SIMPLE & ACCURATE HOME MADE SWR METER

[@bill-2018]

I made a resistive SWR meter for QRP. Calibrated with known resistors of 50 Ω, 100 Ω and 200 Ω and so on. I like it because it will not allow the tx to see above 2:1 SWR but will indicate the actual SWR. A 1 mA meter is fine for 5 Watts for a little over fsd and potentiometer to reduce it to fsd. I used a diecast aluminium box spray painted black. G4GHB

[@gendhengiradio]

Yes, the resistive bridge is the savest and most accurate swr meter. Could be better than expensive swr meter.

[@bill-2018]

@@gendhengiradio It's good to 50 MHz, I don't know about 70 MHz but no use at 2m.

[@paul.alarner6410]

why test using ssb,surly cw am of fm would be better?

[@garrybrewster5821]

why is it me, I see transmission line feed-through' T2 connected to earth/ground, this is in all images, maybe I don't understand inductance values, should this be a passive circuit ? could you help me learn a little more ?

[@paul.alarner6410]

is one torroid wound clockwise and the other counter clockwise or both in the same direction?.

[@gendhengiradio]

See picture start at 0:25. The answer is one toroid is clockwise the 2nd toroid is counter clockwise. Look at the picture orange wire : start arrow, turn 10x arrow & end arrow. I draw the toroid & wire in three dimension. Good luck 🤞

[@MrDenomo]

Sy pake itu cuman di modif coupler dan beberapa tambahan/ pergantian komponen hasilnya akurat.

[@m.neztaalfarezy2159]

Om kalo buat 40 m 80 m bisa kah?

[@gendhengiradio]

Bisa

[@SureshKumar-nk2ok]

Sir at which frequency it works

[@gendhengiradio]

At HF but never try it on VHF

[@SergiuCosminViorel]

@@gendhengiradio if you burn a PC Network card terminal, and recuperate those small toroids, aren't those good for VHF ? and if they work on VHF, or just on HF, it does not matter, for this second question, as they are small, can be avoided saturation? in what limits of power can they be used?

[@ssmbssmbssmb]

200 Watt ( see video minute 1:37 ) but only in few seconds

[@singgihsusilo8146]

Kalau di VHF gimana om, masih sama performanya?

[@gendhengiradio]

Maaf, saya gak punya pesawat VHF jadi belum teruji.

[@singgihsusilo8146]

@@gendhengiradio saya punya swr yg sama om cuma sy pake radio vhf

[@rebyekkjersey387]

maksimal bisa berapa watt mas @Gendhengi Radio

[@gendhengiradio]

Untuk QRP Maximum sekitar 100 Watt, tapi sejenak saja dan beri waktu rehat 30 sd 60 detik sebelum tx lagi. Supaya core toroid tidak jenuh dan panas.

[@rebyekkjersey387]

@@gendhengiradio kalau untuk kabel coax nya itu pakai ukuran berapa mas????sepertinya yg difideo bukan rg58???apakah kalai pakai rg58 bisa??

[@gendhengiradio]

@@rebyekkjersey387 Cari yang Z = 50 Ohm

[@rebyekkjersey387]

@@gendhengiradio mau tanya lagi om soale saya mau modif spti di video tapi banyak yg saya blm tau?? 1..untuk ukuran kawat email yg dililit 10x ke binocular ferit itu berapa mm? 2..untuk ukuran binocular ferit sendiri pakai yg ukuran berapa?? 3.trus sama saklar pemindah swr dan power dari bawaan swr maldol kan engak dipakai berati itu pengukuran langsung ya mas ,,jadi menunjukkan swr dan power secara bersamaan???tidak dikalibrasi kalo seperti pakai maldol pada umumnya terima kasih mas sebelumnya ...maaf banyak nanya ini

[@gendhengiradio]

@@rebyekkjersey387 1. Kawat sekitar 0.3mm atau 0.2mm 2. Binocular bekas balun antena TV, atau material no. 43. Jika toroid beli yang asli tipe FT50-43 3. Saklar tidak dipakai, indicator meteran yang kanan untuk menunjukkan SWR, yang kiri defleksi jarum distel maximum saat transmit dengan modulasi suara atau CW ( lihat video ). Hanya bisa menunjukkan power relatif saja.

[@SergiuCosminViorel]

the binocular variant is not "accurate".

[@ssmbssmbssmb]

Toroids are FT37 types. The binoculars are from TV antenna balun.