J310 push-pull HF pre-amp complete DIY KIT 0.03-30 MHZ - SV1AFN shop

Description

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Here is a complete set of all parts together with a double-sided gold plated PCB to build a push-pull class-a J310 low noise amplifier.
New ears for your HF receiver
The design is successfully tested with around 15 dB gain from 0.5 to 30 MHZ and still has 8-10 dB gain on more than 55MHZ.
The outupt P1dB is +15dBm and it's noise figure is around 3 dB.
This amplifier can be used as a low-noise pre-amplifier in receivers or as general purpose wideband gain stage.
The two J310 J-Fets are biased at about 20mA each. The input transformer T1splits the input signal to feed both of the J-FETS in a balanced configuration, while T2 adds the two amplified signal together. This technique improves the 2nd order performance significantly, since all even harmonics cancel out. R1 and L1 form a negative feedback which affects amplifier's gain and frequency response.
This listing is for one PCB plus all necessary components together with the SMA connectors.
The item (1 complete KIT as described) will be shipped with Registered priority air mail or withFedEx.
You can download its schematic and building instructions from our website sv1afn
User Comments:
Hello
I just want to let you know how pleased I am with your preamp that you modified for the LF bands. It works very well, very clean with no images. The previous preamp I was using was a Hewlett Packard and it created a lot of images down the band. I am able to receive LW stations from Europe and I live 1500km from the Canadian coast. Very impressive preamp.
Terry VE3XTM
Guelph ON
Canada
.
Check out my
other items
! I always combine shipping.
This peamp is also available as a completely built & tested PCB module, see it here:
https://www.ebay.com/itm/201976976000