BITX20@groups.io | Messages

Re: Source of LDR required.

ken barnes

#27166

check out ebay ?loads of on there

On Saturday, 27 May 2017, 20:26, philip yates <phil@...> wrote:

Is there a part number to look for, as there seems to be quite a few around.

Phil - G7BZD

Show quoted text

On Sat, May 27, 2017 at 2:34 PM, Raj vu2zap <rajendrakumargg@...> wrote:

As far as LDR's are concerned, use the same value in ohms in the same size.

At 27-05-2017, you wrote:
>I am trying to get the parts together for the VK3YE AGC, and I am having trouble sourcing the LDR,
>does anyone have the details of a supplier that is suitable, or can I use any? LDR ?
>
>Thanks
>
>Phil - G7BZD

Re: Source of LDR required.

Vince Vielhaber

#27165

In trying to figure out what you guys were referring to I did some digging and the one thing I did find was a blog post saying that a 40k-400k LDR that he had on hand didn't work.  But one that went from a few K to about 40k was fine.

Vince.

Show quoted text

On 05/27/2017 04:29 PM, Jack Purdum via Groups.Io wrote:
Also note that Peter encased the LED and LDR in electrical tape before
he actually used it. I think shrink tubing would also work. I, too,
believe any LDR would work.

Jack, W8TEE


------------------------------------------------------------------------
*From:* Daniel Isaza <hk4dei@...>
*To:* [email protected]
*Sent:* Saturday, May 27, 2017 4:20 PM
*Subject:* Re: [BITX20] Source of LDR required.

I'd say just about any LDR will work, go ahead and try that circuit
using what you have at hand, experiment, be safe, and overall, have fun!
73
Dan
HK4DEI

On Sat, May 27, 2017 at 7:49 AM, philip yates <phil@...
<mailto:phil@...>> wrote:

    I am trying to get the parts together for the VK3YE AGC, and I am
    having trouble sourcing the LDR,
    does anyone have the details of a supplier that is suitable, or can
    I use any  LDR ?

    Thanks

    Phil - G7BZD

-- 
  Michigan VHF Corp.      
                          

Re: Source of LDR required.

philip yates

#27164

I will be using sleeving, not tape.

Thanks?

Phill - G7BZD

Show quoted text

On Sat, May 27, 2017 at 9:29 PM, Jack Purdum via Groups.Io <econjack@...> wrote:

Also note that Peter encased the LED and LDR in electrical tape before he actually used it. I think shrink tubing would also work. I, too, believe any LDR would work.

Jack, W8TEE

From: Daniel Isaza <hk4dei@...>
To: [email protected]
Sent: Saturday, May 27, 2017 4:20 PM
Subject: Re: [BITX20] Source of LDR required.

I'd say just about any LDR will work, go ahead and try that circuit using what you have at hand, experiment, be safe, and overall, have fun!
73
Dan
HK4DEI

On Sat, May 27, 2017 at 7:49 AM, philip yates <phil@...> wrote:
I am trying to get the parts together for the VK3YE AGC, and I am having trouble sourcing the LDR,
does anyone have the details of a supplier that is suitable, or can I use any ?LDR ?

Thanks

Phil - G7BZD

Re: Source of LDR required.

Jack Purdum

#27163

Also note that Peter encased the LED and LDR in electrical tape before he actually used it. I think shrink tubing would also work. I, too, believe any LDR would work.

Jack, W8TEE

Show quoted text

From: Daniel Isaza <hk4dei@...>
To: [email protected]
Sent: Saturday, May 27, 2017 4:20 PM
Subject: Re: [BITX20] Source of LDR required.

I'd say just about any LDR will work, go ahead and try that circuit using what you have at hand, experiment, be safe, and overall, have fun!
73

Dan

HK4DEI

On Sat, May 27, 2017 at 7:49 AM, philip yates <phil@...> wrote:

I am trying to get the parts together for the VK3YE AGC, and I am having trouble sourcing the LDR,
does anyone have the details of a supplier that is suitable, or can I use any ?LDR ?

Thanks

Phil - G7BZD

Re: Source of LDR required.

philip yates

#27162

off to e-bay then, as its one of the few components i do not have.

Thanks

Phil - G7BZD

Show quoted text

On Sat, May 27, 2017 at 9:20 PM, Daniel Isaza <hk4dei@...> wrote:

I'd say just about any LDR will work, go ahead and try that circuit using what you have at hand, experiment, be safe, and overall, have fun!
73
Dan
HK4DEI

On Sat, May 27, 2017 at 7:49 AM, philip yates <phil@...> wrote:
I am trying to get the parts together for the VK3YE AGC, and I am having trouble sourcing the LDR,
does anyone have the details of a supplier that is suitable, or can I use any ?LDR ?

Thanks

Phil - G7BZD

Re: doTuning() mod, utility, vanity

Jack Purdum

#27161

All:

In Allard's defense, it's even worse than he's letting on. Using 87% of the Flash memory is running on the edge, but is probably okay. The really scary statistic is the 74% on the SRAM memory. Recall that all of the data is stored in SRAM and the 74% number is the compile-time use statistic, not the run-time use. As the program runs and functions are called, each of which likely passes more data to the function during the call, the stack memory, which is part of SRAM, is getting skinnier and skinner. Think of a stack of dinner plates. The bottom of SRAM is called the "heap" and that were the global data are stored. So Allard may have several hundred plates at the bottom of the stack already used (i.e., dirty dinner plates!). As temporary data are define in functions and during calls, plates are removed from the stack and used...the unused stack of plates is getting skinnier. That 74% figure is the picture of the dinner plate stack before the restaurant doors are even opened...it's a compile-time statistic. When the program runs, it's like opening the restaurant doors to a bunch of football teams.?

My own experience was that I started getting erratic behavior when I was running around 72% of SRAM memory for one of my programs. (I was using some large graphics temporary variables in SRAM.) What Allard has shoehorned into the Nano is amazing. So, don't let those percentages fool you. He been doing a tight rope act over the Grand Canyon for quite some time now.

Jack, W8TEE?

Show quoted text

From: Allard PE1NWL <pe1nwl@...>
To: [email protected]
Sent: Saturday, May 27, 2017 3:48 PM
Subject: Re: [BITX20] doTuning() mod, utility, vanity

Paul,

your idea is a "nice-to-have" one, but unfortunately we're running out of
memory:

original sketch v1.13:

Sketch uses 26886 bytes (87%) of program storage space. Maximum is 30720
bytes.
Global variables use 1521 bytes (74%) of dynamic memory, leaving 527 bytes
for local variables. Maximum is 2048 bytes.

updated sketch:

Sketch uses 26944 bytes (87%) of program storage space. Maximum is 30720
bytes.
Global variables use 1555 bytes (75%) of dynamic memory, leaving 493 bