What I meant was - 10 MHz going up the cable, and 75 MHz coming down.
Rob K
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of paul swed
Sent: 08 April 2011 6:35 PM
To: Discussion of precise time and frequency measurement
Subject: Re:
Another thought - I know it was 75 MHz coming down, as they had some
problems from interference from a VHF transmitter on one installation which
was in that band.
Rob K
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of paul swed
Sent: 08
On 04/09/2011 11:57 PM, Chuck Harris wrote:
Hi Brooke,
My recollection of first seeing the 4K7 style of marking was
around about the time computers started being used for inventory
control... 1970's. It was only the European companies that
were doing it. It eliminated the confusion caused by
On 04/10/2011 01:51 AM, Mike S wrote:
At 06:53 PM 4/9/2011, Joseph Gray wrote...
I have an old Arcnet hub that I want to salvage the isolated BNC
connectors from. Arcnet used 93 Ohm coax. I know that there are 50 Ohm
and 75 Ohm versions of BNC connectors, but the ones from the hub look
like a
Magnus Danielson wrote:
On 04/10/2011 01:51 AM, Mike S wrote:
At 06:53 PM 4/9/2011, Joseph Gray wrote...
I have an old Arcnet hub that I want to salvage the isolated BNC
connectors from. Arcnet used 93 Ohm coax. I know that there are 50 Ohm
and 75 Ohm versions of BNC connectors, but the ones
On 04/10/2011 01:44 PM, Bruce Griffiths wrote:
Magnus Danielson wrote:
On 04/10/2011 01:51 AM, Mike S wrote:
At 06:53 PM 4/9/2011, Joseph Gray wrote...
I have an old Arcnet hub that I want to salvage the isolated BNC
connectors from. Arcnet used 93 Ohm coax. I know that there are 50 Ohm
and
Rob understood what you meant. My comment was that the 1st mixer and local
oscillator is at 1500 Mhz. So the system has to multiply 10 MHz to 1500 and
mix it to produce the 75.42 MHZ IF. Luciano was saying it was a multiplier
chain and I was thinking out loud about the numbers that could have been
From what I recall from our candle lit lab, the 75 ohm
BNCs had a slightly larger pin and would open up the
50 ohm females just a skoosh so when you put a
50 ohm, into a 50 ohm that had been tweaked by a
75 ohm, they were noisy or intermittent.
Greg
On 4/10/2011 5:30 AM, Magnus Danielson wrote:
Types
BNC connectors exist in 50 and 75ohm
http://en.wikipedia.org/wiki/Ohmversions, matched for use with
cables of the samecharacteristic impedance
http://en.wikipedia.org/wiki/Characteristic_impedance. The 75 ohm
types can sometimes be recognized by the reduced or absentdielectric
I had remembered that it was a 75 ohm that would damage a
50 ohm socket. This article states that a 50 ohm would
damage a 75 ohm socket.
Greg
Indeed, the 75-ohm will have the smaller inner, and hence may be damaged
by the larger pin on the 50-ohm connector.
David
GM8ARV
--
SatSignal
Magnus Danielson wrote:
On 04/09/2011 11:57 PM, Chuck Harris wrote:
Hi Brooke,
My recollection of first seeing the 4K7 style of marking was
around about the time computers started being used for inventory
control... 1970's. It was only the European companies that
were doing it. It eliminated
Greg Broburg wrote:
receivers used 75 ohmantenna
http://en.wikipedia.org/wiki/Antenna_%28radio%29inputs, so they
often used 75 ohm BNC connectors.
I had remembered that it was a 75 ohm that would damage a
50 ohm socket. This article states that a 50 ohm would
damage a 75 ohm socket.
Greg
Chuck Harris wrote:
Greg Broburg wrote:
receivers used 75 ohmantenna
http://en.wikipedia.org/wiki/Antenna_%28radio%29inputs, so they
often used 75 ohm BNC connectors.
I had remembered that it was a 75 ohm that would damage a
50 ohm socket. This article states that a 50 ohm would
damage a 75
Thanks for all the input. I looked closely at the connectors and they
seem to match some 50 Ohm connectors that I have. I have removed them
from the board and now have eight isolated BNC connectors for my
project.
Joe Gray
W5JG
___
time-nuts mailing
Bruce Griffiths wrote:
Hal Murray wrote:
bruce.griffi...@xtra.co.nz said:
The 16MHz is necessary for the loop to function: The mixer mixes
down the
26MHz to a pair of conjugate frequencies, 10MHz and 16MHz. Thermal and
device noise is sufficient to start the process.
10MHz = 26MHz - 16MHz
Bruce Griffiths wrote:
Bruce Griffiths wrote:
Hal Murray wrote:
bruce.griffi...@xtra.co.nz said:
The 16MHz is necessary for the loop to function: The mixer mixes
down the
26MHz to a pair of conjugate frequencies, 10MHz and 16MHz. Thermal
and
device noise is sufficient to start the process.
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