[Skimmertalk] Difference of RP10 14 16

[Bob Wilson, N6TV]

On Mon, Jul 15, 2019 at 8:09 PM Dai NAGAKURA <ndai at cameo.plala.or.jp> wrote:

> I have tested RP-10 and 14 , five weekdays and IARU HF 24 hours.
>

Thank you.


> To write a brief paper, I would like to know two point below.
>
> (1) RP-10 could run only 6 bands at the same time
> RP-14=8 bands , RP-16=8x2=16 bands . is it right ?
>

I'm not sure about the RP-10, I thought it was also 8 bands.  RP-14 is
definitely 8 bands, and RP-16 = 8x2 = 16, correct.


> (2) RP-10 and RP-14 need step down transformer and pre-amp Instead, RP-16
> need NOT Both.
>

Yes, RP-10 and RP-14 both need to have 14:1 impedance transformers (and
shunt jumpers moved on both inputs), and they need about a 10 dB preamp.

I am not sure if the RP-16 needs a preamp.  Maybe only on one antenna
input, just for the high bands.  But it is easily overloaded (intermod) by
nearby FM broadcast stations between 88 and 108 Mhz, and needs a lowpass
filter.  A preamp could make the problem worse.

73,
Bob, N6TV
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