[hpsdr] ALC and power control

[Helmut Oeller]

Hi Jim,

these spikes is a major shortcoming of many legacy (analog) radios. To protect the the final transistors against damage at bad SWR the power is reduced by means of an analog regulation loop. This loop needs a certain time to react. If the same loop circuit is also used for normal output power variation its no surprize that these spikes are generated.
Don't worry. HPSDR design excludes this deficit due to another architecture.

73, DC6NY
-----Ursprüngliche Nachricht-----
Von: Hpsdr <hpsdr-bounces at lists.openhpsdr.org> Im Auftrag von Jim Sanford
Gesendet: Donnerstag, 22. November 2018 15:37
An: hpsdr at lists.openhpsdr.org
Betreff: [hpsdr] ALC and power control

***** High Performance Software Defined Radio Discussion List *****

All:

I have been reading an interesting discussion on a solid-state KW Pwr Amplifier board regarding the transmit power spike produced by so many of the commercially available radios.  (Power spike killing devices in the PA.)

This generates two questions:

1.  How does HPSDR (with Munin) control power -- does it ramp up, or start at full power and ramp down based on drive setting?  (I have never seen any spikes .)

2.  Does HPSDR (with Munin) accommodate an ALC input from an external KW amp?  I don't recall seeing anything about this online or in the various manuals, but may have missed it.  (Don't have access to manuals for a few days.)  If it does, what are the specs/limits/setup?

Happy Thanksgiving to those in the US!

Thanks & 73,

Jim

wb4gcs at amsat.org



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