[hpsdr] 31db attenuator

[kf5kog]

Hi All,

Regarding the 31db step attenuator on the Hermes boards.  I upgraded my
firmware to Protocol 2 T1000 and installed Thetis V2.3.11.  As I was going
through the level calibrations I noticed each step of the attenuator
appeared to work correctly.  Prior to using Thetis my attenuator steps
worked up to 16db, then the S meter would not maintain a constant level.
Sometime varying as much as 10db.  Now it is rock solid.  At least this
confirms the parts were good.  I was beginning think I bought a bum lot
from MiniC.


DAT-31A-SP+ were purchased from Mini Circuits a few years ago and I sold my
extras on eBay.  Some home brewers here my have purchased them
PCB came from Apache Labs unpopulated.

73, Stew
KF5KOG

On Tue, Apr 11, 2017 at 8:49 AM, k4kv <k4kv at k4kv.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Hello,
>
> I spent some time yesterday talking to a fellow at Mini-Circuits about the
> 6-bit attenuator.  The correct part is the DAT-31A-SP+, not the 31r5ASP+
> their website recommends.  When I first built my Hermes, the guy I bought
> the attenuators from got it wrong, then I bought new ones and replaced the
> ones I had.  That also did not work.
> That being said, the 6-bit part seems to be the future, so 'we' should
> consider changing to include either a 5-bit or a 6-bit part.
> The extra pin on the 6-bit part is only for power-up settings, and is moot
> after the first programming word is sent.
> Sorry for the confusion...
> 73
> Glen K4KV
>
>
>
>
> Sent from my Verizon Wireless 4G LTE smartphone
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help: http://lists.openhpsdr.org/
> listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20170504/f07e7f73/attachment.htm>