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wrote: Ok, just curious. Either those are very poor quality versions of MPS2222 (defective lot?) or something is very wrong. Could it be measurement error? That works well you unless you use really

All, Here is the new archive for BITX20 Engineering diagrams. I have reposted a new archive, EGR\BITX_REV_C, containing all the corrections for Revision B diagrams, plus GIF translations done by

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /EGR/BITX_rev_C.zip Uploaded by : eternalesquire

Allison, No, I intend this to be used as 20M. I just use a colorburst crystal oscillator for signal tracing, and I used a scope to compare the incoming and outgoing signals to measure gain. I wired

Hi, Orange, pink and purple/violet are common to 10.7 IF coils. Allison KB1GMX

For calculate resonant frecuency in used TOKO or FI cans can be used a practical old know formulae: F(MHz)= sqrt(25330/(L(uH) * C(pF))) or L(uH)=25330/(F*F(MHz) * C(pF)) or C(pF)=25330/(F*F(MHz)

wrote: They are in 10,7MHz: orange 1? IF 10,7 (This is the can to be used in BITX) (100pF capacitor in parallel) green 2? IF 10,7(uncommun) (100pF capacitor in parallel) pink

Does anyone know the colour code for TOKO 10.7 Mhz printed citcuit transformers? Which are the IF , oscillator and dicriminator colours? Jim VE3DDY

Inline and edited. wrote: This is very low gain. The expected should be far higher in the order of of around 16DB. I would expect to see around 100mv for 3mv in. I'm curious why 3.579nmhz? IS

Hello, Two weeks I finished my experiment with the 9MHz crystal filter design and reported the results of it in several files in the File-box Ladder Crystal Filter Design. I dropped a message in

All, Thanks for the info re crystals, it will come in handy when I am ready. Next question: I have now finished building the first bidirectional amplifier after the preselector. I injected a 3 mV

All, Thanks for the info re crystals, it will come in handy when I am ready. Next question: I have now finished building the first bidirectional amplifier after the preselector. I injected a 3 mV

My comments at bottom. of the required BW. However I try to keep it within 100hz for SSB filters. all available with me. Select ones within 100hz of each other . Take the lowest one for carrier osc

Hi! Some one once mentioned , thumbrule for xtal matching was within 10% of the required BW. However I try to keep it within 100hz for SSB filters. Till date all appear to have worked fine. 73

Hello, Experience and also literature suggests less than 100hz for SSB bandwidth (2.2-2.8khz) and less than 1/10th the bandwidth or >30hz for CW filters (200hz to 800hz bandwidth). Practical filters

Hi, Have a look at messages 124 and 131. I found a set of 4 crystals within 30 Hz and they are doing fine for SSB. I have posted a plot of the resulting filter passband in the files section. Look

Hi, I never saw anything about the original article about this. I've used the BFO and a frequency counter to measure all my crystals. How closely do they need to be matched for SSB reception? for

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /BITX 15 + PLL/MULTIBAND_BITX_B1.PDF Uploaded by

Hello, I just dropped the schema how I measured the curves of the ladderfilter in the Files box, folder: "Ladder Crystal Filter Design". One is in GIF the other one is in SPL. The last one can be

Hi Chris, Thanks for your comment. When the filter is part of the new BITX80/20 I will have to match the filter in the trcvr again. With you I wonder how it will be, special because the filter is