Very simple KISS project. On the video the converter has no antenna of its own connected. Does it work without one? For those of us that don't possess an airband radio: does the converter work with a suitable cristal (37 MHz?) for the FM-band?
The diode mixer would have 130 MHz as well as 160 Mhz. This might work with a NOAA weather receiver that is tuneable (not the preset ones). I might just try this if I ever get my 2M J-pole put back up. Don't have any quality gold bond germanium diodes but a Schottky diode should work.
@@vk3ye ah, i was gonna ask the same thing but you are saying because FM recievers are 75khz wide but ham FM is only about 5khz, the deviation will be a very low volume? You are basically just using the AM reciever then as a slope detector instead, is that correct?
Great concept for a project for beginners, however, when building vhf projects, there is no such thing as a short circuit. Your lead lengths are way too long and must be as short as possible. This in itself will vastly improve selectivity. Re tuning the variable capacitor on the front end tuned circuit, 5-25 pf for tuning- It obviously works when you have the airband receiver on a "fixed frequency" A better way is to tune this tuned circuit to midband and then use the airband receiver as a tunable IF, This method works extremely well. Build this deign as an initial project, but keep the leads short, then, experiment and improve the build with "tighter" double tuned circuits, especially in the front end. The principle of this is what a superhet receiver is, the combining of the sum and difference frequency between the local oscillator and the the incoming signal. Ron Bertrands "radio & electronics school" explains the principles very well. I have built many converters in my time, using old "junk" crystals. I am happy to help anyone if they wish to ask me, 73"s, Barry, VK2FP/AG6VC
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I love playin around with converters. I built one to listen to weather band on 2 meters. Will build this one. Great video
Cool project might try it
"cb radios back in the old time"...lol i use it more than ham these days
Very simple KISS project. On the video the converter has no antenna of its own connected. Does it work without one? For those of us that don't possess an airband radio: does the converter work with a suitable cristal (37 MHz?) for the FM-band?
It needs a good antenna as it's deaf. It won't work for the FM band (in either direction) for multiple reasons including modes being incompatible.
The diode mixer would have 130 MHz as well as 160 Mhz. This might work with a NOAA weather receiver that is tuneable (not the preset ones). I might just try this if I ever get my 2M J-pole put back up. Don't have any quality gold bond germanium diodes but a Schottky diode should work.
If I add 60mhz crystal on this converter. Then I can receive 145 mhz frequency on
80MHz FM band?
In theory yes. In practice no. FM receivers are wide deviation and any 2m FM activity will be very quiet if heard at all.
How to receive 2m on common fm radio receiver
@@vk3ye ah, i was gonna ask the same thing but you are saying because FM recievers are 75khz wide but ham FM is only about 5khz, the deviation will be a very low volume?
You are basically just using the AM reciever then as a slope detector instead, is that correct?
@@researchandbuild1751 Correct.
Great concept for a project for beginners, however, when building vhf projects, there is no such thing as a short circuit. Your lead lengths are way too long and must be as short as possible. This in itself will vastly improve selectivity. Re tuning the variable capacitor on the front end tuned circuit, 5-25 pf for tuning- It obviously works when you have the airband receiver on a "fixed frequency" A better way is to tune this tuned circuit to midband and then use the airband receiver as a tunable IF, This method works extremely well. Build this deign as an initial project, but keep the leads short, then, experiment and improve the build with "tighter" double tuned circuits, especially in the front end. The principle of this is what a superhet receiver is, the combining of the sum and difference frequency between the local oscillator and the the incoming signal. Ron Bertrands "radio & electronics school" explains the principles very well. I have built many converters in my time, using old "junk" crystals. I am happy to help anyone if they wish to ask me, 73"s, Barry, VK2FP/AG6VC