[hpsdr] 31db attenuator

[Helmut]

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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