[Elecraft] K3/100 Voltage Drop when transmitting

[Buck]

There are two adjustments in my Astron 35A supply.  One on the board, 
adjusts the voltage.  Another on the meter, calibrates the meter.  I 
found my output on the terminals was almost a volt low even though the 
meter read full.

I adjusted the pot on the board and then calibrated the meter using two 
different VOMs.  Now, all is well.  Trust but verify...

Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 2/25/2019 2:44 PM, john at kk9a.com wrote:
> I suspect the problem is the power supply and Don has some good
> suggestions. I am not sure what the actual K3 power requirements are.
> FWIW, Astron's are rated for ICS, if you really want 25 amps continuous
> you need a 35 amp linear power supply.
> 
> John KK9A
> 
> 
> 
> Don Wilhelm donwilh at embarqmail.com
> M
> 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
> 
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