How To Use a Low Noise Amplifier (L.N.A.)

Рет қаралды 1,224

sunwave

5 ай бұрын

Visual and verbal how-to on using an LNA.

Пікірлер: 15

@vineyardsaker6195 7 күн бұрын

thank you, that was most useful!

@dmbworks8094 5 ай бұрын

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.

@billryland6199 Ай бұрын

LNAs are needed at higher frequencies. The natural noise level is high on 80 meters.

@DutchmanRadio 5 ай бұрын

Good stuff sir!

@sunplio 5 ай бұрын

I hope it is simple and easy to grasp for the newbie. Thanks!

@vineyardsaker6195 7 күн бұрын

@@sunplio Since I qualify as a newbie, I also can confirm: that was understandable even for my newbie brain :-)

@nixraff7802 Ай бұрын

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...

@danedewaard8215 5 ай бұрын

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!!!

@sunplio 5 ай бұрын

No passive mode. It's heavily attenuated with no power to lna.

@Robyn.....................254 5 ай бұрын

Hi is it possable to use this on a quansheng?many thanks 🇬🇧

@sunplio 5 ай бұрын

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.

@Ang_Way 4 күн бұрын

do u recommend a bias tee powered lna or a external powered lna?

@sunplio Күн бұрын

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 Күн бұрын

@@sunplio can i use a phone charger to power the lna?

@sunplio 17 сағат бұрын

@@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.