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Copyright © 2004 CBTricks.com
Pride DX300 CHAPTER 8
8.0 Introduction:
In this section I have information on some of the components use in the DX300.
8.1 Antenna Change Over and Preamp Relay Information:
The antenna change over relay (RL1) is a 4- pole double throw (4PDT) relay with 10 amp contacts and a 12 volt
185ohm coil. I’ve always seen an Allied Control relay here. Part number TY154 CC-CC 12VDC. The current part
number to order would be TY154 4C 12VDC with only change being the way the "C’s" are entered. Potter &
Brumfield have a similar relay with contacts rated at only 7.5 amps but it would probably work in a pinch. That
part number would be R10-E1-W4-V185.
The pre-amp relay (RL2) is usually a Potter & Brumfield. The original part number would be R10-E1-Y2-V185.
That crosses over to a NTE R16 11D3 12. It is a 2PDT type with 3 amp contacts and a 12 volt 185ohm coil.
8.2 Band Switch:
If the amp is keyed up and the band switch (S5) is turned while still keyed, the band switch is ruined for good -
the contacts will burn so badly that the entire switch will have to be replaced. The Band switch I haven’t found a
replacement.
8.3 Input Coil Information:
T3, the 9-1 (impedance) step-up input transformer "3 wires, 10 windings" “trifilar”
L5: 10 meters is 12 turns #24 shows 0.75 µH.
13 TURNS, APPROX 0.9 µH, works better on 27 MHz.
Core: 7/16" OD x 7/32" ID x 5/32" thick. Yellow/black
Probably a "-6" powdered-iron core.
L4: 15 meters is 17t. shows 1.4 µH. same core
L3: 20 meters is 23t. shows 2.4 µH same core
L2: 40 meters is 31t. on a larger core, shows 6 µH.
Core: 11/16" OD (T-68?) x 3/8" ID x 7/32" thick red,
probably "-2" powdered-iron mix.
L1: 200 µH RF choke.
8.4 Z1 Information:
8.5 Z2 Information:
If the resistors look like toast, new resistors should be
installed before you try to run it.
If the resistors look okay, and it has all 3 of them, leave
it alone. If you replace them, we recommend using a 5-
Watt rated 100-ohm carbon-film or metal-film resistor.
They will withstand more abuse than the original 2
Watt-rated parts.
DO NOT USE WIRE WOUND RESISTORS Period.
Mouser Electronics, Westgate Labs and RF Parts sell
this resistor.
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