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?
@@nicholasp8978 nope. SDRPlay devs and SDR# devs don't get along. All the crybabies that whine about closed software were told to take a hike down their snowflake trail.
@@sparky71a no offset. It uses a ring mixer oscillator on the R828D chip. I am astonished that some actually think this particular dongle needs an offset set in software. Not the case. Only offset there is is PPM correction. You shouldn't need any offset. Keep it in quadrature sampling. No Q branch. It is not like v3 dongle. Straight tuning 24MHz and lower.
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.
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.
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.
-Even if two wires are same length it's still a random length on 1:9 baluns. on 1:1 baluns it's a dipole. -1:1 baluns reception is best for frequencies wire is cut for. Reception sucks outside of it's bandwidth. -For general coverage use 1:9 baluns.
You mean how dare someone use the privileges of their license to prove a point. No one owns a frequency, even if they have a net scheduled or have think they have net running 24/7 on that frequency.
