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IRF510- Temporary replacement?

 

Hi all,

I blew out the IRF510 (still not completely sure how- might have been because I was doing WSPR with 19v on the PA?) and so while I source a replacement, can anyone suggest any other transistor/fet that can be used in its place? I don't care if it puts out only a 100mw, that's okay with me- I just want to be able to transmit in any capacity. I have some NPN and PNP transistors about and am wondering if one of those would be workable. Thanks :)

--
Ryan Flowers W7RLF

?

?<-- Learn how to go digital on the BITX40
Re: Raduino error to solve

 

Vince,
Many thanks,
I will try with your directions.
I hope this is the reason for the mistake.
However the following is the final part:
// Button press changes the frequency change step for 1 Hz steps
?
? if (get_button())
? {
?
? switch (radix)
? {
? ? case 1:
? ? ? radix = 10;
? ? ? break;
? ? case 10:
? ? ? radix = 100;
? ? ? break;
? ? case 100:
? ? ? radix = 1000;
? ? ? break;
? ? case 1000:
? ? ? radix = 10000;
? ? ? break;
? ? case 10000:
? ? ? radix = 100000;
? ? ? break;
? ? case 100000:
? ? ? radix = 1;
? ? ? break;
? }
? display_radix();
}
}

73 de IV3XHM, Toni
Re: Raduino error to solve

Vince Vielhaber
 

Here's with line numbers.

1 void loop ()
2 {
3 // Button press changes the frequency change step for 1 Hz steps
4 if (get_button ())
5 {

Look at line 2. Compare it to your sketch. Do you have that { there? If not, add it and try uploading again.

NOTE: there is another one at line 5, I'm not talking about that one. Just the one on line 2.

Vince.

On 06/06/2017 06:30 PM, Toni Cossio wrote:
Vince,
Many thanks but I can not find or understand how much you tell me.
Your indication seems to me the same as my sketch (?)
--
Michigan VHF Corp.

Re: Low mic gain and rf power

Vince Vielhaber
 

I thought I was having the same problem, but it turns out I wasn't. I use a Motorola Service Monitor for the dummy load and power meter and thought it was in dBm where it was actually in watts. I thought 14.1 dbm, that sucks. But it was really 14.1 watts.

Anyway, while I was troubleshooting I was able to confirm the same RF levels (plus/minus a bit) except, of course, the output level was a lot more.

Moving to the AF levels, I didn't measure past the mic. At the mic connector I'm getting around 3Vpp or more with the mic that's included in the kit. So you may want to start with the mic circuit. BTW, that 3Vpp was me just saying HELLOOOOOOOOOOOOOOO into the mic as measured on a Tektronix 2430A scope.

Vince.

On 06/06/2017 06:13 PM, ekelley wrote:
I have the same problem with 2 of my Bitx40's.
Ed W0OIC

On 6/6/2017 5:29 AM, Jirka 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.


--
Michigan VHF Corp.

Re: No sound

Matt Patterson
 

Did this and still it even a hint of sound. Tried a different speaker too that I know works. Frustrating....

At this point I'm going chalk it up to lesson learned. I thought this would be a fun build but it's turned into another headache that I don't need right.

73 Matt
W5LL

Sent from my iPhone 7

On Jun 6, 2017, at 5:39 AM, Raj vu2zap <rajendrakumargg@...> wrote:

Matt,

Check the speaker first with your meter on continuity / beeper setting.

Your volume control may be the problem. Just short the brown and red wires and see with volume set at max.
Mine packed up when I tried to tin the leads!

Raj

At 06-06-2017, you wrote:
First time builder here. Got my bitx40 all together. The unit powers up but I hear no static. The instructions say I should hear a low hiss even without it connected to an antenna. I hear nothing. Anyone have an idea on where to start? Failing that, anyone want a project? I should just stick to built rigs. I have poor eyesight and suffer from headaches all the time so I'm sure it's something I did. :(

73 Matt
W5LL
Re: Raduino error to solve

richard kappler
 

Nope, my mistake, need to stop reading code with the flu, parents are fine, curly braces are not.

On Jun 6, 2017 6:34 PM, "richard kappler" <richkappler@...> wrote:
And now that I look at it, an extra closing parentheses as well

On Jun 6, 2017 6:33 PM, "richard kappler" <richkappler@...> wrote:
Look at your curly braces. {

You only have one and it's in the wrong place (open in the close position). You need 2.

{
Code goes here
}

73, Richard W2KAP?

On Jun 6, 2017 6:30 PM, "Toni Cossio" <a.cossio@...> wrote:
Vince,
Many thanks but I can not find or understand how much you tell me.
Your indication seems to me the same as my sketch (?)



Re: Raduino error to solve

richard kappler
 

And now that I look at it, an extra closing parentheses as well

On Jun 6, 2017 6:33 PM, "richard kappler" <richkappler@...> wrote:
Look at your curly braces. {

You only have one and it's in the wrong place (open in the close position). You need 2.

{
Code goes here
}

73, Richard W2KAP?

On Jun 6, 2017 6:30 PM, "Toni Cossio" <a.cossio@...> wrote:
Vince,
Many thanks but I can not find or understand how much you tell me.
Your indication seems to me the same as my sketch (?)


Re: Raduino error to solve

richard kappler
 

Look at your curly braces. {

You only have one and it's in the wrong place (open in the close position). You need 2.

{
Code goes here
}

73, Richard W2KAP?

On Jun 6, 2017 6:30 PM, "Toni Cossio" <a.cossio@...> wrote:
Vince,
Many thanks but I can not find or understand how much you tell me.
Your indication seems to me the same as my sketch (?)


Re: Raduino error to solve

 

Vince,
Many thanks but I can not find or understand how much you tell me.
Your indication seems to me the same as my sketch (?)
Re: Low mic gain and rf power

 

¿ªÔÆÌåÓý

I have the same problem with 2 of my Bitx40's.
Ed W0OIC

On 6/6/2017 5:29 AM, Jirka 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.
300Km with a bicycle and my Bitx40

Julien NICOLAS
 

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
Re: Raduino error to solve

Vince Vielhaber
 

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.

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.

Re: Dhl customs cost to the usa

Steve Black
 

¿ªÔÆÌåÓý

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.


-------- 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
Raduino error to solve

 

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
Re: Europe to States BitX QSO

Andy
 

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

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
Re: Coils and caps

[email protected]
 

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
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!
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.? ?? ?
? ? ? ? ? ? ? ?
Re: Calling West Coast BITX operators

Dale Brooks KG7SSB
 

KG7SSB, Tucson Arizona Pima County
VU2ESE Agc circuit

 

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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