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Re: HSUSB Problem -- Help!

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  • Christos Nikolaou
    Javier, Imagine that I had two of Dave s boards because I wanted one for my multiband rig and the other for the N2PK VNA. I managed to damage both of them on
    Message 1 of 4 , Nov 30, 2008
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      Imagine that I had two of Dave's boards because I wanted one for my
      multiband rig and the other for the N2PK VNA.
      I managed to damage both of them on different occasions.

      The first was like you on the PTT send command and the second was on
      the I2C pins whereas also my LVDS Si570 got damaged.
      Juat for info, the Si570 is still starting and oscillating in its
      default frequency, but it cannot be programmed any more, probably only
      its own intrnal I2C interface has been blown and not the rest of the IC.

      The CY7C68013A chips themselves seem intact in terms of programing and
      utilization of other pins. Only the specific damaged pins are the problem.

      As they say though, there is always some good inside a mishap like this.
      The good at least for me, was that I utilized my 995xs as VFOs and
      proved excellent !! It could also go really down to my LF activity on
      137KHz without the problems of low frequency in Si570. And the spurii
      was also very good. Then I also remembered that the 995x has an
      internal log detector that can be utilized for forward or reverse
      power measurments. So the PowerSDR-IQ will display real
      forward/reverse power readings on its meter soon.

      So a drop of cable and a mishap, brought a new and enjoyable path !! :-)

      Christos SV1EIA

      --- In powersdr-iq@yahoogroups.com, Javier Fernandez
      <javier_fernandez09142@...> wrote:
      > Christos:
      > I was hoping that someone would point out something obvious that I
      had missed and be embarrassed for a few seconds before I went on to
      fix the problem.
      > Oh well, such is life. I will rig a manual PTT control line for now
      and order replacement chips.
      > Thanks for the help!
      > 73 de Javier,
      > KC2QII
      > ________________________________
      > From: Christos Nikolaou <sv1eia@...>
      > To: powersdr-iq@yahoogroups.com
      > Sent: Saturday, November 29, 2008 9:29:48 PM
      > Subject: [powersdr-iq] Re: HSUSB Problem -- Help!
      > Javier,
      > It seems that you've send somehow +12v on these pins... sorry to say
      > that but it has happened to me twice so far.
      > Just like you, on a re-arrangement of things a 12v cable dropped and
      > touched some pins of the Cy7C68013A, the rest is written in my order
      > to Dave for CY replacement chips !!
      > The Cypress chip is a LV so the absolute maximum ratings for its pins
      > is quite low.
      > The exact same tests as you did, I was also performing, to check what
      > pins got affected. The result is that if 12v touches one pin, its left
      > and right although not connected are also blown.
      > The good thing is that in your case these replacements can be in a
      > couple of days at your home, whereas here it needs around three weeks...
      > 73,
      > Christos SV1EIA
      > --- In powersdr-iq@ yahoogroups. com, "javier_fernandez09 142"
      > <javier_fernandez09 142@> wrote:
      > >
      > > After a couple of days of troubleshooting, I am finally come to the
      > > group for help.
      > >
      > > My HSUSB was working fine in my four RxTxv6.2 SDR until a couple of
      > > days ago, when I decided to change the RF output relay assembly.
      > >
      > > Once, finished, the radio performed as before, but it would not go
      > > into XMIT mode, with PowerSDR TUN or external application PTT.
      > > PowerSDR displayed the normal screen during PTT and TUN.
      > >
      > > Voltage checks of H3 Pin 3 showed a constant low condition, regardless
      > > of PowerSDR PTT state.
      > >
      > > Just to be safe, I uninstalled the HSUSB driver, downloaded and
      > > installed a fresh copy from the PowerSDR-IQ Google code, with no
      > > change in symptoms.
      > >
      > > By this point, I removed the HSUSB board from the system, and set it
      > > up for stand alone testing, with an external 5V source.
      > >
      > > I also downloaded and installed a fresh copy of FX2 Commander from
      > > David's site. Running the application, I found I could set and reset
      > > all the bits on PA and PB ports successfully. On Port PD, which is
      > > the one associated with the H3 Header, I could set and reset only
      > > ports PD0 through PD4. Ports PD5 through PD7 would not change state
      > > as measured with a voltmeter. Of course, PD6 is the one I am
      > > interested in, since it is the RX(low) TX High line, from PowerSDR-IQ.
      > >
      > > At this point, it seems to me that either a hardware problem in the
      > > CY768013A chip, corrupted firmware, or the FX2 Commander does not work
      > > on the last three lines of port PD with Christos' SV1EIA HSUSB Device.
      > >
      > > Any ideas?
      > >
      > > 73 de Javier
      > >
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