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--- On Wed, 23/6/10, Leigh L. Klotz, Jr WA5ZNU le...@wa5znu.org wrote:
From: Leigh L. Klotz, Jr WA5ZNU le...@wa5znu.org
Subject: [time-nuts] FRS-C TTL / sine outboard filter question
To: time nuts time-nuts@febo.com
Date: Wednesday, 23 June, 2010, 5:54
At the local flea market, I picked up
...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Leigh L. Klotz, Jr WA5ZNU
Sent: Wednesday, June 23, 2010 12:54 AM
To: time nuts
Subject: [time-nuts] FRS-C TTL / sine outboard filter question
At the local flea market, I picked up what appears to be an Efratom
FRS-C. It is marked TTL
Jun 2010 21:54:01
To: time nutstime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] FRS-C TTL / sine outboard filter question
At the local flea market, I picked up what appears to be an Efratom
FRS-C. It is marked TTL
At 12:54 AM 6/23/2010, Leigh L. Klotz, Jr WA5ZNU wrote...
At the local flea market, I picked up what appears to be an Efratom
FRS-C. It is marked TTL internally. It has the passive connector
board, but not the active board with the 15 MHz synthesizer on it.
Connector board? No such beast
In a message dated 23/06/2010 14:12:00 GMT Daylight Time,
mi...@flatsurface.com writes:
At the local flea market, I picked up what appears to be an Efratom
FRS-C. It is marked TTL internally. It has the passive connector
board, but not the active board with the 15 MHz synthesizer on
...
Mine is marked TTL internally. The service manual has a chart
showing the differences between the sine and TTL options, and I
converted it to the sine version by changing a jumper to a resistor
and populating an LC filter with 10uH and 100pF (~5 MHz). I also
terminated the RF
Mike S wrote:
It sounds like you made the changes to the A4 oscillator board, but not
the ones to the A3 power supply board (several inductors, resistors
and caps). I found that using a 1 uF for C16, instead of the
documented 0.1 uF, gives a better signal.
See the top of page A-15 in the
...
[snip]
If you need a sine wave output but don't want to change anything inside,
just add a lowpass filter.
A 5th order LPF (three inductors/ 2 caps or vice versa) should give you
a clean sine wave output.
Just add a coupling cap to remove the DC component.
Adrian
_
Thank you,
At 04:19 PM 6/23/2010, Leigh L. Klotz, Jr. WA5ZNU wrote...
If you have these values we can document the rest of this process in
one
place.
10 MHz sine TTL
L1 ?.? uH L1 OMIT
L2 1? uH Replace with R23 130 OHM 1 WATT
R16 ?10 OHM NOM
. WA5ZNU le...@wa5znu.org
Sender: time-nuts-boun...@febo.com
Date: Wed, 23 Jun 2010 13:44:37
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] FRS-C TTL / sine
Thank you, Didier.
That pretty much sums it up. I was aware of the signal level issue but
didn't consider that passband ripple would be temperature sensitive. It's
fun learning to think in the long time domain.
In the meantime I've found a 10 mbit ethernet ISA card in my office and
will follow
. Klotz, Jr. WA5ZNU
Sent: Wednesday, June 23, 2010 6:15 PM
To: did...@cox.net; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FRS-C TTL / sine outboard filter question
Thank you, Didier.
That pretty much sums it up. I was aware of the signal level issue but
didn't
To: Didier Juges via Cox
Subject: RE: [time-nuts] FRS-C TTL / sine outboard filter question
Sent: Jun 23, 2010 8:41 PM
I do not understand why the passband ripple would be of any consequence in
the big (or small as we typically talk about) picture. During any
measurement interval
At the local flea market, I picked up what appears to be an Efratom
FRS-C. It is marked TTL internally. It has the passive connector
board, but not the active board with the 15 MHz synthesizer on it.
Mine is marked TTL internally. The service manual has a chart showing
the differences
22, 2010 9:54 PM
Subject: [time-nuts] FRS-C TTL / sine outboard filter question
At the local flea market, I picked up what appears to be an Efratom
FRS-C. It is marked TTL internally. It has the passive connector
board, but not the active board with the 15 MHz synthesizer
What load do you have it running into? It maybe that you need to load
it into 50 ohms.
Steve
On 23 June 2010 16:54, Leigh L. Klotz, Jr WA5ZNU le...@wa5znu.org wrote:
At the local flea market, I picked up what appears to be an Efratom FRS-C.
It is marked TTL internally. It has the passive
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