[hpsdr] 31db attenuator

[kf5kog]

I have some DAT-31A-SP+ left over from a Hermes build.  contact me off list
with your shipping information.
kf5kog at aol.com

73, Stew
KF5KOG

On Tue, Apr 4, 2017 at 10:18 AM, Helmut <dc6ny at gmx.de> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Funny Glen! My national distributor offers DAT-31A-SP+ (5 Bit, 1 dB step)
> at
> 25 pieces minimum quantity. Maybe someone on the list has spares availanle.
> Good luck.
>
> 73, Helmut, DC6NY
>
>
> -----Ursprüngliche Nachricht-----
> Von: K4KV [mailto:k4kv at k4kv.com]
> Gesendet: Dienstag, 4. April 2017 14:44
> An: Helmut; 'hpsdr'
> Betreff: Re: AW: [hpsdr] 31db attenuator
>
> Helmut,
>
>
> My point is that you CANNOT get the 31db part any more!  At least I
> cannot find any.
>
> So, we are now stuck with the 6-bit part, and I do not know what to do
> about it.  I am able to
>
> change the code myself, but the learning curve would be steep.  I have
> written C code for more than
>
> 20 years, but that is a long way from FPGA Quartus programming with no
> experience!
>
> ;-)
>
> 73
>
> Glen K4KV
>
>
>
> On 4/4/2017 08:29, Helmut wrote:
> > Glen, I don't believe that you will get happy with a 0.5 dB version.
> Correct
> > S-meter reading or automatic PS-feedback-adjustment probably need 1 dB
> > steps.
> >
> > 73, Helmut, DC6NY
> >
> > -----Ursprüngliche Nachricht-----
> > Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von
> K4KV
> > Gesendet: Dienstag, 4. April 2017 13:43
> > An: hpsdr
> > Betreff: [hpsdr] 31db attenuator
> >
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > Hello,
> >
> > I have been struggling for some time with the rx attenuator on my
> > hand-built Hermes boards.  I felt like the
> >
> > mini-circuit part never worked correctly.  I just got in some brand new
> > chips and replaced the chip.  No
> >
> > difference!
> >
> > I got both the old and the new data sheets.  The new part is the
> > DAT-31R4A SP+
> >
> > It is 6-bit and in 0.5db steps.  The original part is 5-bit and in 1 db
> > steps.
> >
> > So, it is my contention, that this could never work correctly. The only
> > part that is available is the new part, the
> >
> > 6-bit part.
> >
> > The reason I verified this is that I got an older Hermes board that was
> > factory built and repaired it.  It has the old
> >
> > mini-circuits part, and works as it should.
> >
> >
> > Can someone make me a version of Hermes code, or can we make a version
> > that supports both the 5-bit and 6-bit
> >
> > parts?  I did not get that deep into the programming of the chip, but it
> > may be as simple as always sending a 6
> >
> > bit code, and moving the old 5-bit data to the end.
> >
> > 73
> >
> > Glen K4KV
> >
> >
> >
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