I'll finsh the band swith project. I would like to share some experience
about the band switch.
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 to
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@sm0nor.com>
To: "Amps reflector" <amps@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@sm0nor.com
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