[Amps] New Amplifier

[Joe]

I am just curious on how do the broadcast industry protect these things.

I toured a local FM Broadcast station last fall, after they Up-Graded 
their 16Kw OUTPUT FM transmitter from a tube type transmitter that was 6 
feet tall, 2 feet deep, and close to 16 feet wide. Ran a 4CX 15000 as a 
final.

Now the transmitter same output and all, but the foot print is a unit 
that is also 6 feet tall, and again about 2 feet deep. but only 3 feet 
wide. And it actually could have been made smaller when opened it had a 
LOT of empty space inside!

And here is something that MUST keep transmitting 100% duty cycle 24/7 
or they loose big money.

I have zero knowledge of what the finals are that generates 16+ KW 
OUTPUT on the FM broadcast band.

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/10/2017 4:31 PM, Jeff AC0C wrote:
> This is the quandary of the solid state amp.  The part can be blasted 
> in such a small time that there is a premium on the speed and 
> thresholds of the protection circuitry - too little or too late and, 
> well, it's part swapping time.  Solid state is reliable if the limits 
> are not exceeded and that means even for what can be amazingly small 
> periods of time.  A tube by comparison can generally be abused for a 
> relatively long period of time and not suffer damage which is one of 
> the reasons that I think tubes stick around - they are like that 350 
> chev - it's not the latest and greatest but it's known, it's rugged 
> and you can fix it if it breaks.
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> -----Original Message----- From: Bill Turner
> Sent: Monday, April 10, 2017 4:23 PM
> To: Amps group
> Subject: Re: [Amps] New Amplifier
>
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Mon, 10 Apr 2017 16:17:13 +0000 (UTC), Catherine wrote:
>
>>
>> I've lost track of the number of times I've had to replace the IRF510 
>> MOSFETs in my HFPacker 35 watt amp.  This is a good little amp, but 
>> it eats IRF510 transistors for breakfast. It is Class A, with two 
>> devices in parallel.
>
> REPLY:
>
> Did you miss where I said "when not abused"?
>
> I'm sure you are not personally abusing them, but something in the
> environment is and they are clearly not being properly protected.
>
> When you handle them, do you have an anti-static mat and wear a ground
> wrist strap?
>
> 73, Bill W6WRT
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