At 07:49 PM 1/15/2021, Bob kb8tq wrote:
then indeed, the temperature sensitivity will go
way up. Most of the OCXOâs off these boards
are a sub $20 sort of item on eBay. How good are they? Who
Any suggestions for a SC-cut 5V OCXO? Searching
for "Trimble 73090" or "73090 OCXO" just brings
Quick update: tried using an AD780 reference + op-amp to offset the
EFC voltage. Worked great, until I slid everything back into the
enclosure and it was tuning the OCXO too high!
After several disassembly/mod/reassembly passes (all tuning too high
once boxed up), I punted and went back to
At 05:47 PM 1/13/2021, Oz-in-DFW wrote:
Well, four of these at $36/ea might make spec:
https://www.lacrossetechnology.com/products/617-249
What's not clear is if GMT is in the timezone selection list.
FAQ shows four timezones with no UTC and no 24 hour mode:
At 01:27 PM 1/12/2021, paul swed wrote:
Granted at 5V the varicaps may be at minimum. Use a 2K R. That should be
pretty safe.
Current limited bench supply though 4.7 k and an inline DMM to
monitor current. Made quick-n-dirty measurements of EFC voltage, EFC
current, and output frequency.
At 08:14 AM 1/12/2021, Bob kb8tq wrote:
Hi
The OCXO on the 73090 does not have an internal mechanical trimmer.
It is a 0 to 5V tune range.
Thanks! That saves me the effort of opening the can.
I think I'll cut the EFC trace and see how far I can pull it past 5
VDC (with a series resistor to
At 09:01 PM 1/11/2021, paul swed wrote:
Can you see what the xtal unit actually is.
Trimble "73090".
I suspect there is not a hole to a trimmer cap. But potentially if you can
I peeled the sticker from the top--no holes hidden there or on the four sides.
open it you could get to a cap
TL, DR: Trimble 73090 5V OCXO won't tune to 10 MHz (9.999 989 MHz at
0 VDC EFC, 9.999 997 MHz at 4.88 VDC EFC). Worth fixing? Maybe an
internal mechanical trim?
I've got one of those China special GPSDOs (thanks again, Paul!)
built around a surplus Trimble UCCM 57964 (or 57963?) board. PPS
At 10:52 AM 12/26/2020, Mike Feher wrote:
Are any of you aware of any La Crosse Ultra Atomic clocks with a 24 hour
format? Hope all had a great Christmas. Regards - Mike
Not sure if you're looking for analog or digital, but I found an
ancient digital La Crosse (WS-6002U) with "GMT" and 24
At 03:24 AM 2/26/2020, Tom Van Baak via time-nuts wrote:
aggressive phase microstepper. But in this case, if possible, I'd
prefer a simple single part; a plain old XO or OCXO solution. Do any
of you know where to get a 5.115 MHz crystal or oscillator?
Did the tbolt happen to use one? I've
At 01:10 PM 2/19/2020, Don Lewis wrote:
I see that Lady Heather is reporting PRN 08 as PRN 0O.  (NAVSTAR 74)
I'm seeing a good track in LH on PRN08 from at
least three GPS receivers right now.
--
newell N5TNL
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time-nuts mailing list --
At 10:25 AM 8/5/2019, tim...@timeok.it wrote:
The 10811 is a SC cut crystal oscillator and the 10544 is an AT cut.
I thought the 10544 used a BT rock. Seems like I measured the warmup
curve of my 5345A to verify this, but maybe I'm confusing something else.
--
newell N5TNL
At 02:14 PM 4/6/2019, Tom Van Baak wrote:
Would someone be a hero and record the raw subframe data from GPS
today? It's only 50 bits per second (that's about 8 bytes/second) per SV.
I've two uBlox LEA-6Ts recording RXM-SFRB (0x02 0x11) subframe data
with crummy indoor antenna positions (rain
At 07:38 PM 3/9/2019, jimlux wrote:
Has anyone tried a +5V to +15V DC/DC to run an OCXO, getting the 5V
from one of those rechargeable USB power bricks. I was thinking
about portable operation.
My USB power bricks shut off the 5 V output if there's not enough
load. Something to watch for.
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