Improving the MLA-30

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Andrew (grayhat)
Posts: 280
Joined: Sat May 28, 2022 5:56 am
Location: JN63pn

Improving the MLA-30

Post by Andrew (grayhat) »

Here are some suggestions, in case you decided to buy it, that is :)

First step, improve the loop; either use some copper pipe or alumium strip to make a wider and BIGGER loop (easy)

Second step; match the impedance, the preamp has an impedance ranging from 1.5K down to 450Ohm, now ler's find a balance, break the loop at top and use a 975Ohm resistor to connect the two halves

Third step: the preamp to bias tee coax sucks badly, add a BNC connector to the preamp box and use a run of decent coax (RG6 will do) to feed the loop

Fourth step: the BIAS Tee unit was designed by a drunk folk, replace it asap
Egil - LA2PJ
Posts: 12
Joined: Thu Jun 09, 2022 11:07 am

Re: Improving the MLA-30

Post by Egil - LA2PJ »

Never used a MLA-30 myself, but today I more or less stumbled over this discussion where they also have published schematics for both loop amplifier and bias-T:

https://www.eevblog.com/forum/rf-microw ... p-antenna/


Good luck!
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Andrew (grayhat)
Posts: 280
Joined: Sat May 28, 2022 5:56 am
Location: JN63pn

Re: Improving the MLA-30

Post by Andrew (grayhat) »

Yep Egil, know that, all in all I wrote that post :D
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