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Tube AM Broadcaster Transmit music to your Zenith Scott RCA Sparton or Fada
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Tube AM Broadcaster Transmit music to your Zenith Scott RCA Sparton or Fada
Price: US $264.00
GUARANTEED 25 YEAR\'S PARTSAND LABOR YOU SHIP I FIX
American Made

Tube AM Broadcaster, Transmit music to your Zenith Scott Spartan Fada or Crossly
Now your antique radio can play some of the same programs it did when it was new!
With youriPad, iPod, nano, PC audio: Lap, Notebook, Desk Top, Cell phone audio and Tuners, CD players,

Cassette players, Stereo and Component receivers,
this two tube transmitter becomes
a miniature AM broadcasting station, patterned after the 1939 Zenith model S-7000
Wireless Record Player.
As per the F.C.C rules Part 15 this is a perfectly legal transmitter
And you need no license to use it.
The rules state that the transmitter may only transmit 100mw input
into a 5 meter antenna and transmit no farther than 200 feet
and this transmitter meets all these rules.
The transmitter electronically is overbuilt on purpose so that it will
last a lifetime. no part in this transmitter is overworked in any way.
And another big plus is if you get a power surge or spike this transmitter has a better
chance of surviving
than the transistor models out there.
Transmit tuning uses a ferrite core system that eliminates drift, once you set this transmitter to the frequency you want it will stay there like a rock.
The 12AU7 audio amp is full range and is sonically transparent to all frequencies,
And produces that rich warm sound only tubes can produce.Specifications
Power 115-120 volts AC
Power usage 9 watts
Size. 5 1/4\" High.. 7\" wide.. and 7\" deep.
Tubes 1. 12AU7 1. 6SA7
Frequency 550khz to 1650KHZ. default setting is 1000KHZ
Can go as far up as 1800khz for Europe on request.
Its easily tuned with an Allen wrench or hexagon radio slug tuning tool.
(Will gladly set it to transmit on any frequency you want)
(PLEASE tell me what frequency you want to use?)
Power in 1 volt peak audio power (headphone volume)
Power input to oscillator tube 100mw RF power
Audio. Grid modulated.
Antenna 15 foot of #20 wire
Frequency drift +- 2 cycles after warm up.Comes with
1. Transmitter
1. instructions
1. 5 meter 18\' antenna wire.
Email or phone technical support any time ( 702-463-4043 )Guarantee
GUARANTEED 25 YEAR\'S PARTS AND LABOR YOU SHIP I FIX
Shipment will be By USPS Priority mail.
Payment by Paypal, If you do not have Paypal I will take other forms of payment.
Thanks for looking
Rich

for more info
My Web Site


Transmitter Instructions

1. Attach the antenna and feedthe wire out (later after testing you can put up more wire to cover the wholehouse better.)

2. Plug in your RCA to minipatch cord into the transmitter and into your source of audio (headphone level)Use a headphone and make sure you actually have audio coming out of the source.

3. Set the transmitter volumecontrol to just barely on for headphone volume audio devices.

4. Plug unit into a 120 volt acoutlet.

5. turn on one of your radiosand set frequency to 100 or 1000khz (or the frequency you had me set it to)

6. Tune your radio to thatfrequency and you should hear your programming near the spot you tuned thetransmitter to.

7.Now that you haveit up and working you may want to add more wire so that all your radios willreceive the signal well.

8.Keep the Volumecontrol on the transmitter very low, I pre-set it to 9:00 and seems to work wellat that setting. (increase it if necessary)

9.If you need to change the transmitterfrequency use a 2.5mm Allen wrench orbest would be a plastic tuning tool 2.5mm, turn clockwise to go down frequencyand counterclockwise to go up.

Volume adjusting(Drive)

TheVolume control and volume of your source audio will have to be adjusted alittle to get everything sounding good, make sure your receiving radio is loudenough then adjust your audio source so the distortion disappears, what happens is if the drive either from thesource or volume control on the transmitter is too high it will over modulateand make the waveform not what it should be and comes out as distortion in thereceiving radio, so lean towards keeping it low

tillyou have it sounding good then crank it up slowly.

Have FunRichard

Post Script (PS) know the Allen wrench tuning sounds like alot of bother but its worth it because

A “permeability tuned oscillator”(PTO) is more stable than a variable capacitor in that it will drift very little.

The famous Collins radios allused a PTO tuned oscillator and also the Drake

Line.

Suppose the reason otherradio companies back then did not copy Collins is they had a patent on the PTO.

Other people make claims thattheir transmitter does not drift, but when a coil and variable capacitor arewarmed up slowly by the heat of a tube the capacitor plates become thickerbecause metal expands when it is heated, and the coil becomes larger when thecopper wire expands, what the result is the transmitter goes down frequency.

To compensate for what littledrift mine has on the coil is a small negative compensating capacitor that loosescapacitance as its warmed up, and like magic the transmitter drift’s verylittle.




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