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  • File:20190413 180629 (Small).jpg
    Portsdown 2019 with 3.5" screen by M0YDH
    (480 × 640 (104 KB)) - 20:22, 13 April 2019
  • File:20190413 180639 (Small).jpg
    A Portsdown 2019 transmitter by M0YDH
    (480 × 640 (120 KB)) - 20:26, 13 April 2019
  • File:20190413 163955 (Small).jpg
    Rear Panel - Portsdown 2019 by M0YDH
    (606 × 480 (98 KB)) - 20:31, 13 April 2019
  • File:M0YDH TERRESTRIAL RX MENU.jpg
    Terrestrial Rx menu - Portsdown 2019 by M0YDH
    (1,008 × 567 (173 KB)) - 20:20, 17 September 2019
  • File:20190201 182759-1008x756.jpg
    8 Band RF Switch V2.3 assembled by M0YDH
    (1,008 × 756 (196 KB)) - 12:40, 2 February 2019
  • File:20190201 182818-1008x756.jpg
    Underside of V2.3 8 band RF switch - M0YDH
    (1,008 × 756 (182 KB)) - 12:41, 2 February 2019
  • File:M0YDH QO-100 Rx menu.jpg
    QO-100 Rx Menu -Portsdown 2019 by M0YDH
    (1,008 × 567 (158 KB)) - 20:14, 17 September 2019
  • File:20190413 164004 (Small).jpg
    A Portdown 2019 Transmitter by M0YDH - 8 way RF switch
    (640 × 480 (143 KB)) - 20:27, 13 April 2019
  • File:4m LPF.jpg
    G4GUO 4m low pass filter design built by David M0YDH
    (2,048 × 1,152 (704 KB)) - 18:37, 13 January 2020
  • File:1255 Interdigital filter 1.jpg
    M0YDH build of W6PQL filter in a die cast box
    (567 × 1,008 (253 KB)) - 13:29, 20 June 2021
  • File:1255 Interdigital filter 2.jpg
    M0YDH build of W6PQL filter in a die cast box
    (907 × 1,612 (294 KB)) - 13:30, 20 June 2021
  • File:1255 Interdigital filter 3.jpg
    M0YDH build of W6PQL filter in a die cast box. Cables and coupler only were at -9
    (1,025 × 887 (229 KB)) - 13:31, 20 June 2021
  • File:20170914 QRP Labs 4m and 2m LPF.jpg
    Low pass filter kits from QRP-Labs built by M0YDH for Portsdown TX use. 4m on left and 2m on right
    (3,198 × 1,756 (114 KB)) - 18:38, 14 September 2017
  • File:20170914 CQTV250 2m BPF M0YDH.jpg
    2m Band Pass filter built by David M0YDH to the instructions in CQTV250. Red coupling wire by Noel G8GTZ at CAT17 wo
    (3,461 × 2,779 (216 KB)) - 18:27, 14 September 2017
  • File:Mini-kits amp pcb on Pentium P4 style heatsink and fan.jpg
    437 MHz amplifier is shown nearing end of construction at M0YDH. Mini-kits UHF amp kit is mounted on the ex-computer heat sink. Their low-p
    (3,124 × 2,707 (296 KB)) - 19:58, 16 November 2019
  • 70MHz filters
    ...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]]
    2 KB (298 words) - 17:22, 17 April 2021
  • IARU ATV contest 2018 Results
    | 27 || M0YDH (/P) || 30 | 9 || M0YDH (/P) || 10 || G7MEG || IO82WO || 5
    6 KB (920 words) - 14:24, 12 September 2018
  • 146 MHz filters
    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]]
    2 KB (359 words) - 17:32, 17 April 2021
  • 23cms filters
    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
    3 KB (566 words) - 11:55, 26 June 2021
  • 71 MHz
    [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
    7 KB (1,181 words) - 19:24, 9 September 2022

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