¿ªÔÆÌåÓý

Date

Re: Bitx 20 help #w8tee

 

Thanks


Re: Bitx 20 help #w8tee

Vince Vielhaber
 

I look on ebay and don't have a lot of luck with that. Hopefully someone
else will have a good source.

Vince - KA8CSH

How can I get a good gt37-43, could you help me with this?
--
Michigan VHF Corp.


Re: Constant volume/AGC

 

Lots more info and articles here!



In the last 40+ years I have tried photodiode, fet, ldr and even the NE570.
I still have one of my variable DBX units!

At 01/06/2017, you wrote:
From NUTS and VOLTS


Re: Bitx 20 help #w8tee

 

How can I get a good gt37-43, could you help me with this?


Re: Bitx 20 help #w8tee

 

How can I get a good t50-37, could you help me with this?


Re: Bitx 20 help #w8tee

Vince Vielhaber
 

According to toroids.info 8 turns on a T50-37 core is 28.16uH. To get
28.16uH on a T50-2 core you'd need 76 turns.

Thanks Bill Meara, lm386 I will check, I live in turkey, t50-2 I use
thyroid, 73
Vince.
--
Michigan VHF Corp.


Re: Bitx 20 help #w8tee

 

Thanks Bill Meara, lm386 I will check, I live in turkey, t50-2 I use thyroid, 73


Re: Bitx 20 help #w8tee

 

Your BITX 20 board looks very nice.?? If you are hearing a whistling sound on receive, your audio amplifier might be oscillating.? Check the grounding on the LM386.?

One other thing I notice from the photo:? I like your toroidal coils and I often use insulated wire as you have done.? But you wound the coils on red T-50-2 cores.?? I think you need ferrite cores that will result in higher inductance.? Type 43 material is usually used.?? If you need some, I can send some to you (Farhan gave me a bunch of these).? Let me know.?? (Where are you?0

Don't give up!? You are close to getting a wonderful rig on the air.

73? Bill N2CQR


On Thursday, June 1, 2017 6:10 AM, huseyin.guner via Groups.Io <huseyin.guner@...> wrote:


Hi, I decided to do Bitx20, I use 10 MHz xtal, card is over and I get energy, whistling, what could be the problem.Nobin was wrapped with 8 rounds t50-2



Bitx 20 help #w8tee

 

Hi, I decided to do Bitx20, I use 10 MHz xtal, card is over and I get energy, whistling, what could be the problem.Nobin was wrapped with 8 rounds t50-2


Re: Constant volume/AGC

Weddig, Henning-Christof
 

complete link:

----- Original Message -----
From: "Allard PE1NWL" <pe1nwl@...>
To: [email protected]
Sent: Thursday, 1 June, 2017 11:06:17
Subject: Re: [BITX20] Constant volume/AGC

that link seems to be broken...

On Thu, June 1, 2017 10:58, Henning Weddig via Groups.Io wrote:
please have a loog on

www.arrl.org/files/file/QEX...Oct.../Anderson%20Sept-Oct.pdf

Henning

DK5LV


Re: Constant volume/AGC

Weddig, Henning-Christof
 

I copied this link from Google, after inserting qex Audio agc

the full article is named:

synthesing an Audio AGC circuit

Phil Andedrson W0XI

published in the QEX Sept Oct 2010

Henning

----- Original Message -----
From: "Allard PE1NWL" <pe1nwl@...>
To: [email protected]
Sent: Thursday, 1 June, 2017 11:06:17
Subject: Re: [BITX20] Constant volume/AGC

that link seems to be broken...

On Thu, June 1, 2017 10:58, Henning Weddig via Groups.Io wrote:
please have a loog on

www.arrl.org/files/file/QEX...Oct.../Anderson%20Sept-Oct.pdf

Henning

DK5LV


Re: Constant volume/AGC

 

that link seems to be broken...

On Thu, June 1, 2017 10:58, Henning Weddig via Groups.Io wrote:
please have a loog on

www.arrl.org/files/file/QEX...Oct.../Anderson%20Sept-Oct.pdf

Henning

DK5LV


Re: Constant volume/AGC

 

¿ªÔÆÌåÓý

please have a loog on

Henning

DK5LV


Am 01.06.2017 um 09:58 schrieb Ashhar Farhan:

this can be done much easier with a 2N7000 as it doesn't need -ve bias of the JFET. I don't know if you have seen the AGC circuit in the BITX hacks

- f

On Thu, Jun 1, 2017 at 12:58 PM, Raj vu2zap <rajendrakumargg@...> wrote:
From NUTS and VOLTS

?



