EMRFD Message Archive 358

Message	Date	From	Subject
358	2007-01-18 21:57:06	Monty N5ESE	T/R Switch For QRP Separates
I've experimented with what I think is a new design for a broadband QRP T/R switch, specifically targeted at QRP "separates" (i.e., separate transmitter and receiver). If you've ever built a "separate" and then scratched your head about how to actually *use* it, this one's for you: http://www.dit-dididit-dit.com/tr_switch.htm 72, monty N5ESE --- Important Message from Mom - PLAY NICE! Monty Northrup, N5ESE (ex-N5FC) Austin, Texas e-mail: n5ese@io.com web page (ham): http://www.dit-dididit-dit.com web page (home): http://www.io.com/~maddog ______ _ _/ \_/ \ /\/ _ \_ \
360	2007-01-19 07:55:40	Bill Noyce	Re: T/R Switch For QRP Separates
Monty - It's hard to be sure from the photos, but it looks as if the Rx antenna is connected to the Keynot line (and thus through two series gate-drain capacitors to the Tx antenna).  Feel free to tell me there's a cut on the board I can't see...     -- Bill, AB1AV On 1/19/07, Monty N5ESE <n5ese@io.com> wrote: I've experimented with what I think is a new design for a broadband QRP T/R switch, specifically targeted at QRP "separates" (i.e., separate transmitter and receiver). If you've ever built a "separate" and then scratched your head about how to actually *use* it, this one's for you: http://www.dit-dididit-dit.com/tr_switch.htm 72, monty N5ESE --- Important Message from Mom - PLAY NICE! Monty Northrup, N5ESE (ex-N5FC) Austin, Texas e-mail: n5ese@io.com web page (ham): http://www.dit-dididit-dit.com web page (home): http://www.io.com/~maddog ______ _ _/ \_/ \ /\/ _ \_ \
361	2007-01-19 22:36:01	Monty N5ESE	Re: T/R Switch For QRP Separates
Bill: Pretty sure that is NOT the case.  But it's quite possible that the pictures were taken before some mod was made.  I notice, for example, a resistor that's on the pc board picture, does not show on the picture of the integrated assembly.  I probably should update the images... Thanks for the heads up... it's in the queue... Trust no one (least of all, me ;-) 73, monty  N5ESE At 09:50 AM 1/19/2007, Bill Noyce wrote: Monty - It's hard to be sure from the photos, but it looks as if the Rx antenna is connected to the Keynot line (and thus through two series gate-drain capacitors to the Tx antenna).  Feel free to tell me there's a cut on the board I can't see...     -- Bill, AB1AV On 1/19/07, Monty N5ESE <n5ese@io.com> wrote: I've experimented with what I think is a new design for a broadband QRP T/R switch, specifically targeted at QRP "separates" (i.e., separate transmitter and receiver). If you've ever built a "separate" and then scratched your head about how to actually *use* it, this one's for you: http://www.dit-dididit-dit.com/tr_switch.htm 72, monty N5ESE --- Important Message from Mom - PLAY NICE! Monty Northrup, N5ESE (ex-N5FC) Austin, Texas e-mail: n5ese@io.com web page (ham): http://www.dit-dididit-dit.com web page (home): http://www.io.com/~maddog ______ _ _/ \_/ \ /\/ _ \_ \