Date   
Re: Bitx40 - Not Transmitting #bitx40help #bitx40

Timothy Fidler
 

Polarity it critical.

There is a small Linear IC equiv approx to  a u741 built into the mic insert.   Generally one of the mic solder tabs on the back will  be marked with a posittive to show correct polarity. Your mileage may vary.

If the mic insert has been reverse powered it may be toasted (there are ways to test this depending on what test gear you have) .  It may well depend on the manufacturer. Some may install a protection diode, some not.

If you wired it  exactly the same way as the previous insert assuming the back solder tabs looked the same you should be fine - they are generally build to the same pattern.  Unless you have photos of what you did originally Red to which terminal etc,  it is surprising how tricky memory can be. 

 

Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885, 
Telephone Whangarei   022  691 8405
e: Engstr@...



----- Original Message -----
From:
BITX20@groups.io

To:
<BITX20@groups.io>
Cc:

Sent:
Fri, 28 Dec 2018 01:16:00 -0800
Subject:
Re: [BITX20] Bitx40 - Not Transmitting #bitx40help #bitx40


Thank you , Timothy

I am not using a Dynamic mike, I am using the small electret mike as was supplied with the kit.
I make up the mic with a plastic enclosure and a switch for the PTT.
4 wires, 2 for the PTT and 2 for the Mic.

Just a thought - how important is polarity on the mic ? (could it be that I have switched the Pos and Neg ??)

Have been running the rig on a 13.8 DCV regulated power supply with a 2amp fuse.

Re: Bitx40 - Not Transmitting #bitx40help #bitx40

Timothy Fidler
 

On a related matter, the  heat sink of the IRF 510 on this tcvr and also on the uBitx  is live to ground ( It's a feature !!) Bear that in mind when working on it or casing it.  The Fuse on the supply line is good but it is likely the IRF will be destroyed first if the heat sink touches ground (current will flow  from the PSU to the Drain , out the tab on the case ,the Heat sink and to GND).  

Re: Bitx40 - Not Transmitting #bitx40help #bitx40

Gary.ingle@...
 

Thank you, Timothy

It seems that the mic may be the underlying cause and if I have connected it in reverse polarity I may have damaged it.
Then testing with a damaged mic has invalidated all the tests performed
I will go and purchase a new one as they are quite cheap (ZAR 12)
I will double check the polarity on connecting it up.

Thank you for the tip on the positive heat sink.

Re: Bitx40 - Not Transmitting #bitx40help #bitx40

 

Electret and Ceramic are two different types AFAIK. Electret is not AKA ceramic.


At 28-12-18, you wrote:

On second thoughts, you replaced the main  board ( I re read earlier post) . The chance of having two bad K1 relays seems remote - depending on what voltage you are running the thing on and how much use they have had.

2. Bear in mind ONLY a electret,  aka ceramic mike insert will work with this Bitx40 board as it stands.  If you replaced the microphone with a dynamic microphone as part of the testing ,  it won't work. (The circuit feeds out a low dc voltage to the microphone insert which the Dynamic Microphone does NOT want to see.) If you went.  Problem - > change to Dyna mike,  Problem remains,  ->change out PCB but retain second mike , I can see  where this is heading. (?)

uBITXv4 for sale #ubitx

 

I have too many radios! (like 6 transceivers, including another uBITX)  This is a version 4 uBITX in a nice case (Fry's).  It has a 2.8" Nextion display, AGC/S meter, Axicom relays, and an LM386 audio amp. (The original audio is all there, just not loud enough for me) Includes power cord and mike. I used it on FT8 and SSB.  Asking $199, which includes USPS Priority shipping CONUS only.  Thanks, Jim W0CHL

Re: uBITXv4 for sale #ubitx

Bill Cromwell <wrcromwell@...>
 

Hi Jim,

There is no need any more to restrict sales to the 48 CONtigious United States via USPS. The priority and flat rate shipping is good for ALL states and any US territories. That includes the states if Hawaii and Alaska as well as places like Guam (US Territory). Any places that as a USPS post office address (including APO and FPO addresses). You might say something like "USPS postal addresses only". Saying "CONUS only" limits your sale opportunities without any "safety" benefit to you.

I have sent parts to US personnel on Guam way out there over the Pacific Ocean in USPS Priority Mail Flat-Rate box with *NO* issues. It's 2018 - almost 2019. Not 1948. I don't want to sell or send to non US locations either.

