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.
can you comment on why LNA is not good with the sdrPlays... i understood what you said about lower gain increases noise.. just asking for further explanation... does the sdrPlay rsp1b have an internal amp or something?
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!!!
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.
@@nol_yaw 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.
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.
