[NLRS] T/R on a TR-751

[Bruce Richardson]

Ok, for sequencing on my 10GHz set-up, I always intended to build a
sequencer and put the microphone and the PTT switch on the mic at the
start of the chain.
By that I mean, the mic switch would get depressed and the sequencer
would detect this and:
1. switch the SMA relay to ON (xmit)
2. ground the xverter for xmit
3. ground the 2&8 watt amps for xmit
4. Finally pass the PTT and mic signals to the TR-751 (turning the rig
on last)

The plus to this is that the rig really is turned on last.  That's fine
in SSB.  But what about in CW mode where if I bump the key, the rig goes
into transmit???

An alternative scheme that is possible:
The TR-751 has an aux port on the back of the rig that shows "ground"
whenever the PTT is depressed OR if the rig goes into CW tranmit
(complete with break-in delay holding it in transmit on CW).  I could
run this "ground" to the sequencer and detect it and:
1. switch the SMA relay to ON
2. ground the xverter for xmit
3. ground the 2&8 watt amps for xmit

The plus to this latter scheme is simplicity but the minus is that the
IF rig really is putting out signal down the IF line to the xverter
before the xverter is switched over.  Yeah, I know, this is what I've
been doing for years but....

The reason I want to do the SMA relay first is that the LNA pre-amp is
always powered on and I want it out of line first for protection.

Will the latter scheme be ok?  What do you think of my order of switched
items?

A busy time at the FZ household with major 10GHz overhaul in progress.
73
Bruce W9FZ