Seeing as I am using two of these devices in series I am good to go here. I can understand the relay closure and setting issue. My understanding was the Grid voltage dropped when keyed? Or am I thinking of something else?
I am trying 50 ms. I am not seeing any real difference in how my rig responds with the increased setting. I may try an even less aggressive setting here. On Mon, Sep 2, 2013 at 7:52 AM, Jordan Arndt <outposte...@shaw.ca> wrote: > Page 9 of the Flex5k manual discusses the keying line limitations and > shows an intermediate ckt to be used called the "Protective PTT circuit > between TX1-3 and Amplifier". The relay you use "external" to the Flex > should handle whatever voltage/current parameters are required by your rig. > If you have a -125Vdc line to be keyed, use a relay with contacts rated for > that voltage or better. A 30-50ms delay should be fine... > > 73...Jordan VE6ZT > > ----- Original Message ----- From: "Jim Barber" <audio...@q.com> > Cc: <flexradio@flex-radio.biz> > Sent: Monday, September 02, 2013 8:18 AM > Subject: Re: [Flexradio] TXOut Delay. > > > If you don't care about arcing the relay contacts or generating a burst >> of nasty, broad signal when you key up, >> then of course you'd be right. >> >> If your transceiver could handle the switch voltage/current/inductive >> spike of the amplifier relay key line, >> you'd be right again. In your case, though, since the SB-200 uses a 120V >> relay coil, I somehow doubt the F3K's >> switching transistor would tolerate that for long without the isolation >> box. Perhaps someone from Flex knows the actual spec. >> >> Not sure how "overly cautious" applies here? >> >> 73, >> Jim N7CXI >> >> On 9/2/2013 7:01 AM, Lee Mushel wrote: >> >>> Interesting thread. I suspect that the topic is simpler than people >>> might want it to be. When I started to use the Flex3000 with a rather >>> heavily used SB200 some three years ago I wondered about the possibility of >>> mixing tube and solid-state voltages and was told to "not worry about it." >>> But being a conservative person I bought a "Sunlight" isolation relay box >>> (no longer available), never adjusted anything and have never had any >>> problems. But then I've long felt that people tend to be overly cautious >>> which can lead to wanting to be "taken care of." >>> >>> 73 >>> >>> Lee K9WRU >>> ----- Original Message ----- From: "Jim Barber" <audio...@q.com> >>> Cc: <flexradio@flex-radio.biz> >>> Sent: Sunday, September 01, 2013 10:14 PM >>> Subject: Re: [Flexradio] TXOut Delay. >>> >>> >>> 50ms is probably around the minimum for an SB-200. >>>> >>>> It all depends on the relay(s). In the case of the SB-200 it's an old >>>> open-frame type, very slow. Amps advertised for "QSK" use often have vacuum >>>> relays, which can switch many times faster. >>>> >>>> If you're running SSB, keep in mind that hotswitching the antenna >>>> contacts is the major issue, but not the only one. Some amp designs (not >>>> the SB-200) have a separate relay for the tube bias, which is often >>>> buffered with a simple R/C network. The point is that you shouldn't put >>>> drive on the tube(s) before the operating bias has had time to switch from >>>> cut-off to operate. In the case of the SB-220 for example, the cutoff bias >>>> is set to a unnecessarily high voltage as a matter of convenience, which >>>> makes the situation worse. >>>> >>>> My .02, >>>> >>>> Jim N7CXI >>>> >>>> >>>> On 9/1/2013 8:22 PM, Steve Sterling wrote: >>>> >>>>> Steven-- I was kinda waiting to see what others thought, but haven't >>>>> seen any response in 24+ hours. >>>>> >>>>> I have mine set at 50ms. That's a pretty reasonable time for power >>>>> and antenna relays to pull in and get seated. >>>>> >>>>> I originally started at 100ms, but the delay was noticable-- not long, >>>>> but you could kinda tell it was there. I can't tell 50ms at all, except a >>>>> little on CW. I start getting faults in my amp with less than 20-25ms of >>>>> transmit delay on 80 and 40 meters. 20 meters I could set it at 0ms and >>>>> it >>>>> never faults. Go figure. >>>>> >>>>> Steve WA7DUH >>>>> >>>>> On 8/31/2013 7:52 AM, Steven Hess wrote: >>>>> >>>>>> I've got a SB 200 with a interface for proper keying from a modern >>>>>> rig to >>>>>> the relay installed. >>>>>> What should I set the TXOut delay for to make sure the relays are >>>>>> properly >>>>>> closed before I pass RF to the amplifier? I've got it set for 7 In the >>>>>> General Options tab of PowerSDR right now. >>>>>> >>>>>> Steven >>>>>> >>>>>> >>>>> >>>>> ______________________________**_________________ >>>>> FlexRadio Systems Mailing List >>>>> FlexRadio@flex-radio.biz >>>>> http://mail.flex-radio.biz/**mailman/listinfo/flexradio_** >>>>> flex-radio.biz<http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz> >>>>> Archives: >>>>> http://www.mail-archive.com/**flexradio%40flex-radio.biz/<http://www.mail-archive.com/flexradio%40flex-radio.biz/> >>>>> Knowledge Base: http://kc.flexradio.com/ Homepage: >>>>> http://www.flexradio.com/ >>>>> >>>>> >>>> >>>> ______________________________**_________________ >>>> FlexRadio Systems Mailing List >>>> FlexRadio@flex-radio.biz >>>> http://mail.flex-radio.biz/**mailman/listinfo/flexradio_** >>>> flex-radio.biz<http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz> >>>> Archives: >>>> http://www.mail-archive.com/**flexradio%40flex-radio.biz/<http://www.mail-archive.com/flexradio%40flex-radio.biz/> >>>> Knowledge Base: http://kc.flexradio.com/ Homepage: >>>> http://www.flexradio.com/ >>>> >>>> >>>> >>> >>> >>> >> >> ______________________________**_________________ >> FlexRadio Systems Mailing List >> FlexRadio@flex-radio.biz >> http://mail.flex-radio.biz/**mailman/listinfo/flexradio_**flex-radio.biz<http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz> >> Archives: >> http://www.mail-archive.com/**flexradio%40flex-radio.biz/<http://www.mail-archive.com/flexradio%40flex-radio.biz/> >> Knowledge Base: http://kc.flexradio.com/ Homepage: >> http://www.flexradio.com/ >> > > > ______________________________**_________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/**mailman/listinfo/flexradio_**flex-radio.biz<http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz> > Archives: > http://www.mail-archive.com/**flexradio%40flex-radio.biz/<http://www.mail-archive.com/flexradio%40flex-radio.biz/> > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ > -- ____________ Apply appropriate technology. Use what works without prejudice. Steven L Hess ARS KC6KGE DM05gd22 Google Voice 661 769 6201 +SMS openSUSE Linux 12.3 KDE Known as FlameBait and The Sock Puppet of Doom. _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
