Re: Low mic gain and rf power
I have the same problem with 2 of my Bitx40's.
Ed W0OIC
On 6/6/2017 5:29 AM, Jirka wrote:
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Hello everybody.
?
My name is Jirka,
callsign OK1IEC, and I am new in the group. Recently I bought
BITX40v3 and built it in the Al box. RX is ok, comparable? with
my K2 in normal conditions. The problem is with transmitting ¨C I
am not able to reach more than about 1W of output power shouting
very loudly into electret mike. Mike change does not help, pot
R136 is in the full gain position.
I? decided to do
some measurements: I? used Audacity software to produce 1 kHz
audio and connected it to Mic pins of BITX40 via 47uF
capacitor.? I need 280mV p-p AF signal to get 6W RF output power
on my dummy load.
AF signal
levels:?? Mic (C121): 280 mV p-p;? C122: 410
mV p-p
RF signal levels: C132: 1.3V p-p;? C134: 3.45V
p-p;? C141: 3.25V p-p; C152: 8.6V p-p; C155: 51V p-p; Antenna:
50V p-p.
It seems the RF chain is ok but? AF stage Q12 has
suspectly low gain. Components seem to be ok, Q12 Uc=10V,
Ue=2.26V
Any idea or advice appreciated. ?
73! Jirka
?
Trafo T4 in BFO mixer ??? BTW I see the
difference between schematic (D15, D16, R106) and real
components on the pc board.
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300Km with a bicycle and my Bitx40
Hi,
Two months ago I did a small trip of 300km in French mountains with my bicycle, bitx40, a chromebook and my fishing pole.
If you want to read more (ans see picts) : (Sorry, it's written in french, but you can use google translate)
It's one aspect of the QRP fun !
Julien, F4HVX
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Re: Raduino error to solve
If this is a copy/paste, you have a curly bracket missing. It should look like this:
void loop ()
{
// Button press changes the frequency change step for 1 Hz steps
if (get_button ())
{
Note the open bracket under void.
Vince.
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On 06/06/2017 05:54 PM, Toni Cossio wrote: */Void loop ()
// Button press changes the frequency change step for 1 Hz steps
If (get_button ())
{/*
--
Michigan VHF Corp.
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Re: Dhl customs cost to the usa
The tax structure of the European countries and the USA are very different. Much of Europe collects duties for non European purchases. I have made hundreds of off shore purchases without paying any import tax. You have to chose between taxes and big government or the opposite. Oh and companied that.act as tax collecters for profit. Steve kb1chu
Sent from my Smart Phone I said I'd never get.
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-------- Original message -------- From: Vince Vielhaber <vev@...> Date: 6/6/17 2:13 PM (GMT-04:00) To: [email protected] Subject: Re: [BITX20] Dhl customs cost to the usa I got mine about a week or so ago, shipped to the US.? I selected DHL since I've used them for many other imports.? There was no customs fee. What I paid hfsigs is all I paid - the $59 + $10 for DHL. Vince. > For my first BITX40 with India post to Sweden there where no custom cost. > > For my second BITX40 ??I used ??DHL. > > They take 28$ as custum fee ! > > Do not use DHL if you can wait som days ! > > SM6ERS ??/Ingvar > -- ?? Michigan VHF Corp.?? http://www.nobucks.net/?? http://www.CDupe.com/ ?????????????? http://www.metalworkingfun.com
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Dear PA3FAT,
I followed your advice by entering the Si5351 library in version 1.1.2
Now the program stops at this location:
Void loop ()
// Button press changes the frequency change step for 1 Hz steps
If (get_button ())
{
Indicating the following error :
<Expected unqualified - id before "if">
You can help me, thank you
73 de IV3XHM, Toni
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Re: Europe to States BitX QSO
Hi Willy,
OK, see you tomorrow 03-04 UTC, I will call cq cw around 7032khz and after we can try SSB. Will send you mail tomorrow when I start or will spot on Cluster.
Now I TX-ing WSRP to west... check conditions :)
73,
Good Luck,
CUL,
Andy 9a3jh
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On Tuesday 06 June 2017 05:51 PM, Willy wrote: Hi Andy, Thanks for reply.Lets try CW & SSB. SSB will be the real test. What frequency do your phased verticals like? I do not have my Moxon up and my inverted v is tuned for upper end of 40m (7.3MHz) but I can use it anywhere on 40. I will listen from 0300z to 0400z and watch my email or DXSUMMIT for your freq. Where would you like to operate?
73, Willy
On Tue, Jun 6, 2017 at 6:23 AM, Andy <andy9a3jh@... <mailto:andy9a3jh@...>> wrote:
I don't believe VOACAP :) especially during Sunrise... so we can
try next days in my SR, about 03 UTC.