Happy New Year and 73,

Bill KU8H

On 12/28/18 8:46 AM, Jim Reagan wrote:
I have too many radios! (like 6 transceivers, including another uBITX) This is a version 4 uBITX in a nice case (Fry's).  It has a 2.8" Nextion display, AGC/S meter, Axicom relays, and an LM386 audio amp. (The original audio is all there, just not loud enough for me) Includes power cord and mike. I used it on FT8 and SSB.  Asking $199, which includes USPS Priority shipping CONUS only.  Thanks, Jim W0CHL
--
bark less - wag more

Re: uBITXv4 for sale #ubitx

Bob Villa
 


Hi Jim:

I am outside CoNus ( Puerto Rico) and would like to buy it

Miguel WP4ZI

On Fri, Dec 28, 2018 at 10:14, Bill Cromwell
<wrcromwell@...> wrote:
Hi Jim,

There is no need any more to restrict sales to the 48 CONtigious United
States via USPS. The priority and flat rate shipping is good for ALL
states and any US territories. That includes the states if Hawaii and
Alaska as well as places like Guam (US Territory). Any places that as a
USPS post office address (including APO and FPO addresses). You might
say something like "USPS postal addresses only". Saying "CONUS only"
limits your sale opportunities without any "safety" benefit to you.

I have sent parts to US personnel on Guam way out there over the Pacific
Ocean in USPS Priority Mail Flat-Rate box with *NO* issues. It's 2018 -
almost 2019. Not 1948. I don't want to sell or send to non US locations
either.

Happy New Year and 73,

Bill  KU8H

On 12/28/18 8:46 AM, Jim Reagan wrote:
> I have too many radios! (like 6 transceivers, including another uBITX) 
> This is a version 4 uBITX in a nice case (Fry's).  It has a 2.8" Nextion
> display, AGC/S meter, Axicom relays, and an LM386 audio amp. (The
> original audio is all there, just not loud enough for me) Includes power
> cord and mike. I used it on FT8 and SSB.  Asking $199, which includes
> USPS Priority shipping CONUS only.  Thanks, Jim W0CHL


--
bark less - wag more



Straight Key Night

Michael Walker
 

As a thought, if you own one of these you should get on the air on Monday night with your Ubitx for Straight Key Night.  It is a long old ham radio tradition.

Objective: This 24-hour event is not a contest; rather it is a day dedicated to celebrating our CW heritage. Participants are encouraged to get on the air and simply make enjoyable, conversational CW QSOs. The use of straight keys or bugs to send CW is preferred. There are no points scored and all who participate are winners.

Mike va3mw

Re: Straight Key Night

Bill Cromwell <wrcromwell@...>
 

Hi Mike,

Thanks for the reminder. I will try to get some operating time in for that. Most of my time will be taken by another long, old tradition - taking my lady out to a new years eve supper, party, dance. There will be some 'recovery time' involved. I want try my PFR-3 on the air. If I throw a couple of switches I can also use the uBitx:)

Happy New Year and 73,

Bill KU8H

On 12/28/18 9:24 AM, Michael Walker wrote:
As a thought, if you own one of these you should get on the air on Monday night with your Ubitx for Straight Key Night.  It is a long old ham radio tradition.
*Objective: *This 24-hour event is not a contest; rather it is a day dedicated to celebrating our CW heritage. Participants are encouraged to get on the air and simply make enjoyable, conversational CW QSOs. The use of straight keys or bugs to send CW is preferred. There are no points scored and all who participate are winners.
Mike va3mw
http://www.arrl.org/straight-key-night
--
bark less - wag more

Re: uBITXv4 for sale #ubitx

Jack Purdum
 

I have too many radios!

Naw. This is too many radios...

Inline image

Jack W8TEE

On Friday, December 28, 2018, 8:46:12 AM EST, Jim Reagan <jimreagans@...> wrote:


I have too many radios! (like 6 transceivers, including another uBITX)  This is a version 4 uBITX in a nice case (Fry's).  It has a 2.8" Nextion display, AGC/S meter, Axicom relays, and an LM386 audio amp. (The original audio is all there, just not loud enough for me) Includes power cord and mike. I used it on FT8 and SSB.  Asking $199, which includes USPS Priority shipping CONUS only.  Thanks, Jim W0CHL

Re: uBITXv4 for sale #ubitx

Gordon Gibby
 

Who is that? Is that you Jack?


