Microphone & Speaker Information; A Few Antenna Considerations - Ramsey Electronics FX-440 Manual

MICROPHONE
&
SPEAKER INFORMATION
The FX transceivers with the hardware supplied are designed to accept
standard ICOM or !COM-compatible speaker-mikes such as MFJ-284.
The most conveniently available such unit is Radio Shack No. 19-31 O,
new for 1992.
Be aware that the receiver audio amplifier is capable of supplying a
husky 2 watts or more of audio power and will drive full-size
communications speakers to excellent volume levels.
The··pn switching circuit can be activitated simply by intrcx:lucing a
resistance (e.g. 1 OK) from the microphone input to ground. This .
resistance is enough to trigger the PTT circuit without interfering with the
microphone audio input.
Consider these factors in selecting microphone, speaker and/or
speaker-mike for FM voice operation. If your microphone and speaker
preferences differ radically from the use of a speaker/mike, and you do
not wish to alter the front panel, remember that you also have very easy
access to mike and speaker lines via J1, the packet connector.
A FEW ANTENNA CONSIDERATIONS
The idea of building your own transceiver is to save money and enjoy
your hobby. Effective VHF and UHF antennas are easy and inexpensive
to build, whether for fixed or mobile use. There are plenty of off-the-shelf
antennas to buy, but don't hesitate to •roll your own.•
If you are a newcomer to ham radio, you'll discover many strong opinions
about the "best" antenna to use. A home-built ground plane vertical or
even a dipole can provide very satisfying results. Whether you need a
gain factor or directivity in your antenna depends on your operating
goals. Regardless of the style of antenna, it really pays to give serious
attention to electrically-solid, weatherproof connections of the coaxial
cable to the antenna elements. A simple antenna in gocx:l condition will
outperform a fancy one that's been neglected.
Popular ham magazines and ARRL publications provide plenty of
antenna building ideas. MFJ Enterprises offers gocx:l value in simple
ready-to-use antennas for 440 MHz.
Ref. 16 FX-440