[hpsdr] Mercury Preamp off anomally

[ENDO]

Hi Graham, and All

The long awaited K1 relay arrived the day before yesterday. It took almost
1.5 monthes after the order to a Tokyo Akihabara shop.
Then today I replaced K1 relay. However, the signal continues lost when
preamp off.
The last one is ATT, I found each of R50 and R49 is open.
This kind of damage can happen.

Regards,
Tokio
JA1CCA

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org]On Behalf Of ENDO
Sent: Monday, December 14, 2009 3:45 PM
To: Graham / KE9H
Cc: hpsdr at openhpsdr.org
Subject: Re: [hpsdr] Mercury Preamp off anomally


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

Hi Graham,

Thank you for your reply.
I input the signal and I checked by using Spectrum Analyzer. I found relay
K1 works, the contact damaged.
I will replace the relay K1.

Tokio
JA1CCA

-----Original Message-----
From: Graham / KE9H [mailto:KE9H at austin.rr.com]
Sent: Sunday, December 13, 2009 9:56 AM
To: ENDO
Cc: hpsdr at openhpsdr.org
Subject: Re: [hpsdr] Mercury Preamp off anomally


ENDO:
Very likely the relay.
There have been several of them fail.
73's
--- Graham / KE9H

==

ENDO wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi All,
>
> I enjoy HPSDR Mercury and Penelope.
> Yesterday I powered off Mercury when PowerSDR was still running.
> Restarting Mercury with Preamp off, no signal I can hear, however Preamp
on
> it works.
>
> Afterwards I re-programmed Mercury firmware and re-installed PowerSDR.
> The situation doesn't change. I watched the schematic where there is a
relay
> K1 which insert the ATT.
>
> Preamp On means no ATT, Off means insert the ATT.
>
> I found K1 relay works, but the contact may be damaged. It is hard to
> understand.
>
> Is there someone to expereince this kind of problem?
>
> Regards,
>
> Tokio
> JA1CCA
>
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