I'm not finding the part number for U1. I do not see it as suspect for a RX
sensitivity issue, since the documentation says it is an active mixer
circuit used in transmit mode. If the T/R mode switching diodes (D7, 8, 9,
10, 29, 30) are working U1 and Q1 cannot have much effect on the receive
function.
The 20 dB attenuator (R10, 11) is switched in/out with relay K1. Does the
RX sensitivity get even worse when you switch the attenuator on? I suspect
electromechanical components first. Such as connectors, switches and relays.
DE N6KB
On Wed, Sep 12, 2018 at 6:37 AM, L D Ritta <vk5abc@adam.com.au> wrote:
>
> Hello All
>
> Anyone know what u1 ic is on the omni 6 front end board 81593 as I could
> not find a listing, help.
> Did ten tec ever release a parts list for the 563 omni 6
> I have done a complete reset, but the receiver is pretty deaf
>
> 73's Lee
>
>
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