HP 606A Signal Generator AM Transmitter to Hallicrafters SX-28 Receiver Project

[rockangel1967]

i just got an old tube signal generator and i have a old Trio 9R59D receiver. but i might go and buy a eddystone receiver as well. as i dont have a surround amp, can i somehow hook up the cd player directly with my signal gemerator? its an AM/FM type 63a. i could reduce the signal with a resistor...?

[radiodad2008]

Signal Generator needs to have an external modulation input. The CD player may or may not work by itself and you may need to amplify its audio output. You can find audio amps at almost any 2nd hand store, old stereos or anything that will amplify audio. the input to the signal generator you should keep to 1 milliwatt or less, though some will handle more, even up to +30 dBm (1 watt). Build any simple antenna from the RF output port and experiment with what provides best results.

[rockangel1967]

@radiodad2008 thanks. do you mean a preamp by any chance? because a regular amp produces way more than 1 milliwatt. and as you mentuioned 1 watt + probably will smoke the signal generator....right?

[rockangel1967]

@radiodad2008 hello, i made it. my setup works perfectly haha. i LOVE it!

[icbrkr]

That's awesome.

[bamaslamma1003]

Is the modulation going into the generator at line level or speaker level?

[radiodad2008]

The modulation was at speaker level. I controlled the amplitude of the audio modulation on the Yamaha amp, and the RF signal output power at the sig gen. I found line out tended to over modulate the generator. Between the two I could get the modulation just right.

[geliegelie]

can you send me the circuit diagram of this.,

thanks a lot



[w9x7cv3vg6]

must be a pretty weak signal then down in the am band where signals can go pretty far but there you go..love the old time radio too lol

[radiodad2008]

The signal ouput power is about 0 dBm or 1 milliwatt, perfectly OK for in the home use. Range is only a few feet.

[targeteye]

I've done the same thing with my 606a. Interestingly enough I have good coverage in all of my house inspite of the low power output. I think it has to do with the 606A's ability to fully modulate the signal.

[targeteye]

I"ve done this with my 606a as well. Interestingly enough I get full coverage throughout my 2 story house. I think it is because of the ability of the 606a to fully modulate the signal. You might try it in different rooms.

[radiodad2008]

I have experimented more since, and the antennas and ground make a huge difference. I agree with your assessment of the modulation being a major contributor. No doubt about it. Thanks for the comments.

73!

[chosica50]

that was something! . where can i get one of those generators. and how much could I expect to pay? i supossed it can be use for many other applications

[radiodad2008]

Probably your best places to find one is at a local ham radio swap meet or hamfest, or on eBay. The 606B is excellent, as well as the HP 8640B. I actually now use an 8640B now as it is a bit easier to use. Prices on the 606A or 606B seem to run between $100-$150 US for one in working condition.

[paolo2paolo2]

beatiful radio

[amartinjoe]

nice!

[radiodad2008]

The signal carries about 5 meters depending on the voltage setting on the sig gen, and the receiving antenna on the receiver. None of my neighbors have been able to pick it up. It is pretty much in the shack only.

[bamaslamma1003]

How far does the signal carry?

[spiffy1238]

here's evidence that we can enjoy these receivers even after the signals eventually go away. Beautiful collection of radios here. Love that Marconi. Glad you enjoy the sx-28!

[targeteye]

very very nice. I've always wanted an sx-28.  Simply beautiful. Love that 606 too ;)

[coquimbano2]

Great production and a nice receiver. Congratulations :-)

[10mjt29]

greaat! i did not know you could get these on cd. thanks for telling us