[DSP-10] Sanity check for sequencer with transverter

Don AE5K donj at ae5k.us
Mon Jun 17 13:44:34 EDT 2013


It appears I'm finally getting to a point of finally (after 10 years) 
using my DSP-10 with a 1296 transverter and power amplifier.  I'd like 
confirmation of my sanity (or the opposite!) in using the sequencing 
built into the DSP-10.

There's no problem in understanding use when the DSP-10 is used on 144 
MHz, but when a transverter is added in the chain, I'm not completely 
sure when it should be turned on or off.  It may not make that much 
difference, but I'd like to know that before actual hookup.

The equipment line up is DSP-10, a DEMI 1296-144 transverter, followed 
by a homebrewed 1296 transmit power amplifier / receive pre-amp.

The sequence (without consider the transverter) is shown below (copied 
from other DSP-10 documentation):

The sequence from receive to transmit is:

A. Receiver audio muted, receiver turned off, switch antenna relay to 
transmit.
B. Delay: (dly_ant2amp), default 50 ms.
C. Turn amplifier on.
D. Delay: (dly_amp2xmit), default 75 ms.
E. Place DSP-10 into transmit
F. Delay: 10 ms. fixed
G. RF out of DSP-10

The sequence from transmit to receive is:

H. DSP-10 transmit off
I. Delay: (dly_xmit2amp), default 25 ms.
J. Turn amplifier off.
K. Delay: (dly_amp2ant), default 25 ms.
L. Switch antenna relay to receiver
M. Delay: 2 ms. fixed
N. Turn on DSP-10 receive hardware
O. Delay: 20 ms. fixed (to remove pops)
P. Audio unmuted

Now, my thoughts about where the transverter should come is at step C 
and J in the list above.  Alternatively, my friend says it should be at 
E and H.

Comments?  Who is right, or does it make any difference?

73,
Don AE5K
EM36pc - near Yellville, Arkansas



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