[TenTec] Dual frequency receive

[Ken Brown]

> do I have to switch back and forth to listen to both.
>   
You can switch back and forth between frequencies, to listen to both 
(not simultaneously) without having two VFOs. You just need one VFO with 
two (easy to switch between) memories. This is what most transceivers 
with an A and B internal VFO have. They typically do not really have two 
VFOs.

If you truly have two VFOs, as was common with separate matching 
transmitters and receivers (such as the Drake 4 line, Heath SB series 
and Collins S-line) and some older transceivers with external accessory 
VFOs, then it is possible to have both VFOs combined into the LO port of 
the mixer and receive two frequencies (on the same band) simultaneously.

I have never operated a rig that had this feature from the factory. 
Apparently there are several rigs that have this feature without 
modification, and some of them have a control that allows variable 
relative levels of the two VFOs and therefore of the two received 
frequencies.

DE N6KB