I have had no luck getting hardware ALC to work?

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  • Updated 2 years ago
I can not seem to get the hardware ALC working on my flex 6500. Heck I am not even sure how it is supposed to work. I am reluctant to stop using it as I dont want to damage my al 80 b. Could it be that the amp is not sending an alc signal to the flex? I do have DDLutil but find that under my current operating system (windows 10) some of the functions get strange so I have opted not to use it as a way of limiting the output of the flex. Any help would be useful to this perplexed and frustrated newbie.
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Tony C kc2dis

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  • all of the above

Posted 2 years ago

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Dudley - WA5QPZ

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Tony,

You do know that you have one of the most indestructible amps currently made?   ALC really is not needed for that amp,  (left over from the old Swan and Galaxy days when there was no drive control)   as with most amps if tuned correctly ..   And if you look in the Radio menu  => Radio Settings there is a "Max Power"  setting that will limit the output of the radio to what ever setting you put there.   So set the max power to 65 watts (be sure to go by the manufacturer's max input recommendations)  and properly tune the amp and it should give you many hours of QRO enjoyment.  

Dudley
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Jerry W4UK

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Hardware ALC would be extremely useful if your antenna feed line or one of its connectors should ever become intermittent. I understand some of the modern amps have protection built in and therefore might never need it, but I once had an AL1200 actually explode some of the output components because of a flakey PL239. The 1200 would have protected itself by cutting  back on the drive, but I thought it  "really is not needed for that amp", and hadn't bothered to connect it.

Don't risk your amp - use the ALC.

Jerry W4UK


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Tony C kc2dis

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I agree and would love to use it BUT  I dont know if i am hooking it up right and when i did some wonky things began going on. I understand that you connect an RCA jack from the back of the radio to the amp.. but that seems to be the extent of my sucess with this amp (al 80B). To make matters worse.. the alc set seems to have no effect when tunning the amp compounded with VERY OBSCURE tuning instructions for the amp result in one bewildered and confused newbie!
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Tony C kc2dis

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also, Dudley,, thanks for the helpful comments! Learning more and more each day.
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Bill W2PKY

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Open Settings panel go to Transmit tab and in the lower right is Hardware ALC which defaults to disabled.
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Tony C kc2dis

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Thanks I did that but does not seem to have any effect. I am not sure the amp is sending any imput. There is an alc control on the back (large pot) I dont know if I have to adjust that
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Joe WD5Y

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Tony,

You do need to adjust the pot, that should set the ALC level to your specific set-point. I have an amp that I built that I installed an ALC board in as well. The ALC board on mine had the pot also. I set mine to start at 50 watts from the rig. I set the flex output at 50 and of course checked the ALC box in the flex setup to allow ALC function and installed cable to flex. Adjust the pot while speaking into the mic until you see the ALC meter register, depending on the level of the pot setting will determine output. You may need more output before ALC cut-back, your choice. The pot is probably set very low at this time. Of course this was performed into a dummy load. I'm sorry for the details, long story short is the pot will need to be adjusted. Also, the pot should be noted in your manual, it adjusts feed-back to the flex.


73's

Joe

WD5Y

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Joe WD5Y

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Tony,

I looked at the AL 80B manual on line and did see that there is a procedure for the ALC pot setup, I believe around page 16. Hope this helps.


73's

Joe

WD5Y


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Tony C kc2dis

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Thanks so much i will chech this out.......