[hpsdr] Filter Switching for Out of Band Band Use

[Joe Martin K5SO]

Hi Jim, 

Unless I’m missing something in your explanation, it seems to me that selecting “manual” Alex switching mode in PowerSDR, then using the “by-pass” options and/or setting whatever switch points you desire in terms of filter/frequency range specified for that filter you desire for any of the desired frequency ranges you like in the Setup > Alex > HPF/LPF menu should allow you to do what you wish, yes?   There is a huge amount of flexibility in terms of configuration options available within that manual Alex menu.   

As far as using one of the open collector outputs to do whatever you wish, that capability is certainly supported in the Hermes firmware.  I’m not sure at the moment whether or not the current version of PowerSDR implements a menu-selectable option for control of the Open Collector Outputs generally but the firmware would certainly repsond to such controls if commands from the software were sent to the hardware in accordance with the current USB comm protocol document (v1.54, I believe is the latest protocol description document).  The comm protocol document can be downloaded from http://svn.tapr.org/repos_sdr_hpsdr/trunk/Documentation.  

If there is no generally available menu within the public version of PowerSDR presently to allow user control of the Open Collector Outputs, it would not be difficult to modify a version of PowerSDR to do precisely what you wish with regard to Open Collector Output control.  If there isn’t an already-accessible method within the public PowerSDR program for you to do that I’d be happy to try to modify a speical version for you that will do it.   Or perhaps Doug W5WC has some comments/suggestions about some features within his current public PowerSDR version, that are unknown to me at the moment, that will fill the bill as far as giving you control of some of those Open Collector Outputs.  

73, Joe K5SO


 
On May 14, 2014, at 7:10 AM, Jim Gailer wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi
> 
> I am using a PA3AKE receive filter set with Hermes
> <http://martein.home.xs4all.nl/pa3ake/hmode/bpf_intro.html>. My filter unit
> has band pass filters for the 160, 80, 40, 30, 20, 17, 15, 12, 10 and 6
> metre bands, currently with a pass-through on 60 metres. I have built a new
> decoder for the filters that decodes the band select lines on J12 (the I2C
> interface seems not to cater for all separate band selects). These filters
> are not much wider than the amateur bands and have >80dB out of band
> rejection, so for use out of band, I need to select the pass-through
> position.
> As far as I can tell, when tuning departs from the amateur band or when GEN
> or WWV is selected, the filter select lines set an appropriate (Alex based?
> filter.
> Does anyone know of a work-around for this? (For me, asserting one of the
> spare open collector lines would be ideal!) I would prefer not to access the
> CAT interface for this, but it may be the only solution.
> 
> Regards Jim G3RTD
> 
> 
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