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MEC with 75 ohm termination [message #87229]

Tue, 26 June 2007 20:04

Wayne Carson

Messages: 86
Registered: June 2007

Member

Hi group,

Per this groups opinions and experience, I couldn't decide on a clock or a
DAC so I ordered them both. It stings $$$$ but I should be a happy camper
come the weekend.

The Big Ben with a 3' quality cable is on the way and I don't know whether
the MEC is un-terminated or terminated. I have the MEC booklet but it
doesn't state it. For the time being the I just need one word clock out of
the Big Ben to the MEC. If un-terminated, then the Big Ben user's manual
says I need to connect a BNC "T" with a 75 ohm termination. If the MEC is
correctly terminated, then I can just connect the clock in and fire it up.
For now the MEC is the last and only interface in the clock chain and per
the BB manual it states that the last item needs to be terminated.

What do you guys and gals know about this? Do I need the "T" and 75 ohm
terminator or is the MEC correctly terminated?

Thanks,
Wayne
Paris since '97

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Re: MEC with 75 ohm termination [message #87233 is a reply to message #87229]

Tue, 26 June 2007 20:40

Deej [4]

Messages: 1292
Registered: January 2007

Senior Member

I used a terminator cap on my MEC outputs and they were happier for it. I
don't know about the
BB. You do not want to "chain" your devices if you can help it. Run a
separate BNC cable to each device you want to clock. Make the cables of
equal length if possible.
Deej

"Wayne Carson" <carson_wayne@msn.com> wrote in message
news:4681d562@linux...
> Hi group,
>
> Per this groups opinions and experience, I couldn't decide on a clock or a
> DAC so I ordered them both. It stings $$$$ but I should be a happy camper
> come the weekend.
>
> The Big Ben with a 3' quality cable is on the way and I don't know whether
> the MEC is un-terminated or terminated. I have the MEC booklet but it
> doesn't state it. For the time being the I just need one word clock out
> of the Big Ben to the MEC. If un-terminated, then the Big Ben user's
> manual says I need to connect a BNC "T" with a 75 ohm termination. If the
> MEC is correctly terminated, then I can just connect the clock in and fire
> it up. For now the MEC is the last and only interface in the clock chain
> and per the BB manual it states that the last item needs to be terminated.
>
> What do you guys and gals know about this? Do I need the "T" and 75 ohm
> terminator or is the MEC correctly terminated?
>
> Thanks,
> Wayne
> Paris since '97
>
>
>

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Re: MEC with 75 ohm termination [message #87234 is a reply to message #87233]

Tue, 26 June 2007 21:03

Wayne Carson

Messages: 86
Registered: June 2007

Member

Thanks DJ. I agree not to chain and I don't need to at the moment.
Anyone else wanna chime?
Wayne

"DJ" <www.aarrrrggghhh!!!.com> wrote in message news:4681ddc5@linux...
>I used a terminator cap on my MEC outputs and they were happier for it. I
>don't know about the
> BB. You do not want to "chain" your devices if you can help it. Run a
> separate BNC cable to each device you want to clock. Make the cables of
> equal length if possible.
> Deej
>

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Re: MEC with 75 ohm termination [message #87237 is a reply to message #87234]

Tue, 26 June 2007 22:26

JeffH

Messages: 307
Registered: October 2007
Location: Wamic, OR

Senior Member

Wayne Carson wrote:
> Thanks DJ. I agree not to chain and I don't need to at the moment.
> Anyone else wanna chime?
> Wayne
>
I'm completely terminated on all ends.

Jeff

>
> "DJ" <www.aarrrrggghhh!!!.com> wrote in message news:4681ddc5@linux...
>
>>I used a terminator cap on my MEC outputs and they were happier for it. I
>>don't know about the
>>BB. You do not want to "chain" your devices if you can help it. Run a
>>separate BNC cable to each device you want to clock. Make the cables of
>>equal length if possible.
>>Deej
>>
>
>
>

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Re: MEC with 75 ohm termination [message #87239 is a reply to message #87234]

Tue, 26 June 2007 23:05

Neil
Messages: 1645
Registered: April 2006

Senior Member

"Wayne Carson" arson_wayne@msn.com> wrote:
>Thanks DJ. I agree not to chain and I don't need to at the moment.
>Anyone else wanna chime?

Yes, make sure you use true 75-ohm BNC cables, there are also
50-ohm cables out there with BNC connectors out there, and
those will f*ck up your world from a clocking standpoint.

Cables coded RG-58 are 50-ohm, and RG-59's are 75-ohm.

Neil

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Re: MEC with 75 ohm termination [message #87259 is a reply to message #87229]

Wed, 27 June 2007 08:51

Wayne Carson

Messages: 86
Registered: June 2007

Member

Thanks guys,

Are you terminated with a BNC "T" on the input of the MEC? see attached, or
is your termination on the MEC clock out because it is electrically the same
point?
Wayne

Attachment: BNC T termination z.JPG
(Size: 32.65KB, Downloaded 219 times)

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Re: MEC with 75 ohm termination [message #87261 is a reply to message #87259]

Wed, 27 June 2007 09:05

EK Sound

Messages: 939
Registered: June 2005

Senior Member

Terminate the output of the MEC... just to be sure.

David.

