[VHFcontesting] 50 volt power supply

[David Olean]

Hello FET exploders
>
> I bought one of these items on Epay:
>
> https://www.ebay.com/itm/234728817137?epid=1119242095&hash=item36a6ed81f1:g:IroAAOSw5dNjRDYJ&amdata=enc%3AAQAHAAAAwBhG775IeMLhhW%2BjI5OYdz3wYCMXyaxcpHq1M6XNTAExxy9Wj1NZ1n%2F%2BSi8K%2B1e37yPpYKm1fsqYU0BKd4yi71cE9hNxaSTsDLtU6RFMkzfVYpgdDLkmA5iLAEQVj64s%2Bexa%2BkhwmMXWUMcNc0%2BvtqJL5Wc89CEsyIiO%2BHpSpH2VC6t7UdricbwWds%2FrZry4%2Bsyb9UC9bHtUaaKtfMAtwwhMuvEdH32X7Q0QgOqeZ4W9vI31jskg8CoXQHelrevc0A%3D%3D%7Ctkp%3ABk9SR8ivy-j5YA
>
> It is a Cisco Catalyst power supply
>
>
>   Cisco Catalyst 6504-E 2700W AC Power Supply PWR-2700-AC/4 AA23420
>   341-0138-02
>
> I paid under $35 for it post paid and it really does provide 50 VDC at 
> up to 53 amps when running on 240 volts AC. If you use it on 120 
> volts, it is good for about 26 amps. It has a rather quiet fan that is 
> not at all objectional, and is small and light weight.
>
> It is slightly narrower than what fits in a 19" rack, so I made two 
> ears that will now let it will bolt right in just fine.  To activate 
> the power supply you must ground one of the small pins on the power 
> plug. I attached a photo that shows how to do it. Looking at the plug, 
> there are four blade contacts on the left side and two blade terminal 
> sets on the right.  There are four rows of six pins in the middle 
> between the big terminals. Short the far left pin of row 2 to the 2nd 
> pin from the left on row #1. This will  allow the power supply to 
> operate.  The two blade terminals on the far left are 50- and the next 
> two sets just to the right of them are the +50 ones.
>
> I just thought this info could be of use to VHFers for solid state PAs.
>
> Dave K1WHS
>
>