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Thursday, 23 August 2018

LF TX

As coming into the winter months again and LF is dominating for a while going to improve the LF options a bit.

I had  used an IRF510 based PA based on http://www.gw3uep.ukfsn.org/25W_QTX/472_25W_QTX/472_kHz_25W_PA.htm with one of G3YXM/G0MRF's  transmitters. I had played with transverters using  10MHz/30m and not the more usual 10m/30MHz. Antenna was an inverted L.

The bench certainly had a Graham VK3XDK 472KHz transverter for KX3  completed but not in an enclosure so I will have to pull it all together again and finish it off.

I note previously I had used 22mm or 25mm, http://m1kta-qrp.blogspot.com/2013/02/472khz-25w-pa.html cannot remember which, white PVC conduits as the LPF coil foms. I see there are some nice 3D printed LPF coil forms for 472KHz available so will try to source the STL files and take a look.


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