[Amps] ALPHA 87A Fault 24

Dick Green WC1M wc1m at msn.com
Sun Oct 16 12:12:54 EDT 2005


Fault 24 indicates that one of three internal voltages is too low -- high
voltage, 0/15V or -109V. I think the most likely cause for intermitent fault
24 would be the main supply voltage sometimes dipping below the transformer
tap setting (240V, 220V or 200V). 

First thing to do is check the mains voltage at the remote location. If the
power is fluctuating in a narrow range between two of the tap settings,
moving to the next lower tap should be OK. If it fluctuates over a wide
range, you'll have to get the power company to fix it.

A possible, but less likely, cause is an intermittent problem with the HV or
LV supply board. High voltage comes off the HV board, 0/15V comes off the LV
board and I think -109V comes off the LV board.

73, Dick WC1M 

> -----Original Message-----
> From: Glenn Christopherson [mailto:christo at airenet.com] 
> Sent: Saturday, October 15, 2005 1:48 PM
> To: Amps at contesting.com
> Subject: [Amps] ALPHA 87A Fault 24
> 
> Just joined this group; interesting discussions.
> 
> Can anyone tell me what a fault 24 actually is?
> I occasonally get this fault which shuts the amp down.
> It can happen anytime after the power is turned on.
> I do have the operating manual but it is not very clear on this topic.
> I operate the station over a 12 mile 2.4 gig link.
> 
> 73- Glenn
> VE6GC
> 
> 
> 
> 


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