[Boatanchors] Ranger1 w/ keyer? (part-2)

[manualman at juno.com]

I agree Bob. The addition of a TR switch which involves a solid state or
SDR receiver is a non trivial exercise and definitely requires protection
considerations. This is also true if you use a solid state RF preamp
ahead of your vintage tube receiver.

Pete, wa2cwa



On Sat, 9 Mar 2024 19:47:07 -0600 Robert Nickels <ranickels at gmail.com>
writes:
> On 3/9/2024 7:27 PM, manualman at juno.com wrote:
> > If you're creative at home brewing, adding a TR Switch even on the 
> inside
> > of a Ranger cabinet, can be a doable project.
> 
> I remember some projects that did that, always seemed like a smart 
> idea 
> to me.   I like the electronic T/R switch and with boatanchor 
> receivers 
> there's no reason for concern,  but it's important to keep in mind 
> the 
> fact that it was designed to work with receiver where the input 
> structure is the grid of a vacuum tube.   As W8JI explains,  a 
> tube grid 
> will not be damaged by the energy present until the T/R switch 
> reduces 
> the voltage to a safe level.
> 
> https://www.w8ji.com/johnson_tr_switch.htm
> 
> That's likely not true for at least some solid-state or SDR receiver 
> 
> front-ends.  Additional protection circuitry might be required.
> 
> 73, Bob W9RAN