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ТЕМА: ALC?

ALC? 19 Дек 2020 20:20 #1

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I’m building an Ext Ctrl interface cable to use between my SunSDR2 DX and my Elecraft KPA500 amplifier. I plan to add an RCA plug on the SunSDR2 side that is connected to pin-15 (ALC) on the KPA500 side; just in case I want to use ALC. Of course, I can always choose not to plug in the ALC plug. :-)

A few questions on ALC:

1. Is ALC implemented in ExpertSDR2? I’ve seen some documentation that said it was not implemented as of update 5.

2. Will the ExpertSDR2 ALC work with the KPA500? What little documentation I’ve seen on ExpertSDR2 ALC, indicates it expects a negative going voltage in the 0..-3V range. The KPA500 uses a range of 0..-12V.

Thanks,
Sheldon, VE1GPY/VE1SL
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ALC? 19 Дек 2020 21:17 #2

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ESDR2 will not see ALC implemented. It will be available in ESDR3.

You will need to report any found adverse ALC functionality for your KPA500 to EE. Issues can then be addressed.
Последнее редактирование: 19 Дек 2020 21:19 от g0cgl.
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ALC? 19 Дек 2020 22:32 #3

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Thanks, Erik.

No point in adding the RCA plug to the Ext Ctrl interface cable for now then. I'll leave a spare wire to add the ALC at some future date.

73,
Sheldon, VE1GPY/VE1SL
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ALC? 20 Дек 2020 21:25 #4

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In all honesty ALC controlling of amp is pointless and causes more Problems to begin with

This is why a lot of AMP manufactures do not have the option for ALC to begin with

The ALC voltage is NON STANDARD and manufacture of rigs that use it vary greatly on that control voltage- which makes it hard for consistency in timing and can cause buckshot-
your better off using your radio and amp correctly, tuning, drive power and audio stages

Acom states in their Acom 2000 manual "The ALC output of the amplifier normally remains unused. In case of need of ALC for your transceiver, WHICH WE DO NOT RECOMMEND, you may contact your dealer or see the Technical Supplement"
the only reason you may wish to use it would be in situation of a low control-grid dissipation rating design in your amp or if your amp has no input protection at all.. and in that case get a new AMP because those are the types which produce a crap load of IMD products
Please do not email me and ask for help I no longer will be part of this, If I could delete /remove my profile I would do so.
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ALC? 21 Дек 2020 12:37 #5

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Hi Rick,

I don’t know that I would say ALC is pointless. I know there are combinations of transceivers and amplifiers where ALC works quite effectively. However, you’re right, there are probably many more cases where it is causes more problem than good.

My immediate interest was deciding whether to add ALC to my Ext Ctrl interface cable. The plan will be to leave it off for now.

I’ve never had or needed ALC with my Flex-5000A or Flex-3000 radios. Provided the SunSDR2 DX can hold a maximum power output without overshoots, it shouldn’t be a problem. Also, the KPA500 does a really good job of protecting itself! Does the ESDR2 ‘Device/Expert/Power Correction’ menu set the maximum power output per band overriding the Drive setting?

Thanks, and 73,
Sheldon, VE1GPY/VE1SL
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ALC? 21 Дек 2020 23:10 #6

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It doesn’t override the Drive setting, it sets what the power output level will be when Drive is at maximum, so you can limit the level. I.e. I’ll be limiting max drive to 55W soon so I avoid accidentally sending 100W into an amp I have coming.
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ALC? 22 Дек 2020 00:11 #7

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Thanks, Chris.
I've modified my KPA500 so 15W - 18W input will drive the amp to 500W. I'll set up the ESDR2 Power Correction accordingly and leave the Drive at 100%. I wonder now if I'll ever take my SunSDR2 DX portable and run it barefoot. ... Thinking with my KPA500 modification, I probably could have gotten away with a SunSDR2 PRO for the shack. :-)

73,
Sheldon, VE1GPY/VE1SL
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ALC? 23 Дек 2020 12:42 #8

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It’s always nice to have the headroom as an option.
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