[Amps] Revamping a really ugly amp

[Roger]

Rex Lint wrote:
> Good point:  I hadn't thought of that.  It's probably like a voltage
> divider.  So the relay should be able to isolate (almost) 4k volts (at least
> the higher bands).  So looks like vacuum relays on the higher bands,
>   
I had been dwelling on that point for a while. "I think" which means I 
don't really know, that if the relay has a high enough breakdown 
voltage,  current handling capability, AND is constructed of a material 
that will withstand the RF it should work.  Aren't there systems  out 
there that ground out the unused portions of the tank circuit and even 
use different coils for 160, 75, and even 40?

Just a thought.

73

Roger (K8RI)
> anyway...  
>
>       -Rex-
>  
>      K1HI
>        Rex Lint
>        Merrimack, NH 
> -----Original Message-----
> From: Radio WC6W [mailto:wc6w_amps at yahoo.com] 
> Sent: Saturday, March 13, 2010 2:46 PM
> To: Rex Lint; amps at contesting.com
> Subject: Re: [Amps] Revamping a really ugly amp
>
> Hi Rex,
>   The voltage will be rather high on the open upper band relays if you are
> running on the lowest frequency.
>
> 73 & Good morning,
>   Marv WC6W
>
> http://wc6w.50webs.com/
>
> --- On Sat, 3/13/10, Rex Lint <rex at lint.mv.com> wrote:
>
> <snip>
>
>   
>> I wonder if anyone uses relays instead of a rotary switch
>> to select the
>> desired taps?  What are the parameters I need to
>> consider in trying this?
>> In my thinking, I'll just be switching the output side of
>> the inductor, and
>> the impedance at this point (when tuned) should be about 50
>> ohms, so the
>> voltage isn't that high (350 V.?),  and the current
>> would be about 6 amps.
>>     
>
> <snip>
>
>   
>> Thoughts?
>>
>>     -Rex-
>>
>>      Rex Lint, Consultant
>>      26 Brek Drive
>>      Merrimack, NH 03054
>>      PH:   
>> 603-860-7651    
>>     
>
>
>
>       
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