On 3/17/2014 12:21 PM, Jeff wrote:
On 17/03/2014 16:01, Jerry Stuckle wrote:
On 3/17/2014 11:58 AM, Jerry Stuckle wrote:
Then why, pray tell, does the several $K Sencore signal analyzer sitting
on the back shelf (because it's now pretty much obsolete) say "dbm"? It
has been that way since I first started with MATV systems back in the
early 70's. It's so common many cable techs wouldn't know there even is

I can't comment onyour Sencore signal analyzer as I have never used one,
BUT every other signal generator and spectrum analyser I have come
across and used, from HP/Agilent, R&S, MI etc etc when labelled dBm mean
dB relative to a milliwatt. Also every other RF engineer I have come
across universally understands dBm to mean dB relative to a milliwatt
NOT dBmV.

Just check the specs of any rf test gear line you will see that they
refer to dbm meaning dB relative to a milliwatt. Even Sencore's website
with the specs of their latest equipment, Where they mean dBuV or dBmV
they say so.

Jeff

Remember - these are NOT RF engineers - they are only a small subset of
the entire industry. These are cable installers, TV technicians, and
the like.

Even the TV signal generators I used in the 70's and early 80's when I
did some TV work were listed as dbm.

And these guys don't look at websites to use the equipment. They are
given a spec to meet and meet it. They don't know and don't care if
it's dBmV or dBmW.

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Jerry Stuckle

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