Running CW on the PSK-80 Warbler
				   By William K. Mabry, N4QA
					 29 July 2001





Method 1:

1.1a For sending CW manually, using DigiPan v1.6d, click on 'Mode', then click on 'Tune'.

1.1b For sending CW manually, using HamScope v 1.51, click on the down arrow beneath 'Mode',
     then click on 'CW' and, finally, click on 'Tune'.


1.2  Break the transmit audio line to the Warbler and insert a hand key in series with
     the 'hot' audio conductor. The common or shield conductor(s) must be continuously maintained.


1.3a If desired, use DigiPan's 'CWID' function for automating the CW CQ process.

1.3b HamScope has macros which may be used for things such as automating the CW CQ process etc.
     HamScope includes a versatile CW keyboarding feature.

1.3c Any in-line handkey must be held closed (shorting bar etc) for 1.3a or 1.3b, above.


1.4a To return to CW receive, using DigiPan, click on 'OK'.

1.4b To return to CW receive, using HamScope, click on the 'Tune' button (either one).


1.5  Route the Warbler's audio output to an 'amplified speaker' etc.
     A tunable audio filter placed between the Warbler's audio output and the input to the
     'amplified speaker' helps single out the desired received signal.
     We may also continue to route the Warbler's audio output to 'Line In'
     (OR Mic In, if  preferred (and, before or after any audio filter, as desired)) on the soundcard,
     to retain use of the panoramic display.	


1.6  Choose an operating frequency in the same manner as for PSK31.
     We might want to operate CW between 3579 and 3580 kHz to avoid QRMing PSKers.




Method 2:


Method 2 will remain, indefinitely, a thought exercise because actually implementing it would involve
significant hardware modifications to a rig which, I believe, is a classic.
So, I'll just rattle off a few thoughts about that which *could* be and, then, I'll just leave it there.
Access to the Warbler's schematic diagram is very helpful to understanding the following.

Components which *might* become unused (or re-used as mod parts):

C1, C2, C6, C7, C8, C101, C102, J2, Q1, Q2, R1, R2, R3, R4, R6, Y1, Y2... did I miss any ?

We could re-configure the oscillator section of the SA612A at U2 as a VXO for the receiver and separate it
from the VXO section of U1...the transmitter VXO. This, of course, would facilitate independent frequency 
control for transmitter and receiver and the controls could be front-panel-mounted for convenience. We would,
naturally, want the frequency range of both VXOs to operate from, say, 3579 to 3580 kHz...right ? During
receive, we would need to cut off the transmitter VXO so as not to QRM ourselves :)
It would be 'nice', though, to be able to momentarily turn on the transmit VXO during receive, for the purpose
of matching another station's transmit frequency without our having to actually transmit.

We would need to couple rf energy from the oscillator section of U1 to the base circuit of Q3.

We could manipulate the DC bias at the input pin(s) of U4-A to effect T/R switching, either
manually or via an RS-232 control line etc. Small Wonder Labs' original Warbler design uses a PC's RS-232 
RTS control line for PSK31 T/R switching.

We could insert *some* R between Q7-D and the junction of R23,R24 to allow a little 'sidetone'
(receiver audio, actually) to come through during transmit.

We could just build a new / another rig...hmmm...  :)

End rattle...

I have no connection with any above-mentioned vendor.