[DSP-10] Sanity check for sequencer with transverter

[Don AE5K]

Once again, hello Mike,

You seem to always be a treasure trove of information about the DSP-10!

So, your conclusion is the same as mine, in my case I switch transverter 
to transmit at my step C along with the power amp on, and off on step J 
when power amp is turned off.  Makes sense!

The only problem remaining is that my homebrew amplifier (don't know who 
made it) has only one control input and that switches both the P.A. on 
and the antenna relay inside the same case to transmit position.  It 
appears that will be OK since the DSP-10 should not be putting out any 
signal at that time going from receive to transmit, and on TX->RX the 
DSP-10 stops r.f. output before switching the antenna back to receive.  
I think I'm covered OK.

I got to be looking at the spare outputs, E1, E2, and E3, and see that 
they must require some added code in the program to utilize. Don't need 
them, so didn't pursue further as I have enough on my plate right now.

Thanks once again,
73, Don AE5K

On 06/17/2013 02:29 PM, kd7ts wrote:
> On Mon, 17 Jun 2013 10:44:34 -0700, Don AE5K <donj at ae5k.us> wrote:
>
>> 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?
>>
>
> Hi Don,
>
> Just spent a bunch of time with this very question. I would take it in 
> the order from antenna to DSP-10. There are two thing to avoid, 
> transmitting into a receive mixer and switching the antenna relay 
> while power (RF) is generated.
>
> I tried to simplify the list by moving the delays to the lines where 
> they apply. So ...
>
> Switch ant relay to transmit, Rcv audio muted, receiver off, Delay: 
> (dly_ant2amp), default 50 ms. PIN 2
> Turn amplifier on.          Delay: (dly_amp2xmit), default 75 ms. PIN 1
> Place DSP-10 into transmit       Delay: 10 ms. fixed
> DSP-10 transmit on
>
> DSP-10 transmit off    Delay: (dly_xmit2amp), default 25 ms.
> Turn amplifier off.         Delay: (dly_amp2ant), default 25 ms. PIN 2
> Switch antenna relay to receiver   Delay: 2 ms. fixed PIN 1
> Turn on DSP-10 receive hardware,  Delay: 20 ms. fixed (to remove 
> pops), Audio unmuted
>
> A complete R/T/R cycle is  A - G, G - A starting from receive.
>
> There are only the outputs of PIN 1 and PIN 2 of the accessory jack, 
> and if the requirement is to NOT "hot switch" the antenna relay, 
> everything else will need to key from the "Power Amp on", PIN 1.
>
> That is a really complex list, but when you boil it down, there are 
> only PIN 1 and PIN 2 that are switching states.
>
> It appears to me that the transverter and PA will have to double up on 
> PIN 1.
>
> 73 Mike KD7TS
> ______________________________________________________________
> DSP-10 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/dsp-10
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:DSP-10 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>