On Dec 28, 2018, at 09:57, Jack Purdum via Groups.Io <jjpurdum@...> wrote:

I have too many radios!

Naw. This is too many radios...

<W9EVTShack.jpg>

Jack W8TEE

On Friday, December 28, 2018, 8:46:12 AM EST, Jim Reagan <jimreagans@...> wrote:


I have too many radios! (like 6 transceivers, including another uBITX)  This is a version 4 uBITX in a nice case (Fry's).  It has a 2.8" Nextion display, AGC/S meter, Axicom relays, and an LM386 audio amp. (The original audio is all there, just not loud enough for me) Includes power cord and mike. I used it on FT8 and SSB.  Asking $199, which includes USPS Priority shipping CONUS only.  Thanks, Jim W0CHL
<W9EVTShack.jpg>

Re: BitX40 low power output #bitx40

David Arthur
 

Jerry, thanks for the tips. I was able to adjust RV1 and see 100mA with the key down and no audio input. However, I do not see the 1A current when shouting/whistling into the mic. My "power meter" is a QRP Labs dummy load with pinouts for the voltage across the resistors (and a formula for calculating watts). I still only see 3V peak across the load which is very low (should be like 20V or more I think).

How can I further inspect the audio chain to see where my signal is dropping off?

Re: Antuino - the antenna analyzer

K5ESS
 

Jerry,

Despite the data sheet implying that pins 1,4,and 5 are tied together internally only pins 1 and 5 are tied together.  I just examined one to confirm this.

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Thursday, December 27, 2018 11:55 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Antuino - the antenna analyzer

 

My ADE-1 document just says that pins 1,4,5 are all ground, 
3 is RF, 6 is LO, and 2 is IF. out.
Your schematic suggests that 4 is only the "ground" for the RF port,
and is not connected to the other two ground pins internally.

I suppose R21,R29,R16, and an antenna on P3 would form a balanced
bridge when the antenna is 50 ohms, CLK1 is driving the antenna and the top of the bridge.
The ADE-1 RF port sees any imbalance across the bridge.
CLK2 into the LO port is 25mhz above (or below) CLK1.

Still no idea what CLK0 and P4 are up to.

Jerry

On Thu, Dec 27, 2018 at 09:35 PM, Jerry Gaffke wrote:

And last but not lest, what the devil is going on around that ADE-1 mixer?

Re: Bitx40 - Not Transmitting #bitx40help #bitx40

Gary.ingle@...
 

Hooray  !!!  Thank you all for the assistance.

The root cause was connecting the mic with the wrong polarity.

A new mic and correct polarity connection and I am sorted.

I have learned a valuable lesson, thank you all

Gary

Re: Bitx40 - Not Transmitting #bitx40help #bitx40

Timothy Fidler
 

Which is to say the old mike failed then you put a new one in with wrong polarity ? 
 

Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885, 
Telephone Whangarei   022  691 8405
e: Engstr@...



----- Original Message -----
From:
BITX20@groups.io

To:
<BITX20@groups.io>
Cc:

Sent:
Fri, 28 Dec 2018 09:41:53 -0800
Subject:
Re: [BITX20] Bitx40 - Not Transmitting #bitx40help #bitx40


Hooray  !!!  Thank you all for the assistance.

The root cause was connecting the mic with the wrong polarity.

A new mic and correct polarity connection and I am sorted.

I have learned a valuable lesson, thank you all

Gary

Re: Straight Key Night

Scott McDonald
 

Any thoughts about a uBITX cw freq? 077 would seem a bad bet but it would be nice if we had a cw watering hole in addition to 177/277.

Hope to catch some of you on.  Scott Ka9p


On Dec 28, 2018, at 8:24 AM, Michael Walker <va3mw@...> wrote:

As a thought, if you own one of these you should get on the air on Monday night with your Ubitx for Straight Key Night.  It is a long old ham radio tradition.

Objective: This 24-hour event is not a contest; rather it is a day dedicated to celebrating our CW heritage. Participants are encouraged to get on the air and simply make enjoyable, conversational CW QSOs. The use of straight keys or bugs to send CW is preferred. There are no points scored and all who participate are winners.

Mike va3mw

Re: Antuino - the antenna analyzer

Arv Evans
 

Farhan

Very good RF analyzer design and build.  Is that going to become a BITX-Labs product
at some future time? 

