[Amps] source for band switch

[Hsu]

I  notice  that he use Nylon shaft.We had use similar design in some  prototypes of HF2000DX  amplifier.
 But Nylon is not good material for RF use, in 5 prototypes , there is a band  switch arc , the arc happen between two metal  rotors.
   We think it duo to the material  of shaft problem.We have modify the design, using ceramic-metal rotor like Muti-tech's.Our amplifier 
have sold over 60 units, without similar problem again!
   This problem can sovle  in two ways: 1) replace the metal roter  ceramic-metal roter like multi-tech's.2) replace the nylon shaft to fiberglass shaft.
in my option, 2) is the best way,because the nylon shaft  without enough   rigidity  and  easy to twist  or brokeak as PA3UV/Dick mentioned.
 We'll finsh our new band switch project  in next month.
          73!Hsu

----- Original Message ----- 
From: "Ulf (SM0NOR)" <ulf at sm0nor.com>
To: "Amps reflector" <amps at contesting.com>
Sent: Tuesday, February 15, 2011 8:22 PM
Subject: [Amps] source for band switch


Hi all,

This guy is selling new band switches, allegedly used in OM3500.

http://www.qro-shop.com/

Press the English flag for English or scroll down to "schalter" and look for "Bandschalter 5000W"

The price €175. Still a lot, but cheaper than Radio Switch.

I have no interest in the business. I just wanted to share this information to other builders. I have bought a few other things from his shop earlier. So I know he is good and honest!




73's

Ulf (SM0NOR)
ulf at sm0nor.com



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