Love the little capacitor on the power input---great idea! Gives something to grab like you said, that won't just bend all over the place as would single leads, and also gives some extra filtering 🙂
I buillt a MAR 6 board like that as a booster stage for a shielded receiving loop. I saw what the OEM development boards cost and freehanded a PCB that looks similar. However the bias resistor was replaced with a pot because they call out 1% resistors for a list of power supply voltages. I used a 9V battery and set the drain to the 14 mA called for in the specs. Does the job. Noise figure is low at several GHz so I figured HF might be same or even better. Gain is plenty for the job.
I wonder why the MAV-11/MSA1104/5 type MMICs have a substantial gain increase (6 dBish) at low frequencies, vs the flat LF response of most other MMICs..?
i remember having 2 of very similar devices inside of a tv antena amplifier board in my first grid amplified compact antena around 30 years ago could those be those ic's? i remember distinct shape and 4 flat leads and also the ic's were mounted in a hole in the pcb
Maybe. The way those MMIC's connect up looks very similar to a regular RF capable NPN transistor. The MMIC's here are designed to self bias and have a very carefully designed amplification.
Nice demonstration and result. I've become familiar with measurements shown, now working on audio signals too. Is the noise factor calculation something which would be done on a one- stage amplifier?
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Love the little capacitor on the power input---great idea! Gives something to grab like you said, that won't just bend all over the place as would single leads, and also gives some extra filtering 🙂
I buillt a MAR 6 board like that as a booster stage for a shielded receiving loop. I saw what the OEM development boards cost and freehanded a PCB that looks similar. However the bias resistor was replaced with a pot because they call out 1% resistors for a list of power supply voltages. I used a 9V battery and set the drain to the 14 mA called for in the specs. Does the job. Noise figure is low at several GHz so I figured HF might be same or even better. Gain is plenty for the job.
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...and I made a typo :-(
More fun with RF!!
I wonder why the MAV-11/MSA1104/5 type MMICs have a substantial gain increase (6 dBish) at low frequencies, vs the flat LF response of most other MMICs..?
I'd probably drill a hole for the MMIC. But the first thing I'd do after soldering is remove the flux.
i remember having 2 of very similar devices inside of a tv antena amplifier board in my first grid amplified compact antena around 30 years ago
could those be those ic's? i remember distinct shape and 4 flat leads and also the ic's were mounted in a hole in the pcb
Maybe. The way those MMIC's connect up looks very similar to a regular RF capable NPN transistor. The MMIC's here are designed to self bias and have a very carefully designed amplification.
I'd be interested in the same measurements after cleaning the solder flux.
Nice demonstration and result. I've become familiar with measurements shown, now working on audio signals too.
Is the noise factor calculation something which would be done on a one- stage amplifier?
Perfect
MAR 6 calls out 2.6 NF I recall.
Brain disturbance
Looks choppy, could be oscillating at ~80ghz.
Gain is dB, power level is dBm, just an old farth with no clue
R U having a stroke?