...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@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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