Tony,
I have bit of? history with problems of getting people to properly "tune" in an SSB signal!
From 1981 to about 2000 I operated the HF radios in a USAF C-141-A/B & C-17B? aircraft? and later (2009-2018)? the HF radios in the Boeing 737-800/900 ETOPS (overwater)? aircraft!.?
The C-141 was equipped with Collins 618T HF radios that operated from 2.000 to 29.999 MHz (USB only) and the Boeing aircraft were equipped with (among others ) the Collins HFS-900 HF radios. (also 2.000 - 29.999 MHz USB-only )?
?
They only "tuned" 1kHz steps and only worked on USB .....LSB was available but not needed because "no one" uses LSB in Aviation/Marine/Military/commercial service,? so it is not provided for selection on the control head.
[Actually the C-17B was equipped with a Collins HF (ARC-190 I think) that would "tune" in 100Hz steps and also had cockpit selectable LSB (WOOHOO!!) ]
All those years (aside from the hassle of getting people on 75 and 40 to actually talk to me on USB ......"What're you doing on the "WRONG" sideband???" )? I had one heck of a time when someone was using an older analog radio getting them to "tune" me in. (there's only one "frequency" where an SSB signal sounds "right"......I can probably tell + or minus about 20-30Hz "off"t)? I routinely had people 50-100Hz off that couldn't or wouldn't try to get closer!!?
It was sometimes a little frustrating!
73/Rick
