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 -----
To: <[email protected]>
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
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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: Antuino - the antenna analyzer
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 ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Thursday, December 27, 2018 11:55 PM
To: [email protected]
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?
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Re: BitX40 low power output
#bitx40
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?
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Who is that? Is that you Jack?
On Dec 28, 2018, at 09:57, Jack Purdum via Groups.Io < jjpurdum@...> wrote:
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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>
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I have too many radios!
Naw. This is too many radios...
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
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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
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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
--
bark less - wag more
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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
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Hi Jim:
I am outside CoNus ( Puerto Rico) and would like to buy it
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
|
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
toggle quoted message
Show quoted text
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
|
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
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Electret and Ceramic are two different types AFAIK. Electret is not AKA
ceramic.
At 28-12-18, you wrote:
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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. (?)
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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.
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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).??
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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 -----
To: <[email protected]>
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.
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Thank you, Jakobus
I am at the office at the moment.
I will check polarity as soon as i get home
Regards
Gary
ZS5GI
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Yes it is polarity concious. If you look at the capsule 2 connection pads, you will see that one of them have tracks to the casing. That is the negative one. The one that has no tracks to the casing is the positive one.?
On Fri, 28 Dec 2018, 11:16 Gary.ingle via Groups.Io <Gary.ingle= [email protected]> wrote: 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.
|
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: Antuino - the antenna analyzer
jerry,
i built it so i could stuff it inside the cubesat to measure the antenna. an external spectrum analyzer and its cables were upsetting the RF model hence, i needed something that could read the return loss sitting inside the cubesat. then, i borrowed by daughter's DSLR with a monsterous tele lens and sat 100 meters away to read the the LCD display as it swept through the range.? the analyzer was removed once we knew the correct dimensions and the actual payload went inside the bird. - f
On Fri, Dec 28, 2018 at 1:19 PM Jerry Gaffke via Groups.Io <jgaffke= [email protected]> wrote: Farhan,
OK. so best thought of as a basic spectrum analyzer
Has a return loss bridge up front to measure SWR.
Not weird at all.
But does look very cheap and buildable.
I've been thinking of building a spectrum analyzer along those lines for a couple years now.
Snow on the ground here and it's darn cold, could be a good time for it.
The fact that this thing had to be small enough to fit into the cubesat
suggests it's still in there, flying madly about the earth.
And that you are using it to verify that some 440mhz antenna?
didn't get eaten by space aliens?
Jerry
On Thu, Dec 27, 2018 at 10:28 PM, Ashhar Farhan wrote:
The circuit here uses a resistive return loss bridge. the clock 1 drives the bridge through the R22 to a low level of -10dbm. If the bridge is perfectly balanced (that is, the antenna, R21, R29, R16, all the four are the same ohms), then, there will be no RF developed across pins 3 and 4 of the ADE mixer.?
..........
So, the ADE-1 mixer, Q2, Q1 together form a very simple superhet receiver with 25 MHz IF andCLK2 as the local oscillator. The RF at the IF is directly detected and converted to db range with the AD8307. This simple configuration makes this a very powerful instrument.
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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. (?)
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Raj vu2zap
Kobus ZS6CHK