Poor regulation is a common failure mode with Astron linear power supplies. The problem is equally likely to be either in the power supply section or in the regulator section.
There's an excellent troubleshooting and repair procedure here: http://www.repeater-builder.com/astron/astron-repair/astron-repair.html 73 Frank W3LPL ----- Original Message ----- From: "James Walker" <jimmy.wal...@outlook.com> To: donw...@embarqmail.com Cc: donov...@starpower.net, elecraft@mailman.qth.net Sent: Monday, February 25, 2019 7:35:49 PM Subject: Re: [Elecraft] K3/100 Voltage Drop when transmitting Thanks Don. I’m sure the problem is with with the Astron as you suggest. I’ll try your suggestions when I’m back at home in “shop mode,” Jimmy > On Feb 25, 2019, at 2:30 PM, Don Wilhelm <donw...@embarqmail.com> wrote: > > Jimmy, > > Astron power supplies have a nasty habit of having loose wiring terminals. > They use only pressure to hold the ring terminals on the inside to the > terminal bolts. > If you can detect even a slight rotation of the bolt when tightening > terminals on the outside, remove the covers and tighten those bolts from the > inside. > > The other problem is improperly assembled APP connectors. If you look > straight into the end of the connector, if you can see the tip of 2 blades in > either side, give the contact blade an extra push from the wire side until > the contact blade locks over the locking tab. > That is also a cause of APP connectors which tend to pull out with very > little tension. > > 73, > Don W3FPR > > On 2/25/2019 2:12 PM, James Walker wrote: >> I have a K3 that behaves similarly to what Mike described. I switched from >> an Astron 25 amp (15 years or more old) power supply to a switching power >> supply. Problem solved. One would think the problem was my Astron power >> supply, but I don’t see any such power drop when I use my Astron with other >> 100 watt rigs. Very strange. >> Jimmy Walker, WA4ILO >> Macon, GA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
