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File:M0YDH Upconverter.jpg (1,008 × 567 (210 KB)) - 12:49, 12 August 2022File:P2020 M0YDH 01.jpg (3,148 × 2,203 (620 KB)) - 12:50, 12 August 2022File:P2020 M0YDH 02.jpg (1,008 × 567 (196 KB)) - 12:52, 12 August 2022File:P2020 M0YDH 03.jpg (865 × 554 (185 KB)) - 12:53, 12 August 2022File:P2020 M0YDH 04.jpg (792 × 567 (143 KB)) - 12:55, 12 August 2022File:20190413 M0YDH (Small).jpg (640 × 480 (59 KB)) - 20:29, 13 April 2019File:M0YDH TERRESTRIAL RX MENU.jpg Terrestrial Rx menu - Portsdown 2019 by M0YDH(1,008 × 567 (173 KB)) - 20:20, 17 September 2019File:M0YDH QO-100 Rx menu.jpg QO-100 Rx Menu -Portsdown 2019 by M0YDH(1,008 × 567 (158 KB)) - 20:14, 17 September 2019
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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 2019File:20190413 180639 (Small).jpg A Portsdown 2019 transmitter by M0YDH(480 × 640 (120 KB)) - 20:26, 13 April 2019File:20190413 163955 (Small).jpg Rear Panel - Portsdown 2019 by M0YDH(606 × 480 (98 KB)) - 20:31, 13 April 2019File:20190201 182818-1008x756.jpg Underside of V2.3 8 band RF switch - M0YDH(1,008 × 756 (182 KB)) - 12:41, 2 February 2019File:M0YDH TERRESTRIAL RX MENU.jpg Terrestrial Rx menu - Portsdown 2019 by M0YDH(1,008 × 567 (173 KB)) - 20:20, 17 September 2019File:20190201 182759-1008x756.jpg 8 Band RF Switch V2.3 assembled by M0YDH(1,008 × 756 (196 KB)) - 12:40, 2 February 2019File:M0YDH QO-100 Rx menu.jpg QO-100 Rx Menu -Portsdown 2019 by M0YDH(1,008 × 567 (158 KB)) - 20:14, 17 September 2019File:20190413 164004 (Small).jpg A Portdown 2019 Transmitter by M0YDH - 8 way RF switch(640 × 480 (143 KB)) - 20:27, 13 April 2019File:4m LPF.jpg G4GUO 4m low pass filter design built by David M0YDH(2,048 × 1,152 (704 KB)) - 18:37, 13 January 2020File:1255 Interdigital filter 1.jpg M0YDH build of W6PQL filter in a die cast box(567 × 1,008 (253 KB)) - 13:29, 20 June 2021File:1255 Interdigital filter 2.jpg M0YDH build of W6PQL filter in a die cast box(907 × 1,612 (294 KB)) - 13:30, 20 June 2021File: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 2021File: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 2017File: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 2017File: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