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Notification: Amateur Round table tomorrow 8PM Central Time (02:00UTC Wed), interview with Ashhar Farhan.
@All
Tom Medlin (W5KUB) requested me to inform you regarding following broadcast. Tomorrow evening Amateur Radio Roundtable W5KUB, interview with Ashhar Farhan, VU2ESE
8 PM Central time Tues night ( for international it is 0200 UTC Wed) With regards, Ron - PA3FAT |
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Re: troubleshooting the bitx40 receiver
Send an email to
??hfsignals at gmail dot com (If I spell out the email address properly, then Yahoo will mangle it.) State what you got, and what you need. That $14 is below their cost, just to get everybody on the same page. So is only available to previous customers. Jerry, KE7ER ---In BITX20@..., <obeebe@...> wrote : That sounds great :) How do I order the Raduino's??? |
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Re: Sad reality of stock vfo
Baruch Atta
I have conquered the drift issue with NP0 caps in the vfo.? If you send me a sase I will send a set to you. 73 Joe w3ttt On Dec 31, 2016 10:12 PM, "Thomas Noel tnoel@... [BITX20]" <BITX20@...> wrote:
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hello - new to BITX
Hello folks,
I only discovered the BITX a few days ago and joined the group. Yesterday I thought I'd have a go at bread-boarding one for 60m - so far the Rx is working well. Ugly pictures here: http://www.karinya.net/g3txq/temp/bitx/bitx1.jpg
? http://www.karinya.net/g3txq/temp/bitx/bitx2.jpg I'm using a 10.7MHz crystal filter and a Microcircuits mixer left over from another project. I've made the band-pass filter plug-in so that I can experiment with other bands. I'm using high-side local oscillator injection - that produces a side-band inversion, so the carrier oscillator has to be on the high side of the filter. The local oscillator is provided from an Arduino breadboard, using an AdaFruit Si5351 break-out board, rotary encoder and LCD display. A happy and peaceful 2017 to everyone, Steve (G3TXQ)
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Re: VFO tuning pot
I just try it see if it works the way you want and then switch it if it doesn't, and when it's right make the connections solid and permanent. Other wise it's too hard for me to follow the written description: did they mount the lugs at the top or at the bottom, does he mean the one on the left looking at it from the front or from the back where you are doing the soldering...
Could be just me... JT aa1of |
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Re: 3d printable enclosures?
I'd
be interested in an enclosure for portable use, specifically for things
like SOTA and backpacking. ?I'll have to wait until mine arrives to
work out the specs, but something a bit more compact and weather
resistant would be ideal. ?Not sure what kind of openings I'll want to
put on it yet, though I'm already planning to change the display to OLED
for cold weather use and play with the firmware to open up other modes,
bands, and features so we'll see what's needed for buttons and knobs.
?Space for an internal battery would be nice, but we'll see how much
extra room that would require.
Cheers, John VA7JBE |
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Re: VFO tuning pot
You still didn't answer the question.? Which lug does the red wire connect to so that the VFO freq
increases when you turn it clockwise.? Before I can trim or look for anything I need to know which way to turn the knob.? There are hardly any signals to work it out and the wiring up description says ???? Solder the red wire of the 3-pin connector to right lug of the tuning control ???? Solder the brown wire of the 3-pin connector to the middle lug of the tuning control ???? Solder the black wire of the 3-pin connector to the right lug of the tuning control and in the photo it shows the red wire connected to the right lug!!! |
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Re: And so, my first two QSL Cards of the year go out for BitX40 QSO's...
The rotating ?dipole is two ham sticks mounted horizontally one attached to the center lead the other the braided of the coax
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Re: And so, my first two QSL Cards of the year go out for BitX40 QSO's...
I'd use Danny Horvat's?EFHW-4010-1K (google it).
That and a 31 foot jacktite pole would be a lot less trouble than a 40m rotating beam, and less likely to catch the attention of neighbors. ?There are plenty of other end-fed-half-wave antennas out there, but this one hits 40,20,15,10 without a tuner, and can deal with a fair bit of power. ?The 80 meter version is twice as long, and more than twice as as likely to extend into somebody else's campsite. ?Though if you do have a spot big enough for 1/2 wave at 80m, you could add more wire to the far end of the EFHW-4010-1K. ? Have a chunk of PVC pipe permanently mounted to a corner of that motorhome to gain a few more feet, and just slip the jacktite down into the top of it when parked. Ashhar has suggested there will be easy mods for the Bitx40 to hit other bands. ---In BITX20@..., <xlthompson@...> wrote : What are you using for an antenna. I am just starting out and wondering about a rotating ?dipole ,I travel in a motorhome sometimes and thought it might be easier to put up. |
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Re: troubleshooting the bitx40 receiver
Don't have one, but I'm convinced the Raduino will fix your drift issue. ?In addition to the Arduino Nano, you get an Si5351 and a display. ?The Raduino is being offered as an upgrade to those with the older Bitx40's?for $14 USD,?which is a very good deal.? I'm expecting much of the future activity in this group to be all about modifications?that involve the Raduino. ?It promises to make the Bitx40 a very flexible development platform. Jerry, KE7ER ---In BITX20@..., <obeebe@...> wrote : ?> ?If I could get two of those would this solve my drift issue ? |
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Re: And so, my first two QSL Cards of the year go out for BitX40 QSO's...
What are you using for an antenna. I am just starting out and wondering about a rotating ?dipole ,I travel in a motorhome sometimes and thought it might be easier to put up.
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Re: troubleshooting the bitx40 receiver
I am still having stability problems with the VFO in the 1st ?BITX 40 I bought in Nov /16 . Works great except for the drifting of the VFO . I ordered a second one and it arrived just before Christmas . Same issue. I see now that they being shipped with Digital VFO module. If I could get two of those would this solve my drift issue ? Other than that they are fantastic !
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Re: Improved audio from the Bitx40 (video)
John - depends on if the filter's bandpass is symmetrical OR the mixing scheme is kept so the IF is not subtracted.?
With USB you'd need to drop the carrier oscillator approx 6 kHz. ?Provision is made on the board for a series inductor for that purpose. ?This would need to be carefully set to provide reasonable audio.? One way around this (especially if using a DDS) is to subtract the IF by having the VFO on the high side. ?Eg for 5 MHz the DDS would be around 17 MHz and for 14 MHz around 26 MHz. ?Then you wouldn't need any USB/LSB switching as it would always be right due to the mixing.? |
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And so, my first two QSL Cards of the year go out for BitX40 QSO's...
Fired the newly completed BitX40 up on New Years Eve - I'd had zero luck on 7.285, but it's probably because I'm a) in Central-South USA (Texas), and b) never the right timing. from El Paso (meh, yeah, it's only a mere, sickly 625 mi / 1022 km from my Dallas QTH), but immediately after our brief QSO, a fellow from Knoxville, TN chimed in, and I was '58', with good audio. Now, that's 772 mi / 1357 km from Dallas in the other direction! The IRF510 gets so hot, it'll drop out until it cools (at least, if it doesn't 'die').
combo, will be a small, temperature-controlled fan, that is - I may have a small, 20mm or 30mm PC fan handy in my 'scrap heap'. in a cheap plastic case - I was able to add a PTT switch to the base of a cheap, Creative-Labs / Labtec, desk-style, microphone. It works great, is light & portable. |
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