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Re: It stopped transmitting
¿ªÔÆÌåÓýBill - I believe I did the same thing to my BITX40 as, now when I flip the switch to transmit, it stays in the receive mode, but the frequency shifts slightly. No sure if the relay switches or if I blew the PA final. Receiver is fine, like your receive. I thought I may have left the radio in transmit mode when I switched off the volume control pot overnight ?(as I had planned to keep the radio powered on) but now believe that the issue may have resulted from using my TS-480 in transmit to locate my BITX40 frequency. Have been hoping to see Farahan's "troubleshooting the BITX40 transmitter" YouTube video, but I guess it still is "in production." If you receive any feedback on correcting your transmit side issues of the BITX40 could you please share this information with me? I ordered the IFR510 and 2n2219a from W8DIZ, but I hope to identify the issue before replacing the parts, if their replacement is even required. 73 ?and tks. W4USF - John - Lutz, FL. Sent from my iPhone On Dec 31, 2016, at 07:07, Bill Kittilson bill@... [BITX20] <BITX20@...> wrote:
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Re: 50 Turns on L4 VFO Inductor?
Thanks John! I'll try stacking first, and see where that gets me. I'll let you know how it goes! On Sat, Dec 31, 2016 at 4:23 AM, iam74@... [BITX20] <BITX20@...> wrote:
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Mark Baldridge 608.561.3853 |
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Re: Questions about Bitx40
Jack Purdum
Yes. I wrote an article for the March, 2016, issue of QST that took a $10 CW transceiver and added a VFO and LCD display. I am currently adding a TFT display to the BITX40 along with the same VFO. The display will show other information besides just the frequency, but I haven't finalized the display yet. I hope to make a hardware mod that will also allow me to use CW. (See pix) Turning a BITX40 into a multi-band rig, however, is going to also require some hardware modifications...software can only do so much.
Jack, W8TEE From: "jagar589@... [BITX20]" <BITX20@...> To: BITX20@... Sent: Saturday, December 31, 2016 10:58 AM Subject: [BITX20] Re: Questions about Bitx40 ? Thank you for the reply. Not being familiar with arduino I was looking for a little more details. What can it be reprogrammed to do without changing anything on the board itself? I've seen frequency display and s-meter. Swr meter? Can it change to a different band through programming? 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Re: Questions about Bitx40
Thank you for the reply. Not being familiar with arduino I was looking for a little more details. What can it be reprogrammed to do without changing anything on the board itself? I've seen frequency display and s-meter. Swr meter? Can it change to a different band through programming? Different modes?
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Re: Information Request
? is a complete built transceiver? but no case or cover? On Friday, December 30, 2016 9:55 PM, "pastor.spaceboy@... [BITX20]" wrote:
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I am interested in getting a Bitx transceiver. I'm disabled, unable to build and low income. Does anybody have a completed transceiver they can donate to me to me or help me out? Randy ka4nma |
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Re: BITX40 with QRPLabs VFO
Thanks for the great info, Hans!? Firmware is s1.02c.? The other piece that I'm sure I saw before, ?but I can't seem to find now. ? What are the pin connections between the BITX40 and the VFO module? I know I'm supposed to connect Clk0 and Ground on the VFO, just need to figure out which is which on the BITX. Kent W9WB On Dec 31, 2016 12:49 AM, "Hans Summers hans.summers@... [BITX20]" <BITX20@...> wrote:
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It stopped transmitting
Bill Kittilson
I managed to kill my bitx40. It was working great until I decided to tune up the big rig. I can still receive. No power at all on transmit. I replace the 510 transistor. Sill no output. The current does jump up to over 1 amp when I switch to transmit.
Any idea what to look at next? |
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Re: 50 Turns on L4 VFO Inductor?
The schematic does say ~50 T of #34 SWG wire on a stacked T-37-6 core.
First, SWG is not the same as AWG, so your #34 may not be quite the same size as called for. The size difference is small, but it adds up. Second, yes, using a stacked core does make quite a difference. Third, there is no reason not to change to a T50-6 or T67-6, and wind on that core. You are aiming for a certain inductance and it dies not matter a great deal how you get there; what changes is the Q of the circuit: Try 50 T on a T50-6 core. It will probably be a bit too much and the frequency generated will be a bit low. Take off a few turns at a time until you hit the right range, then evenly distribute the turns around about 2/3 of the core -- this will be L4. Alternatively, you can increase the capacitance of the tank a bit to lower the frequency as well. Use a single layer coil with the T37-6 and fiddle with the capacitance as above. There are both advantages and disadvantages in a VFO to having the tank circuit inductance weighted or capacitance weighted. Sometimes it is a matter of personal choice. In other words, unless there is an absolutely compelling reason not to do so, one can alter the tank circuit components in the oscillator pretty much at will, provided the end result is the same. Experiment. YRMV (all over the place). john AD5YE ---In BITX20@..., <marktbaldridge@...> wrote : Just double checked. It says 50 turns in the construction manual, 52 on the schematic. See this folder, and file bitx3b.sch.pdf Now, the schematic does say on a stacked T37-6 core. Would two cores stacked make more or less inductance? More inductance would lower the frequency, right? |
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Re: 50 Turns on L4 VFO Inductor?