Wayne Carson wrote:
> Thanks guys,
>
> Are you terminated with a BNC "T" on the input of the MEC? see attached, or
> is your termination on the MEC clock out because it is electrically the same
> point?
> Wayne
>
>
>
>

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Re: MEC with 75 ohm termination [message #87271 is a reply to message #87261]

Wed, 27 June 2007 10:19

Wayne Carson

Messages: 86
Registered: June 2007

Member

David,

Do you mean terminate both the input with a "T" and the output?
Wayne

"EK Sound" <askme@nospam.com> wrote in message news:46828c00$1@linux...
> Terminate the output of the MEC... just to be sure.
>
> David.
>
> Wayne Carson wrote:
>> Thanks guys,
>>
>> Are you terminated with a BNC "T" on the input of the MEC? see attached,
>> or
>> is your termination on the MEC clock out because it is electrically the
>> same point?
>> Wayne
>>
>>
>>

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Re: MEC with 75 ohm termination [message #87277 is a reply to message #87271]

Wed, 27 June 2007 10:32

EK Sound

Messages: 939
Registered: June 2005

Senior Member

No, just the output. I have never been a fan of using T's in word
clock or video cabling.

David.

Wayne Carson wrote:
> David,
>
> Do you mean terminate both the input with a "T" and the output?
> Wayne
>
>
>
> "EK Sound" <askme@nospam.com> wrote in message news:46828c00$1@linux...
>
>>Terminate the output of the MEC... just to be sure.
>>
>>David.
>>
>>Wayne Carson wrote:
>>
>>>Thanks guys,
>>>
>>>Are you terminated with a BNC "T" on the input of the MEC? see attached,
>>>or
>>>is your termination on the MEC clock out because it is electrically the
>>>same point?
>>>Wayne
>>>
>>>
>>>
>
>

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Re: MEC 75 term ohm test [message #87278 is a reply to message #87229]

Wed, 27 June 2007 10:31

Wayne Carson

Messages: 86
Registered: June 2007

Member

Hi group,

I picked up a 75 ohm termination from Kiesub electronics and I put a meter
to it. It only reads 1 ohm. I thought it was a resister load termination
but is it possible that it is a inductive or capacitive load and therefore
can not be accurately testing with an ohm meter?

Wayne

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Re: MEC with 75 ohm termination [message #87279 is a reply to message #87271]

Wed, 27 June 2007 10:31

Deej [4]

Messages: 1292
Registered: January 2007

Senior Member

Just run a straight feed from the BB to the MEC input. You don't need a "T"
for the MEC input. Use a 75ohm terminator cap on the MEC out.

Deej

"Wayne Carson" <carson_wayne@msn.com> wrote in message
news:46829d99@linux...
> David,
>
> Do you mean terminate both the input with a "T" and the output?
> Wayne
>
>
>
> "EK Sound" <askme@nospam.com> wrote in message news:46828c00$1@linux...
>> Terminate the output of the MEC... just to be sure.
>>
>> David.
>>
>> Wayne Carson wrote:
>>> Thanks guys,
>>>
>>> Are you terminated with a BNC "T" on the input of the MEC? see attached,
>>> or
>>> is your termination on the MEC clock out because it is electrically the
>>> same point?
>>> Wayne
>>>
>>>
>>>
>

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Re: MEC with 75 ohm termination [message #87280 is a reply to message #87277]

Wed, 27 June 2007 10:32

Wayne Carson

Messages: 86
Registered: June 2007

Member

OK . . . cool. You guys are great.
Wayne

"EK Sound" <askme@nospam.com> wrote in message news:4682a071$1@linux...
> No, just the output. I have never been a fan of using T's in word clock
> or video cabling.
>
> David.
>
> Wayne Carson wrote:
>> David,
>>
>> Do you mean terminate both the input with a "T" and the output?
>> Wayne
>>
>>
>>
>> "EK Sound" <askme@nospam.com> wrote in message news:46828c00$1@linux...
>>
>>>Terminate the output of the MEC... just to be sure.
>>>
>>>David.
>>>
>>>Wayne Carson wrote:
>>>
>>>>Thanks guys,
>>>>
>>>>Are you terminated with a BNC "T" on the input of the MEC? see attached,
>>>>or
>>>>is your termination on the MEC clock out because it is electrically the
>>>>same point?
>>>>Wayne
>>>>
>>>>
>>>>
>>

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Re: MEC with 75 ohm termination [message #87282 is a reply to message #87280]

Wed, 27 June 2007 10:37

Deej [4]

Messages: 1292
Registered: January 2007

Senior Member

Sorry................Dave will only be "great" when he gives me his DM 2000.
Until then, he is "very very good"....."pending greatness"........he knows
how to move on to the lext level. It's up to him now.

;o)

"Wayne Carson" <carson_wayne@msn.com> wrote in message
news:4682a0ba@linux...
> OK . . . cool. You guys are great.
> Wayne
>
> "EK Sound" <askme@nospam.com> wrote in message news:4682a071$1@linux...
>> No, just the output. I have never been a fan of using T's in word clock
>> or video cabling.
>>
>> David.
>>
>> Wayne Carson wrote:
>>> David,
>>>
>>> Do you mean terminate both the input with a "T" and the output?
>>> Wayne
>>>
>>>
>>>
>>> "EK Sound" <askme@nospam.com> wrote in message news:46828c00$1@linux...
>>>
>>>>Terminate the output of the MEC... just to be sure.
>>>>
>>>>David.
>>>>
>>>>Wayne Carson wrote:
>>>>
>>>>>Thanks guys,
>>>>>
>>>>>Are you terminated with a BNC "T" on the input of the MEC? see
>>>>>attached, or
>>>>>is your termination on the MEC clock out because it is electrically the
>>>>>same point?
>>>>>Wayne
>>>>>
>>>>>
>>>>>
>>>
>

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