Category Archives: Audio
Ham radio audio applications
As soon as I get my Yaesu System Fusion FTM100-DR online, I want to mate my Bencher paddles to the new MFJ-490X Menu Driven Memory Keyer that I picked up at the 2016 Dayton Hamvention last week (May 21, 2016). I am itching to get these two toys working in some CW / More Code Contesting very soon! 5 programmable memories plus all sorts of keyer speed, weighting, side tone, hand key capability, serial number decrements, random code practice, iambic settings, etc.
(See video below!)
MFJ-490X Memory Keyer Instruction Manual
Here is an excellent YouTube video from RimstarOrg that breaks down the concept of how crystal radios actually DO their magic! Yes, MAGIC. Radio signals are all around us 24 hours a day. Invisible! You can’t really touch them. You can’t smell them. You can’t hear them without assistance. We don’t really feel them bombarding us. We don’t sense those signals without some mechanical help… but they strike us with many different frequencies constantly… so let’s explore the range of frequencies we can decipher with a homemade crystal radio set!
THE BEST Multimeter Tutorial
The voltmeter… the Volt-Ohm Meter… the Multimeter… digital or analog… continuity… amperage, voltage and ohms… COME ON, MAN! What is it and how hard is it to use in the every day life of a ham radio enthusiast or just someone working in their workshop? Once again, Afrotechmods has an excellent tutorial on his YouTube channel for us to learn from!
The Pro 7 offers a feature set that compliments the Heil Sound standard for headset design. Unlike copies of various aviation type headsets, the PRO 7 is not a copy. It brings newtechnologyto the headset industry. The 2″ thick gel foam ear pads provide extreme comfort for extended periods of time while exhibiting passive noise reduction rated at -26dB, ideal for use in high ambient noise environments. Using technology Bob Heil learned from Paul Klipsch back in the early 70’s, the ear cup enclosures were tuned to the free air cone resonance of the speaker cone thus providing very low distortion with maximum voice articulation providing the ultimate sound reproduction for communications. Theexclusive Heil Phase Reversal system (HPR) allows you to acoustically move the signals forward and creates a spatial widening of the sound field. This feature makes it easier to pull a weak signal from a pileup – useful for DxPeditions and contests as well as a stress reliever as your change the phase angle of the program source. A speaker balance control allows preferred level between the speakers.
The PRO 7 has interchangeable microphone system allows the microphone element to be easily changed in the field for different types of applications. The low distortion Dynamic HC-7 element exhibits a frequency response of 100 Hz – 12 kHz with the -3dB points at 100 Hz and 12 kHz. The traditional Heil speech articulation rise is centered at 2K -4KHz with properly balanced highs and lows. The impedance is 600 ohm. The HC-7 is one of our best microphone elements for speech articulation.
Designed exclusively for iCOM radios, the iC Electret element has a -3dB fixed point at 35 Hz and 12kHz with the sensitivity of-48 at 1500 ohms output centered at 1kHz. The iC element solves the problems with LOW GAIN ICOM radios but can also work with great results on newer Icom models. Bias power is applied to operate the iC electret element. The Pro 7 iC is supplied with our ADl-iC eight pin iCOM adapter cable.
The Pro 7 and Pro 7iC come in black, red, blue or pink.
The balance control located on the LEFT speaker, controls only the left speaker. Begin by setting a comfortable right side speaker level with the AF gain of the receiver. You then adjust the left side speaker where necessary to balance the audio between the speakers. In most cases the balance control will be close to or maximum.
Afrotechmods is a very insightful and easy to understand YouTube channel to follow on basic electronics. Here he talks about multimeters and their usage in our ham shack. I have several different digital and analog multimeters and their usage often depends upon the application and project. He does other excellent videos, so check him out!
If you are going to connect audio equipment devices you will most likely run into the XLR male and female connectors at some point. Or maybe you need to repair a cable that is no longer working. This video is a good example of how to make the proper connections! It’s not difficult to do.
For those of us Hams with old ears, I highly recommend looking into Bob Heil’s solutions for professional quality headsets. I have an older Heil headset I used many years ago but now am considering the model below for added quality as my hearing ability is considerably lower than it was… really thinking about either the Pro-Set or Pro-Set Elite model. Bob Heil is a legend in professional audio and worked with Joe Walsh, Peter Frampton (Bob invented Frampton’s “Talk Box”), Jeff Beck, Slash, Richie Sambora and The Who… so he KNOWS audio! Also, check out the video below that tells what the audio industry thinks about Bob Heil… and hear some of the great music he was responsible for.
Click link below for the Heil Sound website…
If you are looking for coax, antenna wire, connectors, rotor cable, insulators, rope or the tools to make antennas Davis RF Company is a place I like to use.
Click link below to go to the Davis RF website…
Another great YouTube show! Ham Nation
This episode speaks about hooking up and audio mixer to your transmitter with Bob Heil and Gordon West, et al. Every show is packed full of information about many different facets of the hobby. Watch them all! (Segment begins at 41:45 in the video…)
Hosts: Bob Heil (K9EID), Gordon West (WB6NOA), George Thomas (W5JDX), and Leo Laporte (W6TWT)
I have built four different radios from Ramsey and they are fun to build, easy to layout, and you learn a lot of radio design. Built the 40 Meter QRP Receiver and Transmitter, the Aircraft Receiver, Infrared Transmitter and Receiver kits. A great way to pass a rainy day! (Click link below to go to their website…)
BPSK31.COM does a great job of explaining how to get on the air with PSK31 technology. (Click link below for another excellent resource.)
Running PSK31 on Field Day in 2014 was a BLAST! We soon learned that a set a easy to use macros sped up our contacts in the contest. The link below is an excellent resource to consider.
Need to figure out what cables to use or what the pinout configuration should be? This is a nice resource for just that!
Welcome to the Hardware Book. Internet’s largest free collection of connector pinouts and cable descriptions. (Click the following link…) http://www.hardwarebook.info/
This is the 12-Channel audio mixer I picked up at the 2014 Dayton Hamvention Flea Market for $50… and I love it!
This video will help explain how to create and audio mix with a mixing board.
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This video can be helpful when connecting gadgets to your audio mixer to route to the speakers.