VEC-1290K Instruction Manual
AM Radio Transmitter
Getting the most range: The transmitter antenna system is most efficient at the
higher frequencies. The new expanded AM broadcast band between 1610 and
1710 kHz is still relatively free of new station assignments. Likewise, many
VEC-1290K's will make it down to as low as 530 kHz, a relatively quiet
frequency in most areas.
Try to locate the VEC-1290K transmitter in area that is free of metal support
structures. Remember that the VEC-1290K may be remotely located; use
shielded audio cable to run between the transmitter audio input back to the
"station" location. Another "trick" you may try is attaching a good ground to
the transmitter cabinet. This will improve the antenna radiation efficiency.
Always run the six-foot antenna wire in a straight line, never coiled or zig-
zagged.
Understanding the FCC rules:
Federal Communication Commission (FCC) rules and regulations governing
unlicensed AM broadcast transmitters are complicated and technical. Devices
such as the VEC-1290K AM transmitter are covered under Part 15 of the FCC
rules and regulations.
Part 15 rules permit a maximum field strength of 24000/fkH
z
uV-per-meter at
30 meters, between 510 kHz and 1710 kHz. The rules also permit a 100-mW
transmitter with a ten-foot antenna, including the feedline. In order to meet Part
15 regulations, the transmitter output must be kept below 2 volts rms when
using a 50-ohm antenna. The high-impedance antenna and power level of the
VEC-1290K meet FCC Part 15 requirements.
Your responsibilities under Part 15. Unlicensed devices operating under Part
15 must not cause interference, and must accept interference as a part of their
operation. What does this mean in plain English? If your station is causing
interference to the reception of a licensed broadcast station in your neighbors'
radios, you are in violation of FCC rules and are operating illegally.
Either
operation must be suspended, or a new clear frequency found.
If
broadcast stations are interfering with your broadcasts, this is something you
must accept being a micro-broadcaster under FCC Part 15 regulations.
.
Here are some guidelines to
1. Identify your station regularly, stating your location and purpose. Do not
make up FCC call letters! You can use an ID along the lines of "This is
Radio 910, operating from New York City".
2. Never transmit false distress signals!
3. Avoid profanity or indecency.
