[Skimmertalk] RP-16 front end tenderness

[Dai NAGAKURA]

Last month, I missed connection of two RPs,
I directry applied 10W from RP-14 tranceiver to RP-10 
via 14:1 transformer.  but fortunately RP-10 does not die.

How voltage evoked on RP-10 input ?

Dai / JF2IWL




On Thu, 11 Jul 2019 17:00:27 -0700
"Bob Wilson, N6TV" <n6tv at arrl.net> wrote:

> On Thu, Jul 11, 2019 at 4:48 PM Jeffrey Pawlan <jpawlan at pawlan.com> wrote:
> 
> > The version 1 schematic that Bob sent me says +/-  1v max.
> >
> 
> It also says input impedance (Rin) is 1 Meg Ohm, which is copied from the
> old RP schematic, and clearly no longer applies.
> 
> However if that 1:4 transformer is stepping up the RF voltage by a factor
> for 4, and the ADC chip can't handle more than 4V RF input, them maybe the
> 1V number is correct.  What's typical for a 16 bit ADC sampling RF?
> 
> The old RP-14 schematic said 30V max, but that was in it's factory
> configuration with large input resistors, not a radio with the impedance
> pad bypassed.  It then says 30 ma Max on the amplifier and filter, no
> longer present in the RP-16 schematic.
> 
> I was trying to evaluate the ratings of all the components in the input
> chain, one by one, as I have already done for the transformers.  1V seems
> quite low for those.
> 
> 73,
> Bob, N6TV

-- 
Dai NAGAKURA <ndai at cameo.plala.or.jp>