life! Mike a diabetic could not get up from his chair and called for help over amateur radio.
 
 Link below
 
Custom 2 Meter Radio Install
This was a custom install for a 2000 Toyota Camry with custom machined radio trunnion to a single DIN mount.

 
 Link below
  
Narrow Band Emergency Message System Interface
NBEMS is Narrow Band Emergency Message System. Think back to your last public service event, drill, or deployment. You probably passed a lot of traffic best suited for voice communications but...What if you had been asked to pass Roster of evacuees, Required prescription medications, Directions to a disaster scene. The needs of our Served Agencies have changed. They still need voice communications but...There's an increasing need for data communications. We need to be able to provide more than just voice communications from a ham with an HT

Link below

The Ignition Switch Delay for APRS node
"The Ignition Switch" featured in QST Aug09. This circuit provides protection against transient protection when starting your car and proves a delay off time for APRS equipment to send data before shut-down.


Link below

Pneumatic Antenna Launcher
This air-powered launcher is designed to launch sabot round over trees towing fishing line. The fishing line is used to pull up nylon twine and wire antennas, or heavier line and larger antennas. These launchers are used by Amateur Radio groups doing Emergency Service and other portable work, as well as installing antennas in backyard trees.

Link below


N1IR Tape Measure Beam Antenna
Here is an article I wrote for the next GARS Club Meeting. During the next club meeting on 3/26, we will be constructing Direction Finding (D.F.) antennas made from PVC pipe and steel tape measures, the nice thing about this antenna you can transmit on it as well with a pretty good SWR. A Kit is available for this antenna build just shoot me an email.
Link below


VOIP Echolink handheld microphone to PC interface
I wired up a Kenwood MC-58 to have more of a radio feel to Echolink.



Echo Link Demo Video
EchoLink is a computer-based Amateur Radio system distributed free of charge that allows radio amateurs to communicate with other amateur radio operators using Voice over IP (VoIP) technology on the Internet for at least part of the path between them. It was designed by Jonathan Taylor, a radio amateur with callsign K1RFD.




Astron Power Supply Fix
We were contacted by a local HAM radio operator that is blind about a power supply that runs his HF radio. The power supply was a ASTRON 30 and did not function. The students were excited about taking on this job, we troubleshot the problem down to a faulty regulator and bad crowbar circuit protection. The student got to learn about transistor Voltage Regulator and Silicon Controlled Rectifier used a a over voltage crowbar protection circuit.
Link below


Motorola GTX 900 Accessory Connector 
A write up on the Motorola GTX 900 Accessory Connector, our amateur radio club had bought a surplus lot of (50) GTX900 that I modified for 33CM amateur band
Link below
http://www.n1ir.com/2014/03/motorola-gtx-900-accessory-connector.html


Sealed Lead Acid Battery Monitor (SLAB_M)
This circuit was to monitor a Sealed Lead Acid Battery, if the battery drop below 10.6 volts a buzzer would sound. The challenge was to have a quiescent current smaller that the self discharge rate of the battery
Link below