I had the great pleasure of working Hans, PA2MT last night, on 80M, who was in a caravan in the Low Lands ( de Lage Landen ). He was using a PRC320 Clansman and there was some noticeable chirp but you know how we love a little chirp on this site as it adds true “character” to the signal.
Hans also reports that he was using a leg-mounted key 🙂 Way to go, Hans, however, this makes it impossible to TOF ( try other foot ) as QLF members oft tell each other to do! 🙂
I had worked Hans before; previously he was operating a SEG-15D transceiver, these originated in Eastern Germany where they were manufactured for the Marine/Military markets.
Leaving aside the subject of drift in free-running VFOs (pre PLL & TCOs ) one regular feature of old CW transmitters, particularly where they were simply high-power oscillators, was the chirp you got as the frequency dipped on key-down whilst the HT re-stabilized.
In an effort to simulate this an audio keyer is being prototyped to bring back those old days. The video shows the first hack ( 20 minutes today ) . The sound is terrible as I have not added low pass filtering to the square wave output and it is playing on a piezo sounder. It is also dual-tone (selectable by design).
The next step is to change the chirp algorithm to natural log as this better mimics the capacitive recovery effect on old HT keyed circuits.
Update – some drift on this one, a different chirp and amplifier stage was added (3rd-order RC LPF too ).
I remember (badly) a discussion some 35 years ago with an aged “G” who remembered a system of codification of transmission style in punched cards at Bletchley during the war. He said that they codified “fists” with certain criteria on punched cards and the you could see if a “newly” identified station was an old operator by inserting rods matching the fist. So you could see if Joe Blogs who used to be a radio op on ship X has moved to ship Y or an operator at Moscow airport was now somewhere else…..