Anyone local to him have a 3000? Might be worth trying his at another station and a known working 3000 form another station at his...
From: [email protected] [mailto:[email protected]] On Behalf Of Brian Lloyd Sent: 04 January 2012 17:23 To: [email protected] Cc: FlexRadio reflector Subject: Re: [FlexRadio] Re: Transmit spikes - continuing problem On Wed, Jan 4, 2012 at 8:11 AM, Steve - W6SDM <[email protected] <mailto:dd.maricopa.az%40gmail.com> >wrote: > ** > > > Have you tried another firewire cable? Or, better yet, have you tried a > Granite firewire cable? I can't say enough about the improved performance > from the quality of the cable and the extra shielding. > > I assume you have checked for ground loop and that you have the computer > cabinet grounded. > > Other than that, and from what has been suggested here, I am ready to > suggest sacrificing a goat at the base of your antenna mast as a possible > solution. :) > > Good luck - I am sure that the cause of the problem will surface. > OK, he has pretty much determined that it still has the problem with a dummy load, and with the radio and computer removed from the shack. That makes it pretty clear that this is NOT an RF problem. The only commonality is the mic cable. Looking at the schematics for the 5000 and 1500 (I don't have the schematic for the 3000 but it seems to work the same), the mic input on the radio is cap coupled. I must admit, I use this to good effect by putting my bias resistor directly between +5V and Mic+ in the mic connector in order to get the bias to the electret mic element. That works and I have no problems. But if one were to switch that voltage, I would definitely expect a "thump" as the +5V is switched to Mic+ due to the charging of that coupling cap. I have a 3000 that does not exhibit any problem like this as do many other people. So what is different about this setup? I keep thinking about the mic cable and mic switching. The other possibility might be the power supply momentarily losing regulation when the sudden load of the PA bias comes on. I would try switching power supplies because that is an easy thing to do. -- Brian Lloyd, WB6RQN/J79BPL 3191 Western Dr. Cameron Park, CA 95682 [email protected] <mailto:brian%40lloyd.com> +1.767.617.1365 (Dominica) +1.916.877.5067 (USA) [Non-text portions of this message have been removed] __._,_.___ Reply to <mailto:[email protected]?subject=Re%3A%20%5BFlexRadio%5D%20Re%3A%20Tra nsmit%20spikes%20-%20continuing%20problem> sender | Reply to <mailto:[email protected]?subject=Re%3A%20%5BFlexRadio%5D%20Re%3A%20 Transmit%20spikes%20-%20continuing%20problem> group | Reply <http://groups.yahoo.com/group/FlexRadio/post;_ylc=X3oDMTJxdmkzbnVpBF9TAzk3M zU5NzE0BGdycElkAzE3NDIzNTYyBGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM5MDY5BHNlYwNmd HIEc2xrA3JwbHkEc3RpbWUDMTMyNTY5Nzc4OA--?act=reply&messageNum=9069> via web post | <http://groups.yahoo.com/group/FlexRadio/post;_ylc=X3oDMTJmODQ4Z2JhBF9TAzk3M zU5NzE0BGdycElkAzE3NDIzNTYyBGdycHNwSWQDMTcwNTA2MzEwOARzZWMDZnRyBHNsawNudHBjB HN0aW1lAzEzMjU2OTc3ODg-> Start a New Topic Messages in this topic <http://groups.yahoo.com/group/FlexRadio/message/9036;_ylc=X3oDMTM1ZWMzYWhxB F9TAzk3MzU5NzE0BGdycElkAzE3NDIzNTYyBGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM5MDY5B HNlYwNmdHIEc2xrA3Z0cGMEc3RpbWUDMTMyNTY5Nzc4OAR0cGNJZAM5MDM2> (31) Recent Activity: . <http://groups.yahoo.com/group/FlexRadio/members;_ylc=X3oDMTJnYTJodTE4BF9TAz k3MzU5NzE0BGdycElkAzE3NDIzNTYyBGdycHNwSWQDMTcwNTA2MzEwOARzZWMDdnRsBHNsawN2bW JycwRzdGltZQMxMzI1Njk3Nzg4?o=6> New Members 5 <http://groups.yahoo.com/group/FlexRadio;_ylc=X3oDMTJmNnNhZ21wBF9TAzk3MzU5Nz E0BGdycElkAzE3NDIzNTYyBGdycHNwSWQDMTcwNTA2MzEwOARzZWMDdnRsBHNsawN2Z2hwBHN0aW 1lAzEzMjU2OTc3ODg-> Visit Your Group -------- Any and all comments and opinions stated here are those of the individual user and not FlexRadio Systems MARKETPLACE Stay on top of your group activity without leaving the page you're on - Get the Yahoo! 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