DRAKE TR7 Service Manual

The N4YG DDS VFO and the Drake TR7OverviewThis document describes the installation of a N4YG DDS VFO into my Drake TR7 transceiver. The VFO is a terr

Figure 11: Rear of Tentec tuning knob as modified. Remove the two small screws and take off the friction fingers. Then glue the skirt to the knob b

Figure 12: This shows the rear of the escutcheon plate with the LEDs mounted. The blue wires are from the connector on the VFO board. The VFO board

In conclusionThe N4YG VFO is a reasonably priced approach to solving the PTO problems of the TR7, including stability and tuning rate. The installati

Proper operation of the VFO demands that you either use existing TR7 pushbuttons or add new ones. Not wishing to alter the existing panel or add a sub

restored later if you choose. The following photo shows the small metal wire piece that can be pulled out easily with needle nosed pliers after pulli

1/8” holes that line up with the existing holes in the panel. This piece of copper is then sandwiched between the escutcheon and panel. The slight g

Figure 4: Escutcheon mounted to panel with copper encoder mounting sheet sandwiched between escutcheon and panel.LED DetailsI chose to use all five s

Figure 5: Rear of escutcheon showing the LED mounting plate in place.Figure 6: Front of the escutcheon – plate painted satin black.Figure 7: Finish

RIT DetailsI used the existing RIT pot on the TR7 after removing the existing wires from the terminals (clip the bare ends and use a piece of heat shr

Photo 9: The coax from the VFO - the shield is soldered to the empty hole seen in the above photo.Regarding the Tx/Rx line: In the TR7, there's

The encoderThe encoder included with the VFO really is not a good fit for the TR7. I used a Honeywell 601-VCS encoder from DigiKey and that one has a