EICO 324 Signal Generator Amplitude Modulation micro AM-broadcast

[chefbob5]

I have two more questions Doc. did you make a special cabel from the RF Out on the 324 with a probe on the other end? 2. What did you use to split the Sine wave side of the Hickok? Once I have that answered I think I can make this work.

Thanks, Bob

[DrZEEworkshop]

@chefbob5

Pause the video at 1:08

I have diy-made probe for old RCA VTVMs that has the same 5/8 connector, that's what I am using at RF OUT (yellow handle) , I grabbed the tip of that probe with Oscilloscope probe's hook-clip (channel B).

I have Banana connector at SINE output, dual-banana connector to alligator-clips cable (goes to EICO AUDIO In/OUT) , and! from dual-banana another banana-to-alligator short cable clipped to oscilloscope's probe tip Channel A.

read next post....

[DrZEEworkshop]

@chefbob5

ok...Bob,

so that's what I had, but you don't need any special connectors, you can simply use couple of short wires to split signal and use binding posts for connection. You even don't really need coax cables for sine audio signal, just keep the units close to each other so the wires are as short as possible.

Get yourself a bunch of small alligator clips, radioshack has them, you always need those around :)

[chefbob5]

Nice video, but its hard to trace all the wires you have. I have pretty much the same equipment, Eico and Hickok and a Teck 4 channel scope. Can you give me the basic wireing you show here?

[DrZEEworkshop]

@chefbob5

Sine generator (audio source/CD player) OUT split to 324 AUDIO IN/OUT and to Oscilloscope CH1

Connect some probe (yellow handle in the video) to 324's RF OUTPUT that will act as "transmit antenna" and connect that probe to Oscilloscope CH2

Set 324 to RF.EXT.MOD and RF COARSE to Hi

Set your scope for good viewing of the forms, sinc to CH1 (audio)

Start "broadcasting" :)

With this set up I could pick up the signal through out the house

Let me know how your experiment going

/mike

[chefbob5]

@DrZEEworkshop Would you possibly have a copy of the manual for the HIckok 4800? I have had mine for quit a while and can't find the manual . If you have one perhaps you can make me a copy or scan it in?

Bob

[DrZEEworkshop]

@chefbob5

are you talking about SG-4800 test-set?

I don't have any papers about it.

You may try contacting Steve at stevenjohnson d o t c o m , maybe he has.

/mike

[chefbob5]

@DrZEEworkshop I am looking for the first part of the video using the Transistor Radio not the cd player. Thanks

[DrZEEworkshop]

@chefbob5

Bob, the transistor radio is the AM Receiver in "both parts" :)

In the first part the AUDIO that is being transmitted is the SINE-WAVE from Audio (Sine) Generator, modulated in and "transmitted" by EICO 324, the radio is receiving it, and you hear the TONE sound.

The second part is the same set-up, but the audio comes from CD-Player instead of Sine-generator.

[chefbob5]

@DrZEEworkshop Mike, the RF-Out on the Signal Generator takes a special connector which I need to make up some cables other then the stock one it came with. What the hell are those connectors called? I can not remember for the life of me. Thanks Bob

[DrZEEworkshop]

@chefbob5

Bob, look for so-called 5/8 or 5/8" or 5/8 inch vintage connector, sometimes people simple call it as "vintage mic connector", sometimes as "5/8 screw on" connector.

Also you can try without anything being connected to output. Simply place your AM radio right next to 324 and you can pick up the signal. But of course if you want to connect the output to oscilloscope then you need to figure it out. Alternatively you can replace that 5/8 with more common BNC or even RCA type jack.

[chefbob5]

@DrZEEworkshop Actually after 3 hours of research I found it. I had remembered that it looked like a old microphone cable from my youth. And in fact it was the connector from a vintage Heathkit Mic. I dug a little further and found they were called a Switchcraft Connector 5/8" 2051F (for female). I looked on ePay and they wanted $10 a piece so then I went to Allied Electronics and bought 6 @ $4.26 each. Now you know where to get them and what they are called. Thanks

[DrZEEworkshop]

@chefbob5

huh huh , looks like we are talking to the same mic at about the same time LOL

[Nabo00o]

Very nice demonstration! Useful to see whats going on.

Next step: Frequency modulation! (that is if you have the equipment and time ;D)

[Hansolo60]

I want pulsed DC

[DrZEEworkshop]

@Hansolo60

"Pulsed DC" is practically (in real world, that is) a "square wave" AC.

Check wikipedia for "square wave".

The thing is that you want to have high voltage "puls" and personally don't know how to build one. I'd imagine you can find the info somewhere. Also, building and especially experimenting with such devices is NOT for an inexperienced in electronics person. I can't be sure, but the nature of your questions suggests to me that you need to learn some basics :)

/best regards :)

[Hansolo60]

Why not using a transformer after modulating the frequency and get high voltage out of it ;) ??

[Hansolo60]

I want to perform a science experiment with 1000 volts pulsed DC. The frequency I'll take from that generator. It won't burn out, right?

[Hansolo60]

The signal generator circuit is an independent circuit that does not affect foltage or current in the primary circuit that we want affect. Is that correct? For example I want to make pulsed DC circuit at 600 Hz with 1000 volts voltage. The device there will not burn out?

[DrZEEworkshop]

@Hansolo60

I am not sure what is your question about.

Do you worry about the generator being "fried" or about your monster machine that you are building? :)

[Hansolo60]

Yes, I worry about the generator being "fried". It won't, will it?

[DrZEEworkshop]

@Hansolo60

uh, I see.

well, I have no idea what exactly you are up to with your "device" that you are planning to build , but in general....

A signal generator provides a low power (and low voltage) AC signal. You can apply this signal to an input of a circuit with input impedance equal or higher than output impedance of the generator.

There should NOT be any voltage on the input of the circuit you design, if there's - then you are doing something WRONG Make sure you know what u'r doing :)

[DrZEEworkshop]

@Hansolo60

are you up to something like this device, DEI HV1000 Pulse Generator

????

I can't post link here

google it, :)

[Hansolo60]

Yeah. I want to build it. Any schematics?

[DrZEEworkshop]

Yes. You can apply the output of 324 to various stages of a tv/radio receiver under a test or repair. I have zipped manual for Eico 324 downloadable, see the link to the page in the video description. There some applications described in the manual.

I am not into radio repair myself, I am mosty into amps, recorders and mus.instruments., so I don't know much about details.

Also this video is about "fun experiment", this isn't a demo of what this generator was actually designed for :)

/mike

[stevenv1992]

Could you connect directly to the AM radio receiver from the signal generator.