Re: Foreign orders #w8tee

 

Another easy way out, we investigated it for BITX boards as well, is to use fulfillment by amazon (FBA for amazon citizens).

- f

On Thu, Jun 1, 2017 at 4:07 AM, William R Maxwell <wrmaxwell@...> wrote:

I would be happy to hold some local stock and then handle orders from Australia and say New Zealand or other Pacific destinations at cost. The Australian Customs declaration is relatively simple and can be hand-filled, with the Post Office happy to give me a supply of blank forms.

I have handled a number of international group purchases this way.

Bill, VK7MX


On 1/06/2017 7:47 AM, Jack Purdum via Groups.Io wrote:
These are good ideas. I'll investigate this further...thanks!!

Jack, W8TEE



From: Graham <planophore@...>
To: [email protected]
Sent: Wednesday, May 31, 2017 5:32 PM
Subject: Re: [BITX20] #W8TEE Foreign orders

Jack,

a couple of thoughts,

1) put your design on oshpark as a shared project. Others could then order (in multiples of three) at a reasonable price.

2) contact Hans Summer G0UPL ( I seem to recall he is a member of this group) who runs he may have some good ideas on how to better do what you are trying to do.

Either way, your commitment to providing these boards at a reasonable cost is commendable

Cheers, Graham ve3gtc



On 2017-05-31 19:30, Jack Purdum via Groups.Io wrote:
All:

I just spent an hour at the post office while they processed each foreign order. Last night I spent another several hours filling out export/customs forms. Potentially, each country charges a different amount on packages to their country. Because the PCB "cannot be bent during processing", it has to be sent parcel post, rather than first class mail, which is much more standardized. The cheapest rate was over $9 to Canada and the most expensive were several European countries just under $15! I was stunned. I still sent the packages, but everyone in Europe only has a $2.62 credit as that's what I assumed the charge would be plus a little more. I told people read the postage cost on the outside and remit that amount less $2.62 since you've already paid that. In most cases, that make the board stupidly expensive.

If the European Union has one rate for parcels, my solution is to sell a bunch of boards to one place in the Union and let people order from them. Same for the Pacific Rim. Another solution is to find someone who likes waiting in post offices and filling out forms and let them handle the foreign orders. The third alternative is to not take foreign orders, but that's unacceptable to me.?

So, if you have some great idea for solving this problem, please write me off-line so we don't chew up bandwidth here. I'm good in QRZ.com. If something looks like it will work, I'll inform the group.

Also, I'll post to the group when the new shipment of boards comes in.

Jack, W8TEE


Groups.io Links:








Re: Constant volume/AGC

 

this can be done much easier with a 2N7000 as it doesn't need -ve bias of the JFET. I don't know if you have seen the AGC circuit in the BITX hacks

- f

On Thu, Jun 1, 2017 at 12:58 PM, Raj vu2zap <rajendrakumargg@...> wrote:
From NUTS and VOLTS

?



BiDi audio amp

 


More than a couple of decades ago I was working on a rural radio project and I built something like this.
This can be used in Bitx for mic and amp with no switching voltages required. T1 is also not needed as
we don't need electrical isolation.

Emacs! ?


Re: W8TEE TFT/VFO Board from FDIM talk

 

Hi Kevin

I find that most stuff arrives within 10-15 days

73 de Charlie GI4FUE

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Kevin Gilot
Sent: 01 June 2017 00:48
To: [email protected]
Subject: Re: [BITX20] W8TEE TFT/VFO Board from FDIM talk

Hi Charlie, What was the shipping time to get your stuff? I don't really
want to wait a month or more.

Thanks and 73,

Kevin NZ1I
Mystic, CT

Sent from my iPhone




---
This email has been checked for viruses by AVG.


Constant volume/AGC

 

From NUTS and VOLTS

?


Re: Conflicting information

 

¿ªÔÆÌåÓý

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

?

From: [email protected] [mailto:[email protected]] On Behalf Of John Smith via Groups.Io
Sent: Wednesday, May 31, 2017 18:58
To: [email protected]
Subject: Re: [BITX20] Conflicting information

?

Let's see if I can help. The Arduino site says this.-

Power

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.?


Bitx 20 help #bitx20help

 

Hi, I decided to do Bitx20, I use 10 MHz xtal, card is over and I get energy, whistling, what could be the problem. Nobin was wrapped with 8 rounds t50-2, thank you.