[TenTec] TenTec Wiki - Model 253 tuner mod

[CSM(r) Gary Huber]

Alan, please add the following mod for the Model 253;

I recently completed a band decoding interface for the TenTec model 253
Automatic Antenna Coupler. The 253 requires a voltage of +10 to +14 VDC at
3 ma on one of seven pins to select the preset tuning information for up to
seven memories on each of four switch positions (28 memories). Originally
the voltage and pin selection was provided by the TenTec transceiver (band information), but
the OMNI-VII does not.

I used DXLab Commander to provide BCD via the computer parallel port to the
(solder pads ABCD) UM BCD-10, the band is decoded (J1 1-9) which then pulls
down pin 2 of the selected (band) 8L01 DIP Relay, which upon contact closure
outputs +12 VDC on pin 14 of the relay to one of seven Band Select pins on the #86027-26
to the 15 pin Molex® on the rear panel of the model 253 tuner. Pins 6 and 8
of the 8L01 DIP Relay are at +12 VDC supplied by +VR of BCD-10. The UM
BCD-10 receives +12 VDC from the OMNI-VII Power Supply.

references:
Model 253 Operators Manual pages v, 2-4, 2-5
8L01-DIP-Relay-PDF page 27 (http://www.cotorelay.com/8L.pdf )
http://www.unifiedmicro.com/decoder.html (bcd1.jpg)
http://www.dxlabsuite.com/commander/Help/index.htm



I’ve forgotten how to submit the info directly, thank you for your assistance.

Best regards,

CSM(r) Gary Huber - AB9M
9679 Heron Bay Rd
Bloomington, IL 61705
(309-662-0604)
www.csm-gh.com
glhuber at msn.com
gary.huber at us.army.mil