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From the Ten Tec Reflector March 5, 1997
Ten-Tec currently manufactures three (four, including the limited Titan Gold) QSK-capable linear amplifiers. There has been some confusion over what will and will not key a QSK linear, as QSK. Though this sounds basic, I'd like to point out that *any* transceiver will work with our linear amplifiers in "PTT" (non-QSK) CW mode. This is how you can determine what will or will not work with our amps, if you want to run full break-in CW.
Our own transceivers use a QSK keying loop. We use a jumper across the TX OUT and TX EN jacks on the back of our more recent rigs to close the QSK keying loop, when not keying a linear amplifier. Hooking TX OUT to IN and TX EN to OUT on the linear completes the QSK loop for QSK keying of an amplifier. Some of our older transceivers (Corsair I comes to mind) did not have the QSK keying loop as a feature but can be modified for full break-in amp keying.
The Japanese transceivers are a little more tricky. Yaesu figured out recently that the QSK keying loop is a desirable attribute and has it present in the FT1000D, FT1000MP, FT900 and FT990 transceivers. Accessible via one of the DIN connectors on the back of the transceiver. These rigs will run full break-in with our amps. Neither Icom or Kenwood uses a QSK keying loop in their transceivers and cannot directly key a QSK amp in QSK mode.
There is an option though: You'll note I said that they cannot "directly" key our linears in QSK mode. The way around this is to plug your handy electronic keyer into the IN jack on the amplifier, run a line from OUT to the KEY IN jack on your transceiver and voila, you're running QSK CW. The QSK performance will be slightly degraded but still very useable. This can be done with any transceiver, even a QSK-capable one. The key point is that if you own a rig that has no QSK keying loop, you will be unable to key a linear full break-in with the rig's internal keyer or with any device plugged directly into the key input on the transceiver. You could still use the linear in standard "PTT" mode for CW.
73, Scott Robbins, W4PA Ten-Tec, Inc.
From the Ten-Tec Reflector October 19, 2004
GIGAVAC http://www.gigavac.com/products/relays/ham has introduced a line of "affordable" vacuum relays for amateur radio applications. The G41C HAM is a $75 replacement for the very expensive KiloVac K41C used in later TT amps, and the G41C HAM replaces the RJ-1A/HC-1A series relays used in earlier TT amps. These relays are available only to hams and restrictions apply … be sure read the fine print at the bottom of their main HAM page.
73, Dave, K1FK
Fort Kent, ME