It is 1.4v1n4002 is OK. Need to get out your voltmeter and make a few readings to see where the problem is if you have time.
Disconnect the audio from the PC and read the voltage on the collector of Q1 to start. It should read appx .1 to .2 volts.
.693v so pretty much.7That's a problem. Remove D1 to separate the two transistor circuits. Read the voltage on the base of Q1 it should read appx .7 volt
Hold the phone. The 220 K resistor R2 was not making a clean connection to the plus supply..693v so pretty much.7
I can’t take a video on this webpage but what I’m hearing is the really rapidly opening and closing sounds like five× a second or moreSomething is not right. Remove the big blue capacitor so I can see the connections to Q1 and Q2 on the breadboard.
There might be a short gap between the pulses or the 22uf cap is not installed correctly.
Do you have a scope to see the audio from the PC?
this particular band suffers in the winter months due to atmospheric conditions at this frequency. I know I am transmitting because I can see my call sign being spotted on the website and I am receiving stations but I have yet to make an actual contact.Nice. Are you satisfied with the circuit or does it need any improvements?
no sooner did I click send on my last post did I make the first of two connections using the interface. Attaching a screenshot of what it looks like on the computer went to ham radio stations exchange location and signal reports. So it works!Nice. Are you satisfied with the circuit or does it need any improvements?
well now I have to report unfortunately some thing has happened and I am not getting the right level of audio out of the circuit to drive the transmitter. The attached picture of the scope is what I see coming into the circuit from the laptop, what I see coming out of the transformer, and what is going to the radio. The laptop is sending the maximum level of audio that it can which is what I need to trigger the relay.Nice. Are you satisfied with the circuit or does it need any improvements?
Do you have a link to this circuit? I like the 555 it’s an old friendIn ham-speak, the function desired is called "vox", short for Voice Operated Transmit. That sort of circuit has been published in every Radio Amateur's Handbook since the early 1980's and is fairly well designed. It uses a quad opamp, a 555 timer IC, and a single transistor, and will run on 12 volts. The circuit in this thread will also work, but the value of C2 will need to be reduced.
And the power and common connections as shown will be a bit confusing.