Just double checked. It says 50 turns in the construction manual, 52 on the schematic. See this folder, and file bitx3b.sch.pdf Now, the schematic does say on a stacked T37-6 core. Would two cores stacked make more or less inductance? More inductance would lower the frequency, right? Thanks for the help. :) On Sat, Dec 31, 2016 at 2:02 AM, Ashhar Farhan farhanbox@... [BITX20] <BITX20@...> wrote:
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Mark Baldridge 608.561.3853 |
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Re: 50 Turns on L4 VFO Inductor?
gaaah! what do you need 50 turns on Ft37-43 for? check your docs again On 31-Dec-2016 1:30 pm, "Mark Baldridge marktbaldridge@... [BITX20]" <BITX20@...> wrote:
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50 Turns on L4 VFO Inductor?
Greetings all, I have been building the through-hole BITX20 v3B from Sunil Lakhani. After a good bit of trouble shooting, and a frustratingly illusive shorted solder joint, I was finally able to hear a signal from my signal generator all the way thorough the receiver! The problem I'm experiencing however, is that I was unable to fit 50 turns of #35 wire on an FT37-6. I think I finally had 39 turns before I ran out of space. And they're tightly packed! Thus my VFO runs at about 5MHz rather than in the 4MHz range. Do you know of any solution for this? Is it okay to have multiple layers of windings on the core? Thank you all! |
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Re: BITX40 with QRPLabs VFO
Hi Kent First check your firmware version, it is displayed at startup. For use with the BITX40 you need version s1.02a or above.? Set the IF offset parameter to -012,000,000 Later you may refine that to the exact BFO frequency, if you can measure or infer it. If you use the GPS and set the GPS Mode Baud parameter to 2 009,600 (which i suppose you did already) then the reference frequency is automatically calibrated.? Otherwise (with no GPS) the Ref Freq parameter also needs to be set to the exact reference crystal frequency. If you set it to 27,004,000 the VFO will be within a couple of hundred Hz and you can improve on that later. Please let me know if any other questions! 73 Hans G0UPL? ? |
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Re: BITX40 with QRPLabs VFO
hans would answer this. he is also available on the qrplabs yahoo group. - f On Sat, Dec 31, 2016 at 9:53 AM, Kent Vanderploeg kvanderploeg@... [BITX20] <BITX20@...> wrote:
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BITX40 with QRPLabs VFO
Can anyone that is using the HFSigs BITX40 with the QRPLabs VFO tell me what settings need to be configured to get it close? I got the QLG1 GPS module working properly and displaying some useful info. ? Just need to get over this last hump. ? Kinda wish I had known the Raduino was coming, ?but work with what ya got, ?right? Kent W9WB? |
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Re: Bitx40 BFO
Hey, Ken--
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Lots of reading indeed. Arv is right. That is where to start. But what you really want to know is: What do I do to hack my BITX40 board? There is provision on the board for an LC pulling circuit via L5, C102, and C103. See the files and look at the various schematics to see what others have done. Especially that of the BITXv.3, the BITX20A and BITX17A, the mode variation circuit of PY2OHH, and the multiband circuit of G6LBQ (and the MKARS80). And don't forget F8VOA. What is it that has to be done exactly? There are several approaches but the usual one is to change the IF to allow or send the USB rather than the LSB through the filter. Which way does one move the frequency? Probably lower, since one is looking at getting the USB into the passband. But it really depends upon your particular rig and what it actually is doing. And how does one get both USB and LSB? Either by shifting the LC circuit in and out to change the BFO frequency, or putting in another crystal and setting that up to respond to a different LC constant, and using diodes (or transistors) to "ground" which one wants to run at any given time. How much shift is needed? Remember that AM radio stations are 10 KHz apart. They have a carrier and two sidebands of about 5 KHz each. You probably will have to shift the IF less than 5 KHz to get either sideband through the filter. The files section has plenty of examples. Hope this helps. john AD5YE ---In BITX20@..., <chase8043@...> wrote : Thanks Arv Lots of reading to do this weekend. Also will be pulling out the bible(EMRFD). 73 Ken
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Re: Bitx40 BFO
Thanks Arv Lots of reading to do this weekend. Also will be pulling out the bible(EMRFD). 73 Ken On Fri, Dec 30, 2016 at 3:56 PM, Arv Evans arvid.evans@... [BITX20] <BITX20@...> wrote:
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Re: Bitx40 BFO
Ken Maybe a better answer is to talk a bit about crystal pulling and how it is done. As you may already know it is possible to use a variable capacitor in series with a crystal to make slight alterations to its oscillation frequency.? While this has some effect and is frequently used to bring a crystal to its exact stated operating frequency it does have some limitation in pulling range. An alternative to using just a variable capacitor to change crystal frequency is to make a series LC network for the crystal frequency and then add the crystal in series with that.? When the L or C value is changed slightly the LC network tends to pull the crystal up or down in frequency by a larger amount than can be done with just a capacitor. The series LC-Xtal network can be applied to many types of oscillator circuit.? Arv? K7HKL _._ On Fri, Dec 30, 2016 at 1:44 PM, ron van doremalen ronvandoremalen@... [BITX20] <BITX20@...> wrote:
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