Ramsey Electronics PR20 manual A 220 MHz “ACTIVE ANTENNA”

A 220 MHz “ACTIVE ANTENNA”

For situations where a simple indoor receiving antenna is needed, the PR20 preamp will add considerably improved performance to a whip antenna adjusted to 1/4 or 5/8 wave. And, for a very well engineered true active antenna for both HF and VHF at a break-through low price, take a look at our new model AA7 Active Antenna kit which features an on-board battery supply, adjustable gain control, heavy-duty whip, HF-VHF mode switching, and jack for using external antennas.

T-R SWITCHING CONSIDERATIONS FOR TRANSCEIVER OPERATION

If you wish to use the same antenna for transmit and receive, T-R switching is, of course, essential. The T-R switching may be any of the following:

•manual in-line switch (NOT recommended for VHF/UHF)

•relay controlled by push-to-talk line

•RF sensing T-R relay (Ramsey Kit No. RFS-1)

•PIN diode T-R switch

PIN diode applications are discussed in amateur radio magazines and the ARRL Handbook.

PR20—11