My samlex power supply fan takes a lot to come on, that or it doesn't work.
----- Original Message ----- 
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, December 26, 2007 9:02 PM
Subject: Re: using TS480 with 35-amp Samlex switching power supply


> probably the fan.
> that's about all that can make any noise inside a switching power supply.
> The bigger supplies will have a fan that comes on automatically when allot
> of current is being drawn.
> 73
> Colin, V A6BKX
> ----- Original Message ----- 
> From: "T Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, December 26, 2007 6:48 PM
> Subject: using TS480 with 35-amp Samlex switching power supply
>
>
>> Hi, all.
>>
>> I have noticed something when using my TS480 with my 35-amp Samlex
> switching
>> power supply.
>>
>> When I transmit with 100 watts, in CW mode or in RTTY mode using the 
>> stock
>> mic, I notice a slight but audible hum coming from the switching power
>> supply.  The hum stops when I stop transmitting.  I had my XYL take a 
>> look
>> at the meters on the front of the supply, and they say I'm running at 
>> 13.8
>> volts, and drawing about 19 amps, which is about what I'd expect.
>>
>> And, just for the record, I'm doing this with a resonant antenna, and 
>> just
>> using the auto-tuner to be sure I have a perfect match.
>>
>> Is this slight but noticeable hum when transmitting normal?
>>
>> Thanks, and 73 from Tom Behler:  KB8TYJ
>>
>>
>>
>> -- 
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> 12/25/2007 8:04 PM
>>
>>
>