Since I'm relatively unfamiliar with the characteristics of a vintage Henry 3KA choke input power supply, perhaps someone would comment on a question that has arisen regarding what appears to be too
Would place money the filter choke has shorted turns. This happened to me with a broadcast transmitter years ago. - Jim Wb6BLD _______________________________________________ Amps mailing list Amps@c
Ron, Check for open bleeder resistors. 73, Tony W4ZT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Choke input filter type power supplies require a quite a bit of bleeder current to prevent voltage soaring like you describe. You can find more information about this in your handbook. I suggest you
My earlier comment about a choke with shorted turns was assuming that the supply was under load at the time of the voltage measurement. K5GW makes a very relevant comment in that regardless of shorte
Amen, Gerald.... Most of the Henry power supplies I have owned/seen over the years use c. 80,000 ohms total bleeder resistance, usually 4-each, 20,000 ohm 100 watt units. (((73))) Phil, K5PC _______
Hi Ron, My 3K-A runs about 3900 to 4000V unloaded in the SSB tap, and my line voltage is about the same as yours (high 240s). Under load, it drops to about 3700 - 3800. The bleeder resistors in there
Thanks fellows for the on target comments re: the errant Henry 3KA. Removed the OEM HV 10Hy choke and temporarily installed an 8Hy swinging choke I had lying around. That did the trick. Voltage was b
Using an oscilloscope, take a look at the transient DC regulation when using a swinging choke -- -- and you will find that you were tricked. The reason that fixed chokes are used in resonant choke fi
If the voltage regulation is satisfactory and the hum level is acceptable then I would go on to other things and consider the job finished. - JimT _______________________________________________ Amp
Rich, What's the difference between a swinging choke and a non-swinging choke? VE3YN _________________________________________________________________ Take charge with a pop-up guard built on patente
A swinging- choke reduces its inductance as current increases. A (non-swinging) / fixed-choke has semi-constant inductance as current increases or decreases. Thus, a fixed choke is usually chosen for
R.Measures escribió: Swinging choke has the air gap. Best regards Guillermo - LU8EYW. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest
If anyone has one of these 20K ohm 100 W bleeders spare to their needs or could suggest a source, I could use one to replace one that is damaged in my 2K-3. Thanks and 73, Gerald W5BA _______________