On Apr 30, 3:10*pm, "Sanjaya" wrote:

- I'm getting a KA2100 .

Nice choice in a very good 'portable' AM/FM Shortwave Radio.
Same Radio as the Redsun RP2100
[Kaito KA2100 & CCRadio SW]

- Has anyone installed an external SW antenna for it?

Usually use a "PAL" to "F" Connector Adapter with RG-6
Quad-Shield {TV Type} Coax Cable.
RadioShack Catalog # 278-265 = http://tinyurl.com/bcbfw

-Or- a short So-239 Plug to PAL Connector 'adapter' Cable*
http://www.universal-radio.com/catal...table/1052.jpg
* Universal-Radio.Com Item # 1052

ABOUT - The PAL Connector plus PAL-to-F Adapters
and a lot more . . .
http://groups.google.com/group/rec.r...1f34e5bbcaecb8

- I'm wondering how much signal it can take...

I use the same Shortwave Radio Listening (SWL) Antennas
with the Redsun RP2100 [Kaito KA2100 & CCRadio SW]
as i do with the Grundig Satellit 800-M and Eton E1 Radios
and the Icom IC-R75 and Kenwood R-5000 Receivers.

The Redsun RP2100 [Kaito KA2100 & CCRadio SW] has
a very useful, effective and fuctional RF Gain Control :
Just Use It As Needed.

- and the impedance of the PAL connection

The Issue is not so much the Impedance of the type of
Connector as the type of Coax Cable being used with
that Connector. The 25~100 Feet of Coax Cable is
going to have a greater impact on the Impedance that
the Radio's Antenna Input 'sees'; then any 2" Connector.

The "F" and PAL Connectors are mainly used with
RG-59 and RG-6 Coax Cable so 'figure' 75 Ohms
http://en.wikipedia.org/wiki/RG-59
http://en.wikipedia.org/wiki/RG-6

So 'consider' The External Shortwave Antenna Input
to be Low Impedance "LO-Z" : 40 Ohms ~ 120 Ohms

-vice- High Impedance "HI-Z" 300 Ohms ~ 800+ Ohms
Designed for the Twin Terminals of most Radios.

- (I have an F to PAL adapter, F connector coax
- and will get a balun if needed).

Since most of the time a Coax Cable will be being
used with the PAL Connector pluged into the Radio :
The -if- a Long Wire {Random Wire} Antenna is being
used a 9:1 Matching Transformer should be used
between the Antenna and Coax Cable.

A Dipole or Loop Antenna 'connected' to the Coax
Cable would not be required -but- a 4:1 Matching
Transformer could also be used between these types
of Balance Antennas and Coax Cable.


- Sanjaya,


hope this helps - iane ~ RHF {pomkia}