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Re: [Amps] source for band switch

Subject: Re: [Amps] source for band switch
From: "Hsu" <>
Date: Wed, 16 Feb 2011 00:41:37 +0800
List-post: <">>
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 
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.

----- Original Message ----- 
From: "Ulf (SM0NOR)" <>
To: "Amps reflector" <>
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.

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!


Ulf (SM0NOR)

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