Ramsey Electronics QRP20 manual Ramsey Electronics CASE, Knob & Hardware Option

is the Ramsey CW-7 CMOS Keyer, with built-in sidetone.

This transmitter is an ideal travel companion to the growing number of portable shortwave broadcast receivers which feature digitally synthesized tuning, memories and other features, provided that a BFO for CW-SSB reception is one of the features. In most cases, transmitter keying can be monitored directly from such receivers without too much overload, though it may be necessary to rig a simple switch to mute or attenuate the audio or short the antenna input to ground while transmitting.

THE RAMSEY ELECTRONICS CASE, KNOB & HARDWARE OPTION:

Your finished transmitter can be installed in a variety of enclosures of your own design and choosing. You might be planning to combine several Ramsey circuit kit boards in a single enclosure. Use of the inexpensive and attractive Ramsey case and knob set will give your unit that nice finished look and increase its resale value. These sturdy black instrument cases are supplied with printed overlayes on front and rear panels, knobs, rubber feet and mounting screws.

OTHER ENCLOSURE RECOMMENDATIONS:

While we believe that the Ramsey enclosure and knob option is a fine value for finishing off your Ramsey receiver or transmitter, we are happy to give you a couple of additional suggestions and our reasons for them. If your first goal is economy and rugged portability, you will find that the circuit board can be mounted nicely in a standard VHS videotape storage box, which also gives room for storing cables, a small homemade keyer, etc. The controls are easily mounted at one end of such a box. It may be necessary to cut away the molded posts which secure the tape itself. These storage boxes come in several styles, so pick one which truly looks practical as a project enclosure. To accomplish RF shielding, the most economical metal enclosure nicely suited for Ramsey amateur kit board is Radio Shack No. 270-253A. This metal utility cabinet can accommodate both a receiver and transmitter board, plus speaker, with room for various refinements you might like to add.

NOTE ON CHOOSING, ORDERING CRYSTALS:

When ordering crystals for Ramsey QRP transmitters, specify 32 picofarad load capacitance, parallel resonance, HC-6/U or HC-18/U holder, although virtually any crystal will work. The back of Ham magazines have ads for many different crystal suppliers (one source is JAN Crystals, 1-800-JAN-XTAL), any of whom are excellent. A variety of crystal styles may be used, but do not expect to get satisfactory output and keying from surplus crystals in the old WW-II, FT-243 holders which may have been opened and modified over the years.

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