Simple Souelch

As anyone who has monitored a receiver for any length of time knows, a squelch is worth its weight in gold. Especially mobile, nothing can seem more tiring than constant receiver noise.

A simple squelch arrangement can be added to most small transceivers, with minimum effort, to alleviate the problem. Two diodes and a few resistors are all that is needed to make this effective squelch.

Squelch Circuit
Fig. 1. Simple squelch ckcuit. Install before final audio amplifier.

The squelch circuit can be inserted between the last audio stage of the receiver and the final audio amplifier. The squelch level is set by varying the IK pot. Power is most easily obtained from a 9V transistor battery.


Frankly, no. Neither was it easy to learn how to read without two things: Proper Instruction, and practice. CODEMASTER tapes, proven In over five years of sales of thousands of tapes ail over the world, give you that essential instruction. No other teaching system offers you a more proven method, more accurate sending, more complete guidance. Select your CODEMASTER tapes below!

CM-1: For the beginner. A com piece course of instruction is on the tape. Practice material at 5. 7. 9 WPM. Prepares you for Novice exam. I ncludes code groups and punctuation.

ClVl-1%: An intermediate tape, es pecially for General Class exam study. No instruction; just practice. 'A hr 11 WPM; 1 hr 14 WPM; V2 hr at 17 WPM. Includes coded groups and straight text.

CM-2: For Extra-Class license study. Mostly straight text, some code groups. 1 hour at 20 WPM, '/, hour each at 25 and 30 WPM. For real QRQ, play this tape at twice speed!

CODEMASTER tapes are 2-track monaural; available in two styles; 7 inch reel (3% IPS) and cassette. Be sure to specify both the program (CM 1, etc) and the style ( reel or cassette). Any tape, $6.95 postpaid USA 4th class. Any two tapes, S 13.00; all three, $17.00 PPD. For air shipment in USA add 50 4. per cassette or 80si per reel. Immediate delivery. Mastercharge and Bankamericard honored; give us your account number. CODEMASTER tapes are made only by Pickering Radio Company, P O Box 29A, Portsmouth, Rl 02871. See your dealer or order .direct. Satisfaction guaranteed.._

+1 0


  • Graham
    How to make simple squelch circuit?
    1 year ago

Post a comment