I prefer CW but OK also for LSB. I made many CW QRP QSO's with NA
stations before with K2(5W) and 2 el phased verticals.
Antenna's are still alive and last days sometimes transmitting
WSPR during night to west, about 15miliWatts with bitx +
attenuator + Raspberry PI. Received also few reports from USA :)
73,
9a3jh Andy
On Tuesday 06 June 2017 03:24 AM, Willy wrote:
VOACAP propagation tools give only about a 10% chance unless
high gain antennas are used. It looks like Spain might be the
best shot.
73 Willy
On Mon, Jun 5, 2017 at 5:35 PM, William Maclean <w1ly@...
<mailto:w1ly@...> <mailto:w1ly@...
<mailto:w1ly@...>>> wrote:
---------- Forwarded message ----------
From: *William Maclean* <w1ly@...
<mailto:w1ly@...> <mailto:w1ly@... <mailto:w1ly@...>>>
Date: Mon, Jun 5, 2017 at 4:43 PM
Subject: Europe to States BitX QSO
To: [email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>
I would like to complete a BitX/BitX QSO over the pond.
I have worked 30 DXCC entities SSB since I finished my
BitX40 in
April.
The farthest was ZS6CCY at 12,500km but
Most of those stations have BIG GUN antennas and I only
have an
inverted V at 18 m.
I will set up a 40 meter Moxon pointed at Europe if the
inverted v
is not enough
I think that the hour before sunrise at your location
would give
us the best chance.
If you have completed a BitX/BitX EU-USA QSO let me know
what worked.
If anyone has an interest in this test drop me a line.
73, Willy W1LY
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Craig,
The ceramic is used with the tuning pot. See the instructions at??? Step 3: Wire up the Raduino, connect the tuning pot --> solder the 0.1uF disc ceramic between the yellow and violet wires on the tuning pot.
I'm still trying to figure out what the surface mount cap is for...please do let me know if you find out!?
-Dan
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BITX QSO Night, Sunday, June 11, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
BITX QSO Night, Sunday, June 11, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
Join us as we make contacts from BITX40 to BITX40 on 7.277 MHz in 40 meters!
To participate, call CQ BITX at 7pm sharp, your local time, on Sunday. Call off and on for about 15 minutes. It is helpful if you call CQ BITX with your name and location.? Repeat your call a number of times if conditions are weak.
This is a worldwide event at 7pm in each time zone.? You may participate in any time zone, regardless of your location, so you may wish to call in at 6pm, 7pm and 8pm, your local time, to contact hams in adjacent time zones.
Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.
This is an undirected, scheduled event.? The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls at 7pm on Sunday.? Talk to you then!
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Re: Dhl customs cost to the usa
In many countries there is an option to self-clear your packages.? Most of DHLs fee is a brokerage fee.? See this article for ways to convince DHL to allow you to self clear. ?
On Jun 6, 2017 1:16 PM, "Vince Vielhaber" < vev@...> wrote:
I got mine about a week or so ago, shipped to the US.? I selected DHL
since I've used them for many other imports.? There was no customs fee.
What I paid hfsigs is all I paid - the $59 + $10 for DHL.
Vince.
> For my first BITX40 with India post to Sweden there where no custom cost.
>
> For my second BITX40 ?I used ?DHL.
>
> They take 28$ as custum fee !
>
> Do not use DHL if you can wait som days !
>
> SM6ERS ?/Ingvar
>
--
? ?Michigan VHF Corp.? ?? ?
? ? ? ? ? ? ? ?
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Re: Calling West Coast BITX operators
KG7SSB, Tucson Arizona Pima County
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Hi,
Has any one built Ashhar's agc circuit and had it work? Seems it adds at least 10k ohms between the audio out and the speaker, if I add that much resistance I get no sound out of my speaker. Maybe I don't understand where it is placed. Also in the photo it seems the exciter and collector of the 2n2222 or 2n3904 are switched relative to the schematic. Any help appreciated. I have not tried VK3YE's yet, though it seems it would add at least 4.7k
Thanks,
Jerry AA1OF
Sent from my iPad
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Re: Calling West Coast BITX operators
Elma WA (30 W of Olympia) I'm up for a BITX checkin :) -- Ryan Flowers W7RLF
?
?<-- Learn how to go digital on the BITX40
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Re: Dhl customs cost to the usa
I got mine about a week or so ago, shipped to the US. I selected DHL
since I've used them for many other imports. There was no customs fee.
What I paid hfsigs is all I paid - the $59 + $10 for DHL.
Vince.
toggle quoted message
Show quoted text
For my first BITX40 with India post to Sweden there where no custom cost.
For my second BITX40 ??I used ??DHL.
They take 28$ as custum fee !
Do not use DHL if you can wait som days !
