[AMPS] Grid block keying of SB200 for QSK???
Mon, 5 Feb 2001 09:00:21 -0500
Thinking about this a bit more,
What if I just unground the 2 x T-160L grids
to key. I have a few spare 500V MOSFETs.
| From: Bob Duckworth <firstname.lastname@example.org>
| To: amps <email@example.com>
| Subject: [AMPS] Grid block keying of SB200 for QSK???
| Date: Monday, February 05, 2001 8:31 AM
| Has anyone tried grid block keying of SB200?
| No manual and wanted to ask a couple of questions before
| pulling it out of the cabinet.
| I have a Heath HW-16. This is a low power transmitter and receiver
| built into one cabinet. It's full QSK and works like this.
| Receiver has a 6EW6 pentode as RF amp for it's first stage.
| Grid one of this tube is connected to tank side of the 75W
| output tubes DC blocking capacitor via a 10pf cap.
| QSK keying is accomplished via grid block of all transmitter stages
| with -90V.
| I'm thinking that by connecting the 6EW6 RF amp to the SB200 DC blocking
| on the tank side that I can key the SB200 along with the other
| stages. The RF and IF amp stages of the receiver are also rebiased with
| keying and I can adjust this to reduce gain further to compensate for the
| What say?
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