[BULK] - Re: [Amps] Pin Diodes questions

[Steve Katz]

...anybody know the actual ratings of the KS1001?  I've used UM20xx and
UM70xx series PINs for years without a single failure, but know nothing
about the KS1001.  Who makes it?  -WB2WIK/6

"Success is the ability to go from failure to failure with no loss of
enthusiasm." -Winston Churchill

> -----Original Message-----
> From:	R.Measures [SMTP:r at somis.org]
> Sent:	Thursday, November 20, 2003 4:36 AM
> To:	Victor Vickers;  AMPS
> Subject:	[BULK] - Re: [Amps] Pin Diodes  questions
> 
> 
> 
> >Discussing Pin Diodes in RF amplifiers
> >
> >The problem of obtaining in my earlier post was for the Alpha 89 for a 
> >friend. I own one and a friend WW4US owns the failed unit. 
> >We were researching the problem this weekend before Crosslink opened. 
> >Since then Crosslink is shipping the needed KS1001 pin diodes.
> >
> >Please do not address some of the below suggestions about how it may be 
> >absurd. Be constructive. 
> >The suggestions have been listed as hams this weekend offered them up.
> >
> >New questions:
> >
> >*  What can one do to protect RF Amps using pin Diodes?
> 
> **  To protect PIN diodes from lightning, when finished operating, unplug 
> the feedline from the amplifier and toss it out the window on the ground. 
>  The feedline should not come within 10-ft of the house.,  [note - 
> "C"-type connectors are ideal for this because they are bayonet mount]  
> >
> >         Suggestions and Solutions to date from on the air hams: 
> >           I. Addressing static discharge  
> >                    A .   Install High value resistor across amp output
> i.e. 
> 300K
> 
> **  A 10M bleeder R on the antenna itself worked for me.
> 
> >                    B.    Provide a antenna with DC ground path. i.e.
> loop 
> antennas, dipole
> >               with coaxial stub., and high impedance choke to antenna.
> 
> **  lightning is not just DC.
> 
> >                    C.    Alpha has a gas discharge arrestor right at the
> 
> >output connector. Is this adequate and 
> >               what level of static discharge protection does this
> provide?
> >                    D.    Short coax to gnd after reconnecting to amp 
> >after being disconnected.
> >           2. High SWR       
> 
> **  keep plenty of spare PIN diodes on hand.  
>   
> >...
>  .Good luck, Victor.  
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