Transcription
TOROID CORES AND RFC WINDING EASY BITXNoCoil No TypeStageBifilarTrifilarBand MtWire SWGT 1: T37-43BM/PD------8 Turns20/40/8028 SWGT2: T37-43VFO Mixer------8 Turns20/40/8028 SWGT3: T37-43VFO Mixer-------8 Turns20/40/8028 SWGT7: T37-43RF TX Amp10 Turns----------20/40/8028 SWGRFC – 1Ferrite BeadBias Control25 Turns-------------------20/40/8034-36 SWGRFC-2BalunBinocular /T37-43Linear PAFill Balun------------------20/40/8028 SWGT8: T37-43Driver TX8 Turns----------20/40/8028 SWG78T9: T37-43Linear Amp3 Turns----------20 Mt28 SWG8T9: 37-43Linear Amp6 Turns----------40 Mt28 SWG8T9 :27-43Linear Amp8 Turns-----------80 Mt28 SWG1234561
LOW PASS FILTERS FOR 20/40/80 MTLOW PASS FILTER 20 MT 5C76220 PF560 PF220 lver Mica OptionalSilver Mica OptionalSilver Mica OptionalLOW PASS FILTER 40 MT BANDNoL1L2TorroidT50-2T50-2C74430 PF100vDiscSilver Mica OptionalC75C76820 PF430 PF100v100vDiscDiscSilver Mica OptionalSilver Mica Optional2Turns1616SWG# 28#28Inductance1.30uh1.30uh
LOW PASS FILTER 80 MT BANDNoL1L2C74C75C763TorroidT50-2T50-2820 PF1500 nductance2.48uh2.48uhSilver Mica OptionalSilver Mica OptionalSilver Mica Optional
DRAWING BAND PASS FILTER COILS WINDINGKeep Core at Top groove level while winding and taking measurement for coilwind 2 to 3 turns extra, after taking measurement as per table remove extraturns.4
FOR 20/40 COILS USE 36 #SWGFOR 80 MT COILS USE 38 42232234Groove1: Turns5 Pr6Pr10Groove2: Turns5Pr6Pr10Groove3:Turns4Pr6Pr6 Pr 2SecBAND PASS FILTERS FOR 20/40/80 MTBAND PASS FILTER 20 MT koTypePrimary T14 TurnsSecondary T2 TurnsSWG Inductance362 uh14 Turns0 Turns362 uh14 Turns2 Turns362 uh43 PF3 PF Or 2.2 PF43 PF3 PF Or 2.2 PF43 PFDISC NPODISC NPODISC NPODISC NPODISC NPO50V50V50V50V50VGroove 4:Turns2 Sec4 Pr 3 Sec6 Pr Z 2 Sec
BAND PASS FILTER 40 MT oTypePrimary T22 TurnsSecondary T3 TurnsSWG Inductance365 uh22 Turns0 Turns365 uh22 Turns3 Turns365 uh100 PF5.6 PF100 PF5.6 PF100 PFDISC NPODISC NPODISC NPODISC NPODISC NPO50V50V50V50V50VBAND PASS FILTER 80 MT koTypePFPFPFPFPFPrimary TTurns 32Secondary TTurns 4SWG Inductance367 uhTurns 32Turns 0367uhTurns 32Turns 4367uh270 PF22 PF270 PF22 PF270 PFDISC NPODISC NPODISC NPODISC NPODISC NPO50V50V50V50V50V
Note:For builders who may have difficulty in winding band pass filter coils on toko coil,they could buy ready available bpf from qrp labs and mount them on the bitxeasy board relevant section.Linkhttps://www.qrp-labs.com/bpfkit.htmlAn inductance meter would be very useful in calculating the inductance. If you donot have then just follow the number of turns as we have calculated for you.One important point about inductance meters is that there are several onesavailable but very few will give correct reading.If possible try to build a inductance meter from open source design of Vk3BHR.Link tmlWe are using the same design for our test the measurement is just about perfect.7
1 TOROID CORES AND RFC WINDING EASY BITX No Coil No Type Stage Bifilar Trifilar Band Mt Wire SWG 1 T 1: T37-43 BM/PD ----- 8 Turns 20/40/80 28 SWG 2 T2: T37-43 VFO Mixer ----- 8 Turns 20/40/80 28 SWG
