[hpsdr] 10MHz level into Mercury??

[Helmut, DC6NY]

Hi Paul,

don't apply TTL-level to the Atlas bus or Mercury directly. More than 3.3V
will destroy the FPGA port! You have to convert the level. The easiest way
could be a resistive voltage divider.
In my case I used a buffer with OPA350.

/3, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Paul Wende
Gesendet: Sonntag, 10. März 2013 19:30
An: hpsdr at lists.openhpsdr.org
Betreff: [hpsdr] 10MHz level into Mercury??

***** High Performance Software Defined Radio Discussion List *****

Hi fellows,

Continuing playing with an external 10MHz source, working with what I have
before I decide to start spending money. A while ago, Phil replied to
somebody about putting a 10MHz signal into Mercury, directly, before
Excalibur was made, and he said the level should be 3.3 max, but he said the
circuitry may be able to handle TTL levels, but hadn't been tested.

Has anyone used TTL levels for the 10MHz signal, directly to the Atlas bus,
or to the TCXO pads on Mercury? I have some very nice OCXO's, HP etc. that I
want to try before going to Rb or GPSDO.

73
Paul
VE7KHz

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