2020-12-08 Weekly SCHH Ham Club This and That

2020-12-08 Weekly SCHH Ham Club This and That

Items of Interest:  

What is the best audio frequency to listen to CW for most people

The recognition of telegraphy masked by noise at 40 and 80 signs/min telegraphy speed was studied in 10 normal-hearing subjects at different sound pressure levels (25-85 dB SPL in steps of 5 dB) as well as at different test frequencies (2000, 1000, 800, 630, 500 and 250 Hz). The ability to recognize the signs varied with varying SPL. Recognition for most of the subjects was best at an SPL close to 70 dB. All subjects improved their recognition as the frequency was lowered to 500 Hz, some even at 250 Hz. These facts should be taken into consideration when training telegraphy operators as well as in the construction of radio receivers to permit listening at low frequencies. Furthermore, the critical ratio was calculated at the different test frequencies.Humor:


Details of the 2021 meetings to be announced soon.

Wednesday Nets (8 PM) operates from KK4ONF/Jasper repeater, 147.060+ and Echolink node: KE4HAM-R

Sunday NET (8 PM) operates on 147.550 MHz simplex and Echolink node: 

Other operating:

Daily  —   DX spotting and open chat 24/7 on 147.550 MHz simplex and the Jasper Repeater, 147.060+ (no Echolink).



SCHH Amateur Radio Club VP