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KA2100: Superior by Design

VERSION 1 



2008

The information below is not guaranteed to be free of errors.

1. Introduction

I highly recommend the

DE1102, DE1103, and KA2100 portables. Performance comparison

revealed the KA2100 as champion on MW, FM, and SW. Examination of each radio’s internals and

schematics helped illuminate how

Redsun Electronics achieved this feat. The KA2100, with its lack

of SSB and unrefined software, could easily end up hastily dismissed. Beneath the silver and black

exterior resides an old-school PCB and solid RF engineering. The KA2100 makes heavy usage of

mechanical controls. It is possible the

KA3100 will end up our next king of low-priced portables.

Radio RF BW Step SSB Cost Size Mem Knob NiMH

DE1102 GOOD 2 1 kHz YES $64 22 in

133 NO YES

DE1103 GOOD 2 1 kHz YES $64 31 in

268 FAIR YES

KA2100 GOOD 2 1 kHz $33 $100 229 in

30 GOOD $18

2. Design Comparison

The

MW section of each radio consists of a ferrite rod antenna followed by an RF amplifier.

The KA2100 uses

Twin-Coil technology invented by Chris Justice. Each end of the ferrite contains

a pick-up coil that feeds into a combining transformer. MW tuning in the KA2100 is done via MCU

control and is transparent to the user. Stand-alone Twin-Coil antennas cost $100.00 at C. Crane.

The

FM section of each radio is diode switch, enters a TA7358 FM front-end chip, goes into

two 10.7 MHz filters, and finishes in the tuning chip. The KA2100 has a separate FM demodulator,

the LA3335. The KA2100 alone has a tuned BPF and post-amplification uses dual tuning elements.

Radio MW Twin-Coil MW Tuned FM RF FM Tuned FM Demod

DE1102 NO NO LC SINGLE TA8132

DE1103 SOME UNITS NO BPF SINGLE TA2057

KA2100 YES YES TUNED DUAL LA3335

The

AM (and MW) section of each radio consists of a BPF, LPF, attenuator, dual JFET mixer,

BPF, single JFET mixer, two IF filters, AM/FM tuning chip, and an MCU controlled PLL, the

LC72137

(tuning both AM and FM local oscillators). The KA2100 alone has input protection diodes, RF gain

control, and five metal shielded areas on the PCB. Note the DE1102’s lower first IF of 10.700 MHz.

Radio

Diode

Protect

Gain

MHz

kHz

Tuner

Chip

Boxed

Shields

SSB

DE1102 NO NO 10.700 450 TA8132 2 YES

DE1103 NO NO 55.845 450 TA2057 3 YES

KA2100 YES YES 55.845 455 LA1260 5 NO

1 2 3

Indice de contenidos

Pagina 1 - KA2100: Superior by Design

KA2100: Superior by Design VERSION 1 2008 The information below is not guaranteed to be free of errors. 1. Introduction I highly recomm

Pagina 2 - 3. E1 versus KA2100

The audio section on the physically larger KA2100 is beefier and drives a five inch speaker. The KA2100 has separate bass and treble control knobs

Pagina 3 - 2008 Phil

5. Discussion In my opinion the KA2100 is an instant SW classic. The engineers at Redsun Electronics in China deserve a round of applause. They went

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