I tried to lean on one of these back in the early 80s, borrowed it from a friend who had stolen it from his high school ;), big complaint it would do one to three chip circuit but after that you ran out of room and the only result was frustration. There is only so many times you can make the same blinky light circuit and not not get board and frustrated as a teen.
My dad brought an early one back from the States and we built up a 32K system over time - eventually with an RX-01 8" floppy drive from a PDP-11 which fell off a truck. Good times. It drew so much power, when overclocked to 2MHz, I had to cool the thing with fans and heatsinks! I think, from memory, we were paying about $25 for each 2114 memory chip - at only 512 bytes per chip!! Edit: with help from the local gurus at DIGITAL I believe we were able to get the RX01 drive to RW at 480KB per side for a total of 960K, on each IBM diskette. After 1KB/s via cassette, it was miraculous.
I've restored several Mohicans and have never found a defective transistor. It was one of the first radios to use crystal (ceramic) filters in the IF section: no IF alignment and fine selectivity. The whip antenna is massive and the radio receives better than most modern portables I own on AM with built-in antennas. SSB is unusable because of temperature sensitive oscillator drift. A nice radio for any collector. Long live AM!
Hello Jeff, a very nice project. I am trying to find the 0.1 inch female connectors to slide onto the flexible flatcables. Where did you find these or do you have a specific name to search on? Using these makes it much neater and flexible.
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That VTVM is a very useful piece of equipment. I have a Heathkit V-7A VTVM, I restored it and it's in excellent condition. I'm using it to align radios, I too am a ham operator. A good VTVM is as useful as a good oscilloscope.
I think the solderless breadboard is the same size as the separate one you showed, minus the snap-on power rails. Visually it looks small, but once you deduct the power rails you have the same number (or very close to) of tie points available.
Excellent idea and very easy to follow explanation!! I have two Heathkit VTVMs models IM-11 and IM-18. will work on them to change to self powered for resistance range.
Harmonic on most band are not a feature but a side effect of a simple or weak design. This problem is cause by too much feedback to allow to cover a wide band.
Did you ever upload the manual? I just ordered One of these from eBay in unknown condition other than it powers on and could use any information your willing to share!
My understanding is they were mostly used in PCMs (Power Train Control Modules, see en.wikipedia.org/wiki/Powertrain_control_module) which would be proprietary software specific to each car manufacturer and probably not running under an operating system as such.
Dear Jeff, if possible, I would like to receive the Signal Generator Heathkit IG-42 manual in PDF via email Thank you, Fernando - Parnamirim - RN - Brazil..
Your presentation was very informative, I remember the CB Radio craze I was into it Radios, Towers and Mic's. D104 and the "Screaming Eagle" Radio with a set of "MoonRaker's " thanks !
FWIW, back in the late 70s, there were two major chip-makers with "MOS" in their name; MOS Technology and MOSTEK. In my world at the time (electronics/computer engineering) everyone I knew or heard from (including the people at these companies who would answer phone calls) pronounced them as "em-oh-ess technology" and "mahss-tech". At least in my own experience, it has only been in more recent times, when a lot of people who were not in that industry at the time, or where simply too young to have been involved, have come up with different pronunciations. Kinda reminds me of electronic hobbyists these days who say "Jam-ee-co" for Jameco Electronics, because that's what it looks like and they were not around back when that company as called James Electronics and know to call it "Jame-co."
There is no reason you can't implement a Q multiplier with transistors, but by the 1960s crystal and ceramic IC filters allowed receivers to be more selective and Q-multipliers were no longer popular, so when radios went solid-state they were no longer used.
I built many of their kits . . . test equipment/audio/RC/TV's. My scopes and meters still work after 50 years.The Heath TV's were excellent, I built a 25", 13', and 19' before they were bought by Zenith. When that name went on, the quality went down! Our 27" Zenith came with all the boards and harnesses assembled in Mexico . . . not as fun a project or with the quality components of the Heath sets. On first power up, it kept blowing the circuit breaker. On examining the schematic, I found that the power supply harness was assembled wrong. The Tech at the Heath store said they had a whole production line like that causing much headache!
Very Well presented Video!! Clear and precise explanations. I look forward to other pieces of Ham Radio Equipment you may take the same approach with. THANK YOU!
Thanks, great video. I have three XR-2 Healthkit radios. My first radio didn't have any knobs. So, I purchased a second one to get some knobs. Then, I made more knobs for the other radio. Afterwards, I saw the third radio at a swap meet for $10.00. I couldn't resist, so now I have three XR-2 radios.
