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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

Very nice shape, nice experiment too. Like to mentioned, matching is important. I wonder how the shape looks when it is part of the BITX but I am sure you will add it. Chris. the experiments. the

Hi fellow BITX-ers, About one or two months ago I promised to report of my ladder filter experiment on 9MHz. I just dropped the files with shape-pictures in the Files box. See the folder "Ladder

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 : /Ladder Crystal Filter Design /X-tal 9 MHz.xls

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_B.zip Uploaded by : eternalesquire

Rob, I just compared the emitter circuits with the originals. Yup, you called it. I will fix this and put this out in Rev B asap. The Eternal Squire

Hi Arv & Ron, It appears that the bidirectional amplifiers cannot be biased correctly, with those 100 nf in series with the emitters. I haven't looked, but I suspect they are in parallel with the

Hi, Another piece of useful advice re VFO tuning. I have found that coupling the VFO capacitor to the load side of a plastic planetary gear drive kit (used in toy boats and aircraft) provides a

Hi, All the graphic formats are supported here, those are no problem. I specifically do not run the "MS Office Suite" as they are klunky and slow never minding a security issue. Got the files and

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 : /KB1GMX/PIN-ATT1.jpg Uploaded by : ajparent1

I have put the revised gifs out at http://www.ham-stuff.net/w5rcm/BITX/ for those who want them. Squire, I've got no problem if you want to roll these up into your zip file. Go for it! -- 72, Ron -

Hi, I'm sending my response as a group letter. I just recently uploaded a new .ZIP with the A revision of the engineering diagrams, as EGR\BITX_rev_A Allison, I meant to say that the format is

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_A.zip Uploaded by : eternalesquire