Timothy But you also made some claims that need backing up.?
- HF Signals back ordering...?
Is that really true?? Where did you get that information??
- On Tue, Nov 6, 2018 at 12:59 PM, Timothy Fidler wrote:
HFSigs seem to have made some hardware mods to the Bitx40
Which boards does this comment apply to?? Where did you get that information?
We need reliable information.? Arv _._
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Yes.??? I was about to put it on eBay.
I could ship it tomorrow.?? Priority or std,? it should get to about anywhere in the US within 3-4 days.
Priority 3 or less. ? ? ? ? Sent from for Windows 10 ?
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The Bitx40 that M Trager (lately of these pages ) rxd was a nightmare and he gave up on it.? I had him search the cct? and he related what J Gaf above has noted.? Trager had changed out the full xtal set by this time (as received and even after calib , it did not even receive)... He did have it receiving fine after a lot of work on the PCB including ordering? 20 more xtals from Digkey and matching them [time is money] .. once he and I realised the PCB as supplied was different from the schematic,? he threw up his hands and said - Genug.. I am over it.? At that stage there was a lot of carrier bleed through the filter? so he and I were suspicious of the Bal modulator and the diodes .... you could try to hunt him up on these pages but I 'd say he is trying to find solice in the bottom of a Jack Daniels bottle at the moment.
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That older Bitx40 would have to be at least 2 years old, from before they had a Raduino.
The modulator then was two discrete 1n4148a's and a pot.
The Bat54s now used has the two diodes on one die and they are thus well matched,
but the internal connection in the Bat54s precludes the use of a pot.
If you want to play with discrete diodes and pot to see if you can improve
carrier rejection, that would be trivial to?hack into a current day Bitx40 or uBitx.
No need to browse hamfest flea markets for ancient Bitx's.
Crystal matching is generally pretty good on these rigs, but it's tough to take out?
a strong carrier that's just a few hundred hertz away from the passband.
With current uBitx firmware and with Allard's v2 firmware for the Bitx40,
the BFO is driven from clk0 of the si5351 and thus easily adjusted.
Jerry
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On Tue, Nov 6, 2018 at 12:59 PM, Timothy Fidler wrote:
B Shep ; reading between the lines on some work I did with M Trager , HFSigs seem to have made some hardware mods to the Bitx40 (modulator area and leaving out the trim cap on the BFO OSC which is a critical item if the crystal matching is not as good as it might be) and Like Kenny Rogers? ,after going to Nam, "it's not the man it used to be " .? You may well be better off buying an older unused board than more recent one. My Tuppence.
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On Tue, Nov 6, 2018 at 12:59 PM, Timothy Fidler wrote:
HFSigs seem to have made some hardware mods to the Bitx40
Huh. Got any more details or sources? Not that I don't believe you, just...trust but verify, right? -- Jon Tabor KI7JYE
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B Shep ; reading between the lines on some work I did with M Trager , HFSigs seem to have made some hardware mods to the Bitx40 (modulator area and leaving out the trim cap on the BFO OSC which is a critical item if the crystal matching is not as good as it might be) and Like Kenny Rogers? ,after going to Nam, "it's not the man it used to be " .? You may well be better off buying an older unused board than more recent one. My Tuppence.
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On Tue, Nov 6, 2018 at 12:58 PM, Timothy Fidler wrote:
B Shep -? reading between the lines on some work I did with M Trager , HFSigs seem to have made some hardware mods to the Bitx40 (modulator area and leaving out the trim cap on the BFO OSC which is a critical item if the crystal matching is not as good as it might be) and Like Kenny Rogers? ,after going to Nam, "it's not the man it used to be " .? You may well be better off buying an older unused board than more recent one. My Tuppence.
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Interesting. I bought one (my first!) last week, and it shipped yesterday.
Jon
KI7JYE
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I might be willing to buy it lol!!!
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I do not know if mine is a 40 or what but I bought it about three months ago. I am not going to build it I am going to sell it. ?
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On Nov 6, 2018, at 1:12 PM, Billy Shepherd < dis60cd@...> wrote: Hi folks. Was getting ready to order another Bitx40 and noticed that my order wouldn't ship until after December 25th. I guess I'm wondering if that is correct lol... thinking (hoping) that's a misprint.
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Re: ?BITX: CAT connection
I'm using the current CEC firmware but that shouldn't matter.? Just connect a USB cable to the Arduino, and set the software for FT-817, 38400 speed, and select the correct com port for your raduino.? In WSJT-X I also had to select the 'USB' option so that the radio would switch to upper sideband. /g/BITX20/topic/cat_control/21675686?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,21675686Best, Andy, KG5RKP
On Tue, Nov 6, 2018 at 02:05 PM, Karsten Heddenhausen wrote:
Hello!
I read that i could use a CAT interface, but how do i have to wire it? Or does it use the USB port of the radiumo?
73 de Karsten DC7OS
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Hi folks. Was getting ready to order another Bitx40 and noticed that my order wouldn't ship until after December 25th. I guess I'm wondering if that is correct lol... thinking (hoping) that's a misprint.
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Re: the cause for the spurs, found!
If one swaps the 3904s for BFR106s in the transmit side amp, is it a transistor swap, or will the job also require re-biasing?
I'm wondering if I should try this, or if it would be better to stay on the porch until the adults report back?? ;)?
Thanks!
Andy, KG5RKP
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On Sun, Nov 4, 2018 at 02:01 PM, ajparent1/KB1GMX wrote:
Farhan,
For the 45mhz amp the only part suggested was BFR106 or maybe 2n2369/mmbt2369.
I'd not use 2n2222 there but its better than 3904.? Any suggestion of of 2n2222A would
have been in the power amp area predriver or driver.
Allison
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Hello!
I read that i could use a CAT interface, but how do i have to wire it? Or does it use the USB port of the radiumo?
73 de Karsten DC7OS
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Last 24 hours on WSPR.? I guess nobody told my ?BITX that the bands are dead.  --
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Hello,
I heard about one or several other QRP kits that come with FT8 in the radios OS. ?Is FT8 something that can be worked in to a Micro-Bitx with a phone or PC For time and display but without a sound-card interface?
Thanks,
Misha VE9GIS FN76
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Re: new unbuilt for sale
#ubitx
Weird,? and funny !! ? The ¡°ing¡± got moved ¡??? should not be in front of the word ¡°on¡± and should be at the end of the word ¡°build¡± ? ±á³¾³¾³¾³¾³¾¡ ? Sent from for Windows 10 ?
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From: RuartoSent: Tuesday, November 6, 2018 10:07 AM To: [email protected]Subject: [BITX20] new unbuilt for sale #ubitx ? I bought a unit a couple months back ingon a lark, and will not be build it,? ?so am offering it for sale.
Its all there as it came to me except opened for inspection.? ?
?Ready for you to assemble in your own case.? ??
I am however adding a mic.? ??
$135 plus $6 postage (in US) and its yours.? ? If in a hurry then use $10.50 postage for Priority.
Thanks.
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I bought a unit a couple months back ingon a lark, and will not be build it,? ?so am offering it for sale.
Its all there as it came to me except opened for inspection.? ?
?Ready for you to assemble in your own case.? ??
I am however adding a mic.? ??
$135 plus $6 postage (in US) and its yours.? ? If in a hurry then use $10.50 postage for Priority.
Thanks.
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Re: Bitx 40 12 volt power plug-in connector help please 4 wires go to? I'm getting stuck trying to figure out , 2 black I assume are grounds, the brown 12 volt positive, don't know where the red go's Thanks for any help.
Wording in the instructions may be a bit confusing.? The 4th wire is for connecting separate DC power to the RF PA section.? This lets you use higher voltage on the transmitter output stage than the 12V
used for other parts of the rig.
Arv _._
Step 2: DC Power Connections
The DC power from the socket goes to the board through the on/off
switch on the volume control. From the ON/OFF switch, route the power
a?parallel connection also goes to the transmitter power amplifier. This
is kept as a separate connection on the board so that you can feed the
power amp with a higher voltage.
- Use a two-wire connector as shown in the diagram¡¯s upper right side to supply +12v power to the board.
 - The brown wire should go to +12V line from the power supply and the black wire should go to ground line of the power supply.
- The supplied DC socket can be hooked to the DC power lines. The
large pin on the DC socket is the postive line (see the picture below
- You may route the positive power line through the ON/OFF switch on the volume control
- Use another PA POWER line to feed power to the Power Amplifier. This is shown on the top-left part of the wiring diagram
 
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Karsten Heddenhausen
