[AMRadio] Two tone audio generation

Robert Bethman oldrotorheadsarge at outlook.com
Fri Aug 4 12:44:18 EDT 2017


I use these function generators for all sort of work.  They run right around $10 on the Bay.
They cover 1Hz to1MHZ.  They are very useful and produce sine, triangle and square wave outputs.

I obtained them already built, and in their own case.  They use 9VDC to run them.

I have a 30VDC 10A power source, and DC to DC adjustable voltage modules.  I also have a bunch of 3 digit LED voltage meters that will read down to the 1/100th volt when running in the 9VDC range.  They are powered by the power source when using a minimum of 2.7VDC.

A handful of these ran $10 also.

My only real expense has been the Rigol DS-1102E.  It was worth everything invested.  Reads up to 100MHZ, dual channel, full digital processing, and a display that gives voltage, frequency, and period on the display.

I keep computers out of the shack.  Mine are full tower systems with 25” HDMI Displays.

I avoid RFI like the plague.

Regards, N0DGN

From: Jim Candela [mailto:jcandela at prodigy.net]
Sent: Friday, August 04, 2017 10:04 AM
To: Robert Bethman <oldrotorheadsarge at outlook.com>; AM Radio List (AMradio at mailman.qth.net) <AMradio at mailman.qth.net>
Subject: Re: [AMRadio] Two tone audio generation

For a hardware based setup consider these options:

Look at this:  (about 49 bucks USD)


Or this one from Elecraft for $69:


For a PC based version using the computer sound car, consider this free signal generator. Look for SigGenFreeware....For two tone, run two of them at the same time:





From: Robert Bethman <oldrotorheadsarge at outlook.com<mailto:oldrotorheadsarge at outlook.com>>
To: "AM Radio List (AMradio at mailman.qth.net<mailto:AMradio at mailman.qth.net>)" <AMradio at mailman.qth.net<mailto:AMradio at mailman.qth.net>>
Sent: Thursday, August 3, 2017 10:51 PM
Subject: [AMRadio] Two tone audio generation

One could either make or purchase two XR2206 Signal Generator Module DIY Kit Output 1Hz-1MHz Adjustable Frequency A6Q9.

It would most likely be cheaper to buy the kits rather than purchasing all the parts.

I use my Rigol to set the two at 400Hz and 1KHz.  combine the two signals.  [  Pay attention to polarity! ]

Feed them into a pretty small speaker.  These signal generators must be impedance matched to the speaker!  They output @ 600 ohm impedance.  So work out what you need for what speaker impedance you have at hand.

I use an acrylic tube with a few holes in it to allow for airflow yet don't pick up exterior noise.  Decent open cell foam will work fine.

Place the radio microphone inside the far end.

Now you have a darn good two tone generator to feed the microphone with a signal that you have set the output level and frequencies.

Observe the radio output with your monitor scope.  [  Don't forget to use a dummy load!  ]  I have a 400 Watt one at hand.  That will handle *most* exciters.

Regards, N0DGN

A.R.S. N0DGN [ Licensed Since 1980 ]
Callsign: WitchDoctor

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