https://forum.microwaves101.com/categories/5/communications/feed.rss Sat, 17 Oct 2026 21:44:58 Z Communications - Microwaves 101 Discussion Board en https://forum.microwaves101.com/discussion/147/heating-problem-waveguide-wr-1800-to-coaxial-adapter Sat, 31 Oct 2020 17:56:29 Z Nashat 147@/discussions Dear Colleagues, I have a heating problem in a waveguide -to coaxial, transition the temperature exceeds 75 c degree, while the other rf station temperature in 37 c degree, do you any idea what is wrong? I have attached ppt file show the waveguide transition and the thermal image shows the... https://forum.microwaves101.com/discussion/58/beyond-maximum-stable-gain-of-an-rf-transistor Mon, 16 Mar 2020 19:36:56 Z Thomas Lancaster 58@/discussions I was plotting constant-gain circles on the Smith chart the other day for a potentially unstable RF transistor. I recently read on-line at the link below, that for a potentially unstable transistor the maximum gain that can achieved is the MSG or maximum stable gain. MSG is simply the ratio of the... https://forum.microwaves101.com/discussion/104/wave-guide-wr-08 Sun, 15 Mar 2020 12:49:44 Z Paul 104@/discussions hi all I am looking for a small amount of wave guide WR 08 and flanges not made up for a home project at 140 Ghz but also interested in slightly larger quantities for the amateur radio market possibly in lengths of 1 ft and 10 to 100 flanges https://forum.microwaves101.com/discussion/97/100-ghz-te12-mode-exciters Sun, 27 Oct 2019 09:34:41 Z Paul 97@/discussions Hi all new to posting on this site but wondering if any one could tell me about The following 2 items I have as they clam to be 100 ghz TE12 Mode Exciters made by Furukawa Japan The feeds are WR08 but had reducers on from WR10 The inside diameter of the round wave guide is 9.76 mm When I got the... https://forum.microwaves101.com/discussion/91/hec11-to-tem-mode Sat, 26 Oct 2019 16:06:04 Z Joe 91@/discussions I've learned that it is common to use elliptical waveguide in microwave backhaul connections which are HEc11 mode dominant. If the TEM mode is used in coaxial transmission lines why do we use elliptical waveguide if it does not allow the TEM mode to propagate. I understand that the elliptical... https://forum.microwaves101.com/discussion/56/gain-equations-for-rf-transistors Tue, 16 Oct 2018 05:18:09 Z Thomas Lancaster 56@/discussions G_MAX=(1/(K+√(K^2-1)))*(S_21/S_12 ) B_1=1+|S_11|^2-|S_22|^2-|D_s|^2 MAG=log10(S_21/S_12 )+log10(K_-^+ √(K^2-1)) Hello everyone, I came across Microwaves 101.com the other day and this relatively new gain equation for unconditionally stable transistors(GMAX,top equation above). The equation was in...