i worked on an LNA housing for boeing satellite systems advanced design team. it had 4 LNA's with 4 mirrored and 8 redundant LNA's. ill never forget all the #0's screws for the waveguide covers haha.
The rf-in and rf-out are not labeled on the housing of the LNA device. The dc connector is on the rf-in side, it should be on the rf-out side. The MMIC amp chip has only *one* uni-directional diode for protection. So in reality you should need two of them antiparallel. Or better: an bi-directional protection. 😇 There are many reports of malfunctions at this type of LNA...
I'm just wondering if the LNA is REALLY in pass-thru mode when not powered??? My RTL-SDR V4 is so sensitive that it does not need the help of an LNA!!!
LNA's are for receivers and won't transmit. You can use it on that HT but if you try to transmit through a LNA you risk burning up the LNA and or radio output finals. You need to have a linear amplifier for the 2m/70cm Quansheng, All of the Quansheng HT's need the operator to have the proper license. Not going to discuss licensing.
External power from a battery bank is quietest. I was demonstrating using the RTL-SDR v4 bias-T. It has satisfactory low enough noise floor at low RF Gains. LNA is there to compensate for that.
@@Ang_Way You can but it might induce switching power supply noise. Better to use a power bank. They last a real long time on the lna because it consumes very little current.
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thank you, that was most useful!
LNAs are needed at higher frequencies. The natural noise level is high on 80 meters.
i worked on an LNA housing for boeing satellite systems advanced design team. it had 4 LNA's with 4 mirrored and 8 redundant LNA's. ill never forget all the #0's screws for the waveguide covers haha.
Good stuff sir!
I hope it is simple and easy to grasp for the newbie. Thanks!
@@sunplio Since I qualify as a newbie, I also can confirm: that was understandable even for my newbie brain :-)
The rf-in and rf-out are not labeled on the housing of the LNA device. The dc connector is on the rf-in side, it should be on the rf-out side.
The MMIC amp chip has only *one* uni-directional diode for protection. So in reality you should need two of them antiparallel. Or better: an bi-directional protection. 😇
There are many reports of malfunctions at this type of LNA...
I'm just wondering if the LNA is REALLY in pass-thru mode when not powered??? My RTL-SDR V4 is so sensitive that it does not need the help of an LNA!!!
No passive mode. It's heavily attenuated with no power to lna.
Hi is it possable to use this on a quansheng?many thanks 🇬🇧
LNA's are for receivers and won't transmit. You can use it on that HT but if you try to transmit through a LNA you risk burning up the LNA and or radio output finals. You need to have a linear amplifier for the 2m/70cm Quansheng, All of the Quansheng HT's need the operator to have the proper license. Not going to discuss licensing.
do u recommend a bias tee powered lna or a external powered lna?
External power from a battery bank is quietest. I was demonstrating using the RTL-SDR v4 bias-T. It has satisfactory low enough noise floor at low RF Gains. LNA is there to compensate for that.
@@sunplio can i use a phone charger to power the lna?
@@Ang_Way You can but it might induce switching power supply noise. Better to use a power bank. They last a real long time on the lna because it consumes very little current.