SM6ERS ??/Ingvar
--
Michigan VHF Corp.
|
Re: Dhl customs cost to the usa
For my first BITX40 with India post to Sweden there where no custom cost.
For my second BITX40 ?I used ?DHL.
They take 28$ as custum fee !
Do not use DHL if you can wait som days !
SM6ERS ?/Ingvar
|
Re: Low mic gain and rf power
Hi Jirka,
I like case setup. What are the functions of all the red buttons. Assuming one is function and another can be calibration, I'm curious what the other are for.?
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On Jun 6, 2017, at 6:29 AM, Jirka < OK1IEC@...> wrote: Hello everybody.
?
My name is Jirka, callsign OK1IEC, and I am new in the group. Recently I bought BITX40v3 and built it in the Al box. RX is ok, comparable? with my K2 in normal conditions. The problem is with transmitting ¨C I am not able to reach more than about 1W of output power shouting very loudly into electret mike. Mike change does not help, pot R136 is in the full gain position.
I? decided to do some measurements: I? used Audacity software to produce 1 kHz audio and connected it to Mic pins of BITX40 via 47uF capacitor.? I need 280mV p-p AF signal to get 6W RF output power on my dummy load.
AF signal levels:?? Mic (C121): 280 mV p-p;? C122: 410 mV p-p
RF signal levels: C132: 1.3V p-p;? C134: 3.45V p-p;? C141: 3.25V p-p; C152: 8.6V p-p; C155: 51V p-p; Antenna: 50V p-p.
It seems the RF chain is ok but? AF stage Q12 has suspectly low gain. Components seem to be ok, Q12 Uc=10V, Ue=2.26V
Any idea or advice appreciated. ?
73! Jirka
?
Trafo T4 in BFO mixer ??? BTW I see the difference between schematic (D15, D16, R106) and real components on the pc board.
<IMG_20170605_191003low.jpg>
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Re: Calling West Coast BITX operators
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Re: Calling West Coast BITX operators
VE7BOX, Lorne in Clearwate4r B.C.
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Re: Calling West Coast BITX operators
KD5WQD, near Albuquerque, NM (BITX20, but not 40)
Sent from my iPhone
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On Jun 5, 2017, at 7:55 PM, Jonathan Peakall <jpeakall@...> wrote:
Hi All,
Just curious, how many West Coast BITX operators are on this list? Anywhere on the left side of the country. If you don't mind, sound off with your state and town. I'll compile a list from the responses. I have three plus myself that I know personally:
WB0NPM - Escondido CA
KE7RTV - Sparks, NV
W7LTG - Spanish Springs, NV
KK6RPX, Albion CA
Thanks!
Jonathan - KK6RPX
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Re: Conflicting information
While not easy, you could use Vin on the Nano board to supply an external 7-20V to the Nano. Attached is a picture of a small board that does a little processing on the power before it goes to the Mega 2560 Vin. The red and black leads barely visible on the right come from the input PS source. I will likely run my B40 at 13.8V most of the time, as that's what my external PS is set at. The two yellow and black pins on the right side of the regulator pull that voltage off for the PA and (maybe) a fan. The yellow and black pins on the left go to the power connection on the TFT/VFO board. That board uses a buck converter to drop the voltage down to 7.6V, which goes to Vin of the Mega. The Mega provides the 3.3V and 5V needed by the rest of the board (i.e., the Ad9850 and the TFT display). A test with some suspect test equipment suggests the board draws about 25mA.
Jack, W8TEE
From: Dr Fred Hambrecht <AAR4MI@...>
To: [email protected]
Sent: Thursday, June 1, 2017 3:02 AM
Subject: Re: [BITX20] Conflicting information
Not the same as the as the 328. There is no 12 volt connector on the Raduino processor. There is on the R3 or 2560. The information you supplied refers to them. The 328 is powered from the 5 volt regulator on the Raduino board OR the USB connection. No automatic selection exists on? the Raduino. ? v/r Fred W4JLE ? ? Let's see if I can help. The Arduino site says this.- The Arduino/Genuino Uno board can be powered via the USB connection or with an external power supply. The power source is selected automatically. External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the GND and Vin pin headers of the POWER connector. The board can operate on an external supply from 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may become unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.
Automatically selected are the key words here. I had an UNO die because I plugged in the usb while it was already powered by DC jack.?This might have been a cheap chinese clone issue. I would advise against any DC power when connecting the Raduino for programming. The USB port has plenty of power for the Raduino.?
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Re: Bitx 40 Transformer windings
He's way ahead of you.
T1-T7 plus all the other inductors are described at the bottom of this webpage: ??
Jerry, KE7ER
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On Mon, Jun 5, 2017 at 04:38 pm, KM4TRT wrote:
Ashar, can you publish the windings for Transformers T1-T7.
?
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ekelley
