Ramsey Electronics PR40 Guide de dépannage télécharger pdf (Page 11)

PR40—11

A 440 Mhz “ACTIVE ANTENNA”

For situations where a simple indoor receiving antenna is needed, the PR40 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.

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Ramsey Electronics PR40 Guide de dépannage Page 11