Hej Ulf,
On 05/08/2014 01:14 AM, Ulf Ralberg wrote:
Bought an LPRS-01 on eBay too. Of course it only locked for a few
seconds. Got some valuable hints from Magnus Danielsson that steered me
in the right direction - the VCXO was probably saturated. After some
inspection, I conluded there were no
Hi,
I bought a used Temex LPFRS-01 / LPRO from fluke.l on ebay. Unfortunately the
unit is broken and shows the same defect as was mentioned about a year ago on
this list: after warm-up it locks for a few seconds, but lock is lost again
after a few seconds. The lock output pulls low for a few
Hi
Check the output frequency of the unit as it sweeps. I'd bet it's not quite
making it to 10 MHz. Look for a trimmer cap near the master crystal. It should
be possible to tweak it so the sweep makes it to either side of 10 MHz.
Bob
On May 26, 2013, at 1:43 PM, Gerd v. Egidy li...@egidy.de
I don't have an LPFRS, but if I'm reading the manual correctly, the
fourth column of numbers on the 'M' command (4D, 4C on your screen
capture) is the VCXO control voltage. Shouldn't this be continuously
sweeping up and down until it finds lock? Does the output frequency
sweep up and down
Hi Ed,
I don't have an LPFRS, but if I'm reading the manual correctly, the
fourth column of numbers on the 'M' command (4D, 4C on your screen
capture) is the VCXO control voltage. Shouldn't this be continuously
sweeping up and down until it finds lock?
You are right, it sweeps the control
Hi Gerd,
When it locks for a few seconds, make a note of the VCXO control
voltage. Watch it as closely as you can during the lock period. Is it
very near one end of the sweep range? Does it then drift off the end of
the range when lock is lost? That behaviour would suggest that the VCXO
Hi Ed,
When it locks for a few seconds, make a note of the VCXO control
voltage. Watch it as closely as you can during the lock period. Is it
very near one end of the sweep range? Does it then drift off the end of
the range when lock is lost? That behaviour would suggest that the VCXO
