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...P Labs 4m and 2m LPF.jpg|300px|Low pass filter kits from QRP-Labs built by M0YDH for Portsdown TX use. 4m on left and 2m on right ]] [[File:4m_LPF.jpg|400px|G4GUO filter built by David M0YDH]]

| 27 || M0YDH (/P) || 30 | 9 || M0YDH (/P) || 10 || G7MEG || IO82WO || 5

Example of the design built by M0YDH with help from G8GTZ who formed the coupling capacitor between sections fro [[File:20170914 CQTV250 2m BPF M0YDH.jpg|400px| ]] [[File:t.jpg|500px]]

Example made by M0YDH (using capacitors found in the Finningley ARS scrap heap during CAT17!). Th Pictures of the 5 pole version made by David M0YDH. Cables and coupler only measured at -9.75dBm indicating an inserion loss o

[https://youtu.be/D9r-Zb_YhsU A video of an upconverter in action by David M0YDH is here.] THis picture shows a later upconverter system built by M0YDH. Clockwise from bottom right:- 12V in and 5V regulated supply // BATC PIC c

...have been used with Molex KK connectors for the wiring. Pictures are from M0YDH. [[File:P2020 M0YDH 03.jpg|600px]] [[File:P2020 M0YDH 04.jpg|600px]]

...EBay £9 tripod ( with its 1/4" UNC mounting thread) to finish the project (M0YDH)]] ...dh1.jpeg|380px|thumb|right|The video source shown fitted in a diecast box (M0YDH)]]

...eSDR Mini use, and the underside showing the wire link. Assembled by David M0YDH

...CKIT3_FITTED_TO_PROJECT_BOARD.jpg|200px]] Direct connection worked well at M0YDH.

David M0YDH shows Ian's design in operation:- [http://youtu.be/u4AeW-bPYxo G8ADE RELAY

....com/watch?v=GzZPBaIANwE First power tests with Lime Mini SDR Portsdown at M0YDH]

| M0YDH || David || 1.1 || Dual Patch || 100 || EN DE FR Welsh || Portsdown 4 + Plu