- Legal to
use in the US, no FCC license required
compliant with FCC Part 15 regulations
- 100 mW
- 20Hz to
20kHz ±1 dB Audio Response
- Very Low
- 10 kHz
and 9 kHz channel spacing options
Quality PC Board and Components
VIEW MODULATION AND FREQUENCY RESPONSE
Favorite Songs and Shows
audio from any source with a headphone or line out jack to any AM
radio or AM tuner.
- Not happy
with the programming on the AM band? Play what you want to hear,
when you want to hear it -- CDs, MP3 audio, Internet Radio, Satellite
Radio, Cable Radio, FM tuner, Microphone -- any audio source.
AM radio is coming. Your AM radios may become obsolete. The
AMT3000 enables you to re-transmit from a digital tuner to your
favorite old radios.
- Have an
old radio or an antique radio collection? Play old-time radio
programs from cassette, CD, satellite radio or internet radio and
re-create the ambiance of the golden age of radio.
- Have an
old Hi-Fi AM tuner? Experience its full capabilities with a
wide-band signal source.
- Use as a
classroom demonstrator and teaching aid for electronics instruction in
audio, RF, digital, PLL, and amplitude modulation concepts
About Transmitting Range and Antennas
Expect about 50 to 200 feet range, depending on
local conditions, with the standard wire antenna. The signal will be very
strong everywhere within your home.
If you want to maximize your range, check out
our instructions for building a Part 15 compliant outdoor base-loaded
vertical antenna. Expect 1/2 to 3/4 mile strong-signal range as received on
Thanks to a great contribution from one of our
very inventive customers, here is a PDF file showing how to modify the
antenna with a sleeker in-line coil.
TO ANTENNA PLANS FOR IN-LINE COIL
Constructing the base-loaded antenna is made a
lot easier thanks to Carl Van Orden. He sells the complete tapped coil,
wound on a section of 3” white PVC pipe as shown in the plans. This is the
most difficult part of the antenna to fabricate. Carl also sells ground
radial systems. For more information and prices, click on the following
link to see Carl’s page.
COIL AND GROUND RADIALS
quality audio compression and limiting maintains 100%
modulation regardless of audio input level. Adjustable 1:1 db to
5:1 db compression ratio. Audio levels above the adjustable
limit level are compressed at 15:1 db ratio.
frequency response of modulated RF carrier is 20Hz to 20kHz ±1 dB.
selectable flat or treble-boost audio curves. Treble boost
pre-emphasis will compensate for the typically poor high frequency
audio response of most AM radios.
controlled frequency synthesizer covers entire AM broadcast band in 9
kHZ or 10 kHz steps, depending on order option.
milliwatt final input power, the maximum allowed by FCC Part 15 for
legal, license-free operation
modulator and RF output stages yield high quality modulation right up
antenna matching circuit matches output to short antennas without the
need for additional loading coils.
- Two audio
input jacks are mixed to convert a stereo source to mono or to mix two
separate mono sources.
voltage regulators and an on-board, RF-bypassed, bridge rectifier
assure clean, hum-free power. The matching AC adapter wall
transformer is included.
- Very low
AC power consumption for worry-free continuous operation.
quality double-sided printed circuit board has top and bottom solder
masks and a top silk screen legend to clearly identify component
for ease of assembly. All components mount on the printed
circuit board. No time consuming discrete wiring required.
plastic enclosure. Front and rear panels are pre-drilled and
instruction manual guides you, step-by-step, through the assembly
process to reduce the chance of errors during kit assembly.
- Kit is
educational and fun to build.