I posted this in reply to the original question in the Microwave list...
What you are describing is not an FRS-C but a box that contains an
FRS-C. I think it was some kind of Telco package. The box produces
versions of the 10 MHz from the FRS-C on two of the TNC's and a 15 MHz
sine generated from the 10 MHz on the third.
I bought one of these in 2004 and did some digging to try to figure out
what is inside. The results of this are in a document I created, here:
ftp://ftp.sonic.net/pub/users/rexa/FRSrubidium/rubid_notes.pdf
There's a version of the FRS-C manual in that same FTP directory.
My recollection is that the FRS-C is not very clean in phase noise. The
document should have all you need to get it working. If you learn any
more about what the mystery pins (11 - 25 on the DB-25) might have been
for, I'd be interested to hear about it.
-Rex, kk6mk
I see from the pin-out below, that some of the unknown pin signals have been
given names. Good to know.
[email protected] wrote:
Bill's connection info for Lucent FRS module, forwarded as agreed.
Nigel GM8PZR
In a message dated 02/06/2009 02:11:10 GMT Daylight Time, [email protected]
writes:
Much to my amazement, I did find some notes on the DB-25 15Mhz board
pinout:
1 +24V
2 +24V
3 Gnd
4 Gnd
5
6 Freq Adj (this goes directly to the FRS, the board does nothing with it)
7 Gnd
8 -Enable +
9
10 Enable - (notes are unclear on 8, 10, 11, 12. See note below)
11 To 11 on other unit
12 to Fault+ on other unit
13 External 1 (this goes to whatever the dual-osc unit plugs into,
function unknown)
14
15 External 2
16 Fault +
17 Fault -
18 Ready +
19 Ready -
20 Gnd
21 Standby +
22 Standby -
23
24
25
Pins with no assignment are not used.
Note - as mentioned in the previous post, two units cross-monitor each
other. One is selected as primary by a manual switch. The notes I found
didn't cover the details, but if I remember correctly, +/- enable
selects the primary (one unit is enabled, one disabled). Then, a fault
assertion by the primary will cause the secondary to become primary. The
secondary's 15Mhz output is disabled; only the primary provides an output.
The control lines are all TTL compatible, and are always provided in
complimentary pairs.
Finally, these pinouts came from tracing a live unit and observing
behavior. They might not be completely accurate, but they're close.
Bill Ezell
----------
They said 'Windows or better'
so I used Linux.
[email protected] wrote:
In a message dated 01/06/2009 02:23:46 GMT Daylight Time,
[email protected]
writes:
I did at one time have the connector pinout info, but since the board
is
fairly useless, I'm not sure I kept it. It does have some nice TNC
connectors and a nice crystal filter, if you happen to need a 15Mhz
filter.
-----------
Hi Bill
I did realise, after my posted request, that what was described in the
auction as a 15MHz oscillator was actually a 15MHz filter with 36KHz
bandwidth.
Not sure that I need one either:-), but if you do still have the
connector
pinout I'd be grateful for a copy.
regards
Nigel
GM8PZR
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
