Re: 70 cm receiver inoperative with new CAN-Do module - More
Stephen,
All of the receiver power supplies are functional. My setup has not changed for a long time. I'm using the same cable harness and power supply as always. Communications are via a USB port, to a USB-to-serial dongle, to the CAN232, to the CAN-Do module. This has not changed since day-1.
The CAN-Do Net Controller Software is the same installation I've been running successfully for months. It appears to run as before. It finds the CAN232 immediately and then finds your module when I click the Query button.
I set the timing for 200 mSec and select a .can initialization file by clicking "Playback Log". I can then load the initialization data by clicking "heartbeat". The data appears to load at the normal rate I'm used to seeing. After loading the file there are no entries in the error log.
The only odd behavior is that I can always crash the application by selecting the waterfall log after the data has been initialized. The log appears to be empty when the application crashes. If I select that log BEFORE I load the file it comes up with no problem. I've tried loading different versions of the init file (I have about 10 for various frequencies and either internal or external reference) and they all result in both PLLs failing to initialize and a dead receiver.
Yesterday we stepped through the I/O lines one at a time using a DMM and toggling them using the GUI controls. They all appeared to be OK after some confusion initially. I can also toggle the power on and off although I'm bypassing it and feeding the receiver directly from the power supply.
The first LO is drifting around at 598 MHz. The second LO appears to be putting out RF at 126.4 and 253.2 MHz. These observations are made using a sniffer cable.
As I said in my earlier email, I'd like to completely rule out a bad CAN-Do module before tearing into the receiver, especially this close to the symposium. I'm willing to try anything you suggest, but if you have another module available I'd like to try that first.
73,
Juan - WA6HTP
Juan:
What kind of Can-Do module do you have?
We need to get this done so it can be presented as our one success this year at the annual meeting. Let's push this through.
Juan Rivera wrote:
Stephen,
All of the receiver power supplies are functional. My setup has not changed for a long time. I'm using the same cable harness and power supply as always. Communications are via a USB port, to a USB-to-serial dongle, to the CAN232, to the CAN-Do module. This has not changed since day-1.
The CAN-Do Net Controller Software is the same installation I've been running successfully for months. It appears to run as before. It finds the CAN232 immediately and then finds your module when I click the Query button.
As I said in my earlier email, I'd like to completely rule out a bad CAN-Do module before tearing into the receiver, especially this close to the symposium. I'm willing to try anything you suggest, but if you have another module available I'd like to try that first.
I agree with this.
73,
Juan - WA6HTP
Bob
Bob,
It's the CAN-Do PCB with the 40-pin header on it that normally would solder to the main PCB - the one with the EMI problem. I really didn't want to mess with the first one but no one stepped up to look into the EMI problem so I finally gave up and decided to do it myself. I wish I hadn't.
Now that one is dead and the replacement from Stephen appears to work but the receiver isn't initializing. I don't want to touch this receiver until I have completely ruled out a bad replacement CAN-Do module by trying another one. I'd rather build up a second receiver from scratch than start desoldering parts from this one. That is a huge effort to be doing right now. I also don't have all the parts I need so I'd have to pull some from this receiver. The chance of making things worse is very real if I have to dig into the receiver. Trying a third CAN-Do module has no risk.
73, Juan
-----Original Message----- From: Robert McGwier [mailto:rwmcgwier@gmail.com] Sent: Sunday, September 16, 2007 9:32 AM To: juan-rivera@sbcglobal.net Cc: 'Stephen Moraco'; David Smith; Dave Black (Work); Dave Black (Home); eagle@amsat.org; Samsonoff@Mac. Com Subject: Re: [eagle] Re: 70 cm receiver inoperative with new CAN-Do module - More
Juan:
What kind of Can-Do module do you have?
We need to get this done so it can be presented as our one success this year at the annual meeting. Let's push this through.
Juan Rivera wrote:
Stephen,
All of the receiver power supplies are functional. My setup has not
changed
for a long time. I'm using the same cable harness and power supply as always. Communications are via a USB port, to a USB-to-serial dongle, to the CAN232, to the CAN-Do module. This has not changed since day-1.
The CAN-Do Net Controller Software is the same installation I've been running successfully for months. It appears to run as before. It finds
the
CAN232 immediately and then finds your module when I click the Query
button.
As I said in my earlier email, I'd like to completely rule out a bad
CAN-Do
module before tearing into the receiver, especially this close to the symposium. I'm willing to try anything you suggest, but if you have
another
module available I'd like to try that first.
I agree with this.
73,
Juan - WA6HTP
Bob
participants (2)
-
Juan Rivera -
Robert McGwier