[hpsdr] Alex Interface Issue on Hermes

[Helmut]

Sorry Don, I forgot: Check the inputs of the TBIC6B595
(http://lib.chipdip.ru/205/DOC000205319.pdf )in particular enable Pin9 (G
invers)

73, DC6NY

-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Helmut
Gesendet: Freitag, 8. Juli 2016 17:02
An: dlwaddel at netzero.net; hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Alex Interface Issue on Hermes

***** High Performance Software Defined Radio Discussion List *****

Don,
 
Each output of the SPI decoder can deliver 150 mA (all outputs on). I don't
think that you need this current for two relays, which are engaged for each
band control. Maybe that helps.

73, Helmut, DC6NY 

-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von
dlwaddel at netzero.net
Gesendet: Freitag, 8. Juli 2016 15:56
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Alex Interface Issue on Hermes

***** High Performance Software Defined Radio Discussion List *****

Thanks to those who have made suggestions. The cable is plugged in correctly
and the power must be getting to the Alex board for all the relays to
energize. Likewise, if the cable were not plugged in correctly, the relays
would not energize and the LEDs would not light. All three LEDs stay lit,
one being the power indicator.

The real questions would seem to be: 
What can cause all the Alex relays to energize at the same time? 
Is the SPI_SCK supposed to be present all the time or only when changing
bands?
What is the origin of the SPI_SCK?

Don
K3DLW

>
>***** High Performance Software Defined Radio Discussion List *****
>
>I have a Hermes that energizes all filter relays on the attached Alex Tx
board when power is applied. The relays stay energized until power is
removed regardless of band selected in PowerSDR. Need help troubleshooting.
Suggestions anyone? 
>
>Background:
>I have two Hermes systems: one connected to Alex and Munin that works great
and that I have been using for several years, the second that I have been
working on for several years that I want to connect to a 300 watt PA with
its own filters.
>
>The second Hermes seems to receive and transmit just fine when not
connected to the PA. I have a Alex Tx board that I am using to check
operation of the Alex interface before connecting the Hermes to the PA. The
Alex Tx board operates correctly when connected to the operational Hermes
system, so no problem with the Alex board.
>
>I replaced U20, hoping that was the problem. This did not help. When I
monitor the SPI_SCK on pin 4 of the Alex interface using an oscilloscope,
the signal changes state right after power is applied to the Hermes, then
stays unchanging. I would expect a pulse train for a clock signal.
>
>SPI_DO on pin 3 of the Alex interface goes high when power is applied to
Hermes and stays high. I would expect a pulse train for a serial data
signal, at least for a short period of time initially and anytime the band
is changed.
>
>I do not see the SPI_CLK signal on pin 83 of U9 either.
>
>The impression I get is that U9 is not generating the data and clock to
send to the Alex interface. And yes, I have Alex selected in PowerSDR. :)
Actually, I used the same instance of PowerSDR that I use on the operational
Hermes system with all the same settings.
>
>Don
>K3DLW
>

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