[hpsdr] Pre-Selector alternative for Mercury - How to controll viaHPSDR/PowerSDR

[Phil Harman]

Hi Alexander,

Well there are a number of options as to how the Heros board could be used:

1. Add support to PowerSDR for it's USB port
2. Modify the PIC code to read the Command & Control data from the Atlas bus 
and select the correct relays depending on what frequency HPSDR is set to.
3. Replace the USB board with one fitted with an SPI or I2C open 
drain/collector driver chip(s) and send the required signals from Ozy or 
Mercury. This is basically how the relays on Alex are switched.
4. Use the 7 open collector outputs on Penny to control the band select 
relays plus 8 open collector drivers connected to J20 on Ozy.
5. Connect open collector/drain drivers to spare Atlas bus lines and add 
suitable  code to  Ozy to drive them.

I think the schematic of Heros has an error  - the input and output 
transformers should be rotated 180 degrees.

73's Phil....VK6APH


----- Original Message ----- 
From: "Alexander Geckeler" <alexander.geckeler at gmx.de>
To: <hpsdr at hpsdr.org>
Sent: Sunday, March 29, 2009 4:55 AM
Subject: [hpsdr] Pre-Selector alternative for Mercury - How to controll 
viaHPSDR/PowerSDR


> ***** High Performance Software Defined Radio Discussion List *****
>
> Hello together!
>
> Today I found within the Anie HPSDR Wiki entry an interesting commercial
> alternative of a pre-selector which is called *Heros tiny SCR
> Preselector, *It will cost 79 GBP as a kit. A passable price...
>
> This pre-selector (1.8 Mhz to 30 Mhz) is controlled via usb and
> software, and because of this it is intersting for SDR.
>
> Technical details can be found in the assembly booklet pdf file:
> http://www.herostechnology.co.uk/pdf/Heros%20tiny_SCR_Preselector_kit_Assembly_Manual_revW.pdf
>
> My question is:  Do someone already know this pre-selector and maybe has
> a practical idea how this could be controlled by HPSDR / PowerSDR?
>
>
>
>
> -- 
> _________________________
> Alexander Geckeler
> Fruchtallee 9
> 20259 Hamburg
> Deutschland
>
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at hpsdr.org
> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
> HPSDR web page: http://hpsdr.org
> Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/


--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.0.238 / Virus Database: 270.11.31/2027 - Release Date: 03/27/09 
18:51:00


 1238311582.0