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CJay:

--- Quote from: Neomys Sapiens on March 09, 2019, 10:04:57 pm ---Now this 'Modulation Meter' makes sense to me. Opposed to, for example, the Marconi  TF 2304. How can a modulation meter be a untuned instrument? Modulation of what? Or is it supposed to be fed with one signal only, like a transmitter monitor? But for FM, it must still be told somehow where the carrier is!

--- End quote ---

Have a read of the Sayrosa 257 manual, it explains it all but those meters will lock to the strongest local signal up to 2 ish GHz and they are pretty damn accurate

Neomys Sapiens:

--- Quote from: CJay on March 14, 2019, 12:14:45 pm ---
--- Quote from: Neomys Sapiens on March 09, 2019, 10:04:57 pm ---Now this 'Modulation Meter' makes sense to me. Opposed to, for example, the Marconi  TF 2304. How can a modulation meter be a untuned instrument? Modulation of what? Or is it supposed to be fed with one signal only, like a transmitter monitor? But for FM, it must still be told somehow where the carrier is!

--- End quote ---

Have a read of the Sayrosa 257 manual, it explains it all but those meters will lock to the strongest local signal up to 2 ish GHz and they are pretty damn accurate

--- End quote ---
In the specs of this instrument it is pointed out far more clearly. For example, the lock indicator and the 10dB requirement. The Marconi does not have a (visible) lock indicator, so nothing led me to think that it might lock. So it's akin to the Interceptor with precise measurement. Nice.
Aaaarghh, what have you done? It's well known that I suffer from TEA!

CJay:

--- Quote from: Neomys Sapiens on March 14, 2019, 10:17:27 pm ---
--- Quote from: CJay on March 14, 2019, 12:14:45 pm ---
--- Quote from: Neomys Sapiens on March 09, 2019, 10:04:57 pm ---Now this 'Modulation Meter' makes sense to me. Opposed to, for example, the Marconi  TF 2304. How can a modulation meter be a untuned instrument? Modulation of what? Or is it supposed to be fed with one signal only, like a transmitter monitor? But for FM, it must still be told somehow where the carrier is!

--- End quote ---

Have a read of the Sayrosa 257 manual, it explains it all but those meters will lock to the strongest local signal up to 2 ish GHz and they are pretty damn accurate

--- End quote ---

In the specs of this instrument it is pointed out far more clearly. For example, the lock indicator and the 10dB requirement. The Marconi does not have a (visible) lock indicator, so nothing led me to think that it might lock. So it's akin to the Interceptor with precise measurement. Nice.
Aaaarghh, what have you done? It's well known that I suffer from TEA!

--- End quote ---

Yeah, sorry, not sorry.

There's a Sayrosa 257 under my bench, lovely piece of kit, which agrees very closely with the modulation analysis functions of my CMU200 for FM, it's got the extra feature of being able to deal with AM, If you've a need for modulation measurement then it's a very nice piece of kit.

PaulAm:
Picked up an HP 8754A VNA for around $100, then found a 8501a normalizer for $35.  The dang test set cost as much as those two pieces.

Everything appears to work, although there's a little vertical instability in the display I have to track down.  Have a few more RF bits to track down to get it properly set up.

Have an RF project coming up and needed a VNA but couldn't afford 2K+ for a more modern instrument.  Without the normalizer you're supposed to mark the reference trace on the graticle with a grease pencil  :-DD

velik_kazakov:
In last month I grab a Fluke 5440 for 150 GBP +30GBP shipping. Now it is on my desk repaired and working. Wait to receive Fluke 845 (ordered for 50GBP) in few days.

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