‰  NOW 25 WPM  ‰  TEXT IS FROM JULY 2014 QST  PAGE 36‰

GOOD BECAUSE THIS IS THE VALUE RECOMMENDED BY THE IARU INTERNATIONAL
AMATEUR RADIO UNION FOR AN S UNIT, AND RESULTS IN A METER RANGE OF 54 DB.
HOWEVER, IN ORDER TO SET THE RECEIVER UP FOR THE IARU RECOMMENDATION, WHICH
ALSO SPECIFIES P9 TO BE 73 DBM 50 5V INTO 50, THE RECEIVER MUST HAVE
SUFFICIENT GAIN TO ACHIEVE A PT OF 127 DBM 0R1 5V.  MY RECEIVER DOES NOT
HAVE THAT MUCH GAIN ON ALL BANDS, BUT THE PROBLEM CAN BE ALLEVIATED BY
CHOOSING PT TO BE A HIGHER VALUE, SUCH AS 67 DBM 100 5V.  THIS IS A COMMON
VALUE FOR S 9 IN VINTAGE RECEIVERS, INCLUDING THE COLLINS S LINE.  OR, AN
EVEN HIGHER VALUE FOR PT COULD BE CHOSEN.  TABLE 1 SHOWS THE 1981 IARU
PROPOSED RF LEVELS FOR S UNITS AT AN HF RECEIVERS 50 ANTENNA INPUT.
ALTERNATIVELY, SETTING 4 DB/S UNIT IS EASILY ACHIEVABLE, EVEN USING THE
IARU VALUE FOR P9 OF 73 DBM 50UV.  ALSO, 4 DB/S UNIT IS CLOSE TO THE
AVERAGE VALUE SEEN IN A STOCK S LINE RECEIVER.  THE 75S 3B MANUAL SUGGESTS
‰  END OF 25 WPM TEXT  ‰  QST DE W1AW  ƒ