Happy New Year!

Arv  K7HKL
_._


On Thu, Dec 27, 2018 at 9:28 PM Ashhar Farhan <farhanbox@...> wrote:
peeps,

while trying to measure the swr on the cubesats, i figured i couldnt use any of the analyzers i had access to. they were simply too big to be stuffed inside a 10 cm cube. my simple resistive bridge was too insensitive for any reasonable work. so, i sat down and made an antenna analyzer from a spare raduino. 

the code is wobbly and just about enough to get my work done. it works on a superhet principle. this is not my clever idea, rahul had mentioned this approach taken by a russian builder. i havent seen the original design. it would be interesting if rahul or someone can point me in the right direction.

the code and a pdf of the circuit is on https://github.com/afarhan/antuino. i am attaching the circuit for the lazy bones.

have a great holiday and get some dx !!

- f

Re: Antuino - the antenna analyzer

MadRadioModder
 

This could easily be turned into a simple SA.  I’ll bet Kees already has the boards mocked up…

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Ashhar Farhan
Sent: Thursday, December 27, 2018 10:28 PM
To: bitx20@groups.io
Subject: [BITX20] Antuino - the antenna analyzer

 

peeps,

 

while trying to measure the swr on the cubesats, i figured i couldnt use any of the analyzers i had access to. they were simply too big to be stuffed inside a 10 cm cube. my simple resistive bridge was too insensitive for any reasonable work. so, i sat down and made an antenna analyzer from a spare raduino. 

 

the code is wobbly and just about enough to get my work done. it works on a superhet principle. this is not my clever idea, rahul had mentioned this approach taken by a russian builder. i havent seen the original design. it would be interesting if rahul or someone can point me in the right direction.

 

the code and a pdf of the circuit is on https://github.com/afarhan/antuino. i am attaching the circuit for the lazy bones.

 

have a great holiday and get some dx !!

 

- f


Virus-free. www.avg.com

--

…_. _._

Re: The K5BCQ AGC and PopFix schematics as pdf's, list of parts from Mouser

Jerry Gaffke
 

That list of part numbers is all surface mount, appropriate for 
the board design that Kees did.
My way of encouraging somebody else to take up producing the kits.

Here's the two threads relating to those kits.
    https://groups.io/g/BITX20/topic/18098324
    https://groups.io/g/BITX20/topic/22435274
Don, ND6T, came up with the circuit designs and built his by hand.
Kees, K5BCQ, did a board design, fabbed it, bought parts on reels,
and sent out nearly 1000 kits of each.

For a one-off, could fab the board using those gerbers from Kees.
But I'd probably just solder parts ugly style to a scrap of PC board,
or perhaps directly to the ground plane on the back of the Bitx40 or uBitx, 

All those parts are available in a through-hole version, if that's what you want.
The surface mount parts that Kees used are extremely small.
Could move up from 0805 to 1206 surface mount resistors and caps if not using Kees' gerbers.

Resistors and caps don't need special parts, 20% tolerance is fine.
I'd go for caps rated for 25 volts or more, though less should be sufficient.

Jerry, KE7ER



On Thu, Dec 27, 2018 at 08:56 PM, Jerry Gaffke wrote:
Here's a list of parts, quantities are for both boards together, looks good but not verified:
Prices are around a $0.10 each for semiconductors, $0.05 for caps and resistors,  if buying 10 at a time.
Columns are:  quantity,  generic part number,  package,  Mouser part number.

2  1N4148W    SOD-123    78-1N4148W-E3-18
1  MMBT3904   SOT-23    771-MMBT3904T/R
5  2N7002   SOT-23         757-T2N7002AKLM
5  10nF        0805             710-885012207092
2  100nF      0805             710-885012207098
4  1uF        0805               710-885012207078
1  1k           0805               755-ESR10EZPJ102
2  10k         0805               755-ESR10EZPJ103
7  100k       0805               755-ESR10EZPJ104
3  330k       0805               755-ESR10EZPJ334
1  1meg      0805               755-ESR10EZPJ105

Re: Antuino - the antenna analyzer

Jerry Gaffke
 

It already is a simple SA.
Just shut down CLK1 coming out of the SI5351.
Includes a tracking generator at CLK0/P4.

Jerry, KE7ER


On Fri, Dec 28, 2018 at 10:41 AM, MadRadioModder wrote:
This could easily be turned into a simple SA.