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From K3006E1@ALIJKU11.BITNET Wed Oct 20 20:36:06 PDT 1993
Organization: Johannes Kepler University Linz - Computing Center
Date: Wed, 20 Oct 1993 11:26:53 CET
From: Harald Landvoigt <K3006E1@ALIJKU11.BITNET>
Message-ID: <93293.112653K3006E1@ALIJKU11.BITNET>
Newsgroups: rec.radio.amateur.misc
Subject: standard c558 info ....
Lines: 133
======================
! STANDARD C 558 !
======================
On march 3rd, 1993, I bought the Standrad C558S dual band HT. The price was
7,600 Austrian Schilling (approx. 580 US $ including all taxes).
CTCSS is not included in the European version!!
General information
=======================
Body dimensions: 55*130*31 mm (with CBT151 battery tray)
Weight: 355g (incl. batteries and antenna)
RF output: 5W (high,12V) 2.5W (mid) 350mW (low)
Freq. range of S version: VHF 144 - 148 MHz
UHF 430 - 440 MHz
Expanding the frequency range of the C558S
===========================================
1) software expansion(RX):
I) reset the unit
II) push and hold FUNC and press 3 - V/M ENT - 3
release FUNC and press PTT
now the unit will RX 100-199 MHz (PLL lock range 100-173 MHz) AM + FM
300-500 MHz (PLL lock range 342-471 MHz) FM
800-999 MHz (PLL lock range 823-990 MHz) FM
with this modification the HT can _NOT_ be tuned to all frequencies in the
900MHz and 350MHz band!!!
TX remains 144-148, 430-440 MHz
smallest freq.step:
144MHz.....5kHz
350MHz.....5kHz
440MHz.....5kHz
900MHz....10kHz
2)hardware expansion(RX):
I) open the radio.....
II) locate resistor R289. its the 0 Ohm resistor on the micro-processor-
board, right of the connector for the sub-tone sql. unit.
III) remove the resistor..... :-)
IV) reset the unit
RX/TX range remains the same as above, but now you can tune to ANY frequency
in the 350 and 900 MHz band.
3) hardware modification (TX):
I) open the unit.....
II) remove the 'galactic' RF-shielding from the micro-processor board
III) locate smd-diode Q221 (its the right one of the two smd-diodes)...
IV) the type of this diode is DA115. exchanche it with a DAN202U or
just solder a normal diode(1N4148) from the left pin to the lower
right pin of Q221:
type DAN202U smd diode:
-------
| |
| -|<-|==
|| |
==|- |
|| |
| -|<-|==
| |
-------
type DA115 smd diode:
-------
| |
| -|<-|==
|| |
==|- |
| | |
| | |==
| | | |
| ------- |
| |
---|<-----
1N4148
V) reset the unit....
the TX range will be: VHF:100-199MHz (PLL lock range 115-165 MHz :-( )
UHF:400-500MHz (PLL lock range 400-482 MHz !!)
no TX in the 350 and 900MHz band
Pro's and Con's of the C558
=============================
+ one of the smallest 2m/70cm HT
+ extremly sensitive and low noise receiver(even on 900MHz)
+ very low power consumption
+ up to 200 memories with a lot of different scan modes
+ good keyboard layout (except the 1750 Hz burst tone!)
+- the rubber-duck antenna works very good in the ham-bands and 900MHz
but does not work at all outside the 2m ham-band :-(
- the worst case I have ever seen -- so don't drop the C558!!
( Radio-Shack's CB walkie talkies can't be worse )
- some intermod. problems with high gain base-antennas
( but much better than the yaesu FT530!! )
- small LC-Display
- no backlit keys
- the mic/speaker cap ... you have to see THIS yourself :-(
- press PTT and CALL/PL key to activete 1750Hz tone...
If you know some other information about the C558 please tell me....
73/Harald, OE5LEN.....
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packet: oe5len @ oe5xem.aut.eu | A U S T R I A
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