Re: DIGITAL FREQUENCY READOUT
Allison is correct as usual, on further inspection, there is another crystal on the other side of the Nano board.? I can not read the stamped information on the units that I have, even worse that the CH340 crystal.
Still, not the source of the frequency offset error.
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Re: DIGITAL FREQUENCY READOUT
Are you sure that in not the crystal for the CH340 USB to serial?
All the Nanos I have the MPU crystal is on the front (side where the atmel MEGA328P many legged chip is).
The likely cause of the 1khz offset is likely either BFO incorrectly set, or cumulative error in the math.
From memory the frequencies calculated and displayed are based on 5351 output frequencies and
would match the Zero beat frequency (if cal in correct) and do mot match the filter center channel
frequency.
Allison
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Re: DIGITAL FREQUENCY READOUT
That looks like an Arduino Nano board, not the Raduino in a uBitx. I checked one of my spares and noted what could be taken as 20 J stamped in the crystal, though I thought the Nano was clocked at 16 mHz.I opened my second pack of three, they were stamped ZOG as far as I could tell with a bright light and magnifying lens.? That is some mighty small print.
When I checked on line the top end for the ATMega328p is 20 mHz, so it could be a 20 mHz crystal.
Here are pictures of a Raduino board with the ATMega328p Nano plugged in.
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Re: DIGITAL FREQUENCY READOUT
HERE IS A PHOTO OF BOARD AND CRYSTAL.
W4NFR
On 11/9/2018 9:57 AM, Mvs Sarma wrote:
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OMG. acidentally crept in perhaps .
could you please share a? photo please, !!!!!
regards
sarma
?vu3zmv
On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH < w4nfr@...>
wrote:
I OPENED UP MY uBITX? AND TOOK A LOOK AT THE S1535A
BOARD. THE CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0
MHZ?
On
11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"?
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Need Source for Baofeng Mic Sockets
Want to use a Baofeng mic on my BitX40 but have not been able to find sockets for the cabinet. Anyone know of where I could get them?
Thanks, Scot WB7AVU
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Re: DIGITAL FREQUENCY READOUT
OMG. acidentally crept in perhaps . could you please share a? photo please, !!!!!
regards
sarma ?vu3zmv
On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH < w4nfr@...> wrote:
I OPENED UP MY uBITX? AND TOOK A LOOK AT THE S1535A BOARD. THE
CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?
On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"?
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This email has been checked for viruses by AVG antivirus software.
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Re: DIGITAL FREQUENCY READOUT
I OPENED UP MY uBITX? AND TOOK A LOOK AT THE S1535A BOARD. THE
CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?
On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
The crystal is not "bad"?
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This email has been checked for viruses by AVG antivirus software.
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I OPENED MY RADIO TO INSPECT THE CRYSTAL ON THE S15351A BOARD.
THE NUMBERS 20.0 IS STAMPED ON THE CASE INSTEAD OF 25.0?
COULD THIS BE MY TROUBLE WITH THE FREQUENCY READOUT OF 1 KHZ LOW .
W4NFR
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I used this to line the interior of my plastic case.? I overlapped the tape and soldered sections together at the overlap.
https://www.amazon.com/dp/B01I1XNY1E/ref=sspa_dk_detail_0?psc=1&pd_rd_i=B01I1XNY1E
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so, there is one spur fix that is now consistently working for me. among rhe solutions, i was looking for one that would be easy to apply. first, the distortion in the 45 mhz amp is creating harmonic distortion. so a 0.3uh in series with a 10 pf is used across TP13 (output of the 45 MHz IF amp going to the front end mixer). 8 turns on T30-6 gives you 300nh. second, there is a cross talk inside the Si5351 where the 12 mhz from the bfo leaks into the local oscillator. A 5uh in series with a 47 pf across C202 of the LPF will suppress it. 35 turns on T30-6 gives you 5uh. - f
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I believe you meant hamskey web Ian Lee web site.
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S meter using lm358 as sensor is very simple. One more sensor version is using another Arduino. For more info refer hamsky web.
On Fri, Nov 9, 2018, 12:23 AM David Posthuma < davep@...> wrote: I have been using KD8CEC's 1.095 version of the Firmware and have been very happy with it. I am using a 3.7-inch?Nextion?display. My question is two-fold:
1) What extra benefits would I get for upgrading to 1.097??
2) I need to add an S-Meter, what sensor and setups are best for either version?
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Re: Ubitx wiring harness pics
Hi Doug For illustartion pupose it was left ?there Yes I know it can be taken out by inserting a pin into the notch 73 Pop VU2POP ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Doug W
Sent: Thursday, November 08, 2018 8:13 PM
To: [email protected]
Subject: Re: [BITX20] Ubitx wiring harness pics ? Those unused wires come out of the connectors very easily.? Just push down on the tab on the connector with a needle or jeweler's screwdriver and pull them out.? You can put them back in if you need them later.? Although it looks tidy, those coils look scary to me.
--
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Re: CEC firmware installation using a MAC
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?Regarding the shielded enclosures, yup, most good radios are enclosed in metal cases.
?Receiver only is far less fussy. ?I was looking at a number of possible cases for my BITX, and decided on a BUD enclosure, all aluminum ?It is big enough for the HF Signal BITX40, but turns out not for another BITX I am assembling. ?Boards too wide to fit both exciter and PA boards in it. ?I see all these great looking plastic cases, but figured that I do not want to go with no shielding. ?Hence the one that will go into a cassette? deck case will have shielding. ?The ferrite beads have their places, but don't take the place of good shielding, which may also help prevent images and harmonics , plus spurs, from escaping. ?YMMV ?Wayne WA2YNE
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Re: uBITX AGC - Adafruit TPA2016, A Success!
#ubitx
Joe
I am contemplating same thing. Note the? nd6t website shows 2 different agc designs, and note the link to adding an RF gain control. This is one candidate location for the mosfet attenuator,? even without installing an RF gain control that so far I don't need. I also thought about it at the front of the audio chain. I wonder if the agc bias could be injected into the existing TR mosfet, if not easy to add a second mosfet there. Worth some experiments to see what works well.
Curt
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Re: Boy Scout activity event
Bruce
I would like the details also.? I am on QRZ or Olson339 ?at Comcast dot net
73
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On Nov 8, 2018, at 9:34 PM, Bruce MacKinnon KC1FSZ < bruce@...> wrote: Hi Jack:
I'll send you the details directly since this thread is off-topic.? Anyone else who is interested feel free to drop me a line.
73s,
Bruce KC1FSZ
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Re: Boy Scout activity event
Hi Jack:
I'll send you the details directly since this thread is off-topic.? Anyone else who is interested feel free to drop me a line.
73s,
Bruce KC1FSZ
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Re: DIGITAL FREQUENCY READOUT
The crystal is not "bad"?
http://www.hamskey.com/2018/05/frequency-adjustment-of-ubitx-si5351.html
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