J2 DC 4-pin connector
Pins
Function
A & B
+14 VDC
C & D
Ground
Power Supply Comments by Jeff
The biggest problem with that setup, and I do like the concept, was the BNC interface cable. Transworld used a crimp type connector, and it had a tendency to short out, and when that happens it will blow the PSU in short order, it blows the output FET right off of the board.
I worked for Transworld when this unit was developed. The first revision of the PSU utilized a relay that would select the voltage Mains input. That relay was to sensitive to vibration and if it did happen to throw the contacts it would blow the PSU in short order as well. The later revision of the PSU, and I do believe we recalled all of the first revision units, was an auto sensing of the mains and the PSU worked very well after that.
So your problem most likely was the Antenna connection cable.
No. |
Marked |
Meas |
ESR |
C6 |
680 uF
250WV |
681 |
0.07 |
C7 |
680 uF 250WV | 677 |
0.45 |
C15 |
3900 uF 16 VDC | 9600 |
0.03 |
C16 |
3900
uF 16 VDC |
9610 |
0.04 |
C28 |
470
uF 35 VDC |
450 |
0.47 |
C33 |
100
uF 16 VDC |
105 |
0.40 |
(R30) |
470 uF 35 VDC | 455 |
0.15 |
(R17) |
330
uF 16 VDC |
137.4 |
1.02 |
Replacement for D310050: SD1487
Substitute transistors: MRF422 or SRF3503P
This is a table top HF transceiver. Note there is no provision to tune to a frequency, the radio only has channels.
Pressing "C" then two digits sets the radio to that channel.
Pressing "F" displays the frequency of the current channel.
Fig 1 Front
It's not clear if the 1/4" jack is for a mike or speaker.
Fig 2 Label
Fig 3 Rear
It's not clear what the purpose or pinout is of the DB-9 connectors:
J3 (yel)
J4 (red)
J8 (yel)
J9 (blu)
and Moxex connector (model No.?) for 13.6 VDC power.
Fig 4 Audio Connectors
Mike 4-Pin Connector to make cable:
Mouser Part Number: 502-09CL4MX
Fair Radio Item 8817
Adapter Cable: TW100UL - U229
Fig 5 Top Inside
Fig 6 Bottom Inside
The memory coin cell battery is at 3.043 V which is like new.
Manual
TW100 Microprocessor Controlled HF SSB Transceiver Operators Manual, Publication #990139, December 1984
Got a GM Delco mobile mike from Fair Radio in the hopes it would fit one of these radios, but alas it does not fit either of them.
The connector has 5 male pins.
The OD of the black mating tube is 0.519 and it's ID is 0.437"
Connector Pin Out
Violet
Gray
Orange
Green
Ground
Vio & Gry: PTT
Harris RF 3200ET Fly Away H.F. Radio
TW7000F Flyaway HF Tranceiver
ICOM IC706 Mk II G
ICOM R7000
NRD545 Receiver
page created 29 Feb 2012.