All VFD displays (and EL and CCFL LCD backlights) have finite lifetimes. Very
few will last over 40,000 hours (5 years). Many start to noticeably degrade
after one year. Many EL backlights have lifetimes of less than 5000 hours
(ever see a Tektronix 1502/1503B/C TDR with a good backlight?)
What is the power splitter glued on some of the Thunderbolt units meant for ?
Apparently it is good up to 500 MHz, so it can't be used for the signal coming
from the antenna.
Maybe it was just part of complete product which the Thunderbolt was part of.
Just curious
73 Alberto I2PHD
Tom Van Baak wrote:
It was used with the 10 MHz output; either to split the output
or to combine with a phased locked 10 MHz backup source
(we've seen this on other telecom frequency references).
Sounds like a nice little 'freebe' for some. :-)
I can understand that it would be better to
Any info available ?
Name is a little misleading as this unit is RF filters and preamp.
Contains 4 adjustable filters first is switch selectable for peek or null,
other 3 are null, and one band pass filter 29Khz to 100Khz. May be similar to
2084 Multifilter one output shared between front
When you have a RFTG-m-XO and Rb pair, do you connect both
J5 and J6 on each unit or just J5?
Scott
Scott Mace wrote:
Has anyone tried to discipline the RFTG-m-RB without the -XO unit from
a house PPS feed?
I think pins 4 and 8 on J6 are the PPS input.
Scott
I too have never seen one go dim. In fact, I have a VCR (Beta!) that's been
pluged in continously since I got it new in the early '80s. It still looks the
same as when I got it except that the display has had a left to right wave
going through it since about 1995. So, wavy- but not dim at
From my thermionic valve days,
the emmissivity of a filament was greatly extended by under-running
them.
If the display is pemanently run at a lower current in dim mode,
how long could the life be extended by dropping the filament voltage
by a small margin?
cheers, Neville Michie
On
change in email address:
??? was: ? is:
?? [EMAIL PROTECTED] [EMAIL PROTECTED]
Thanks,
Bill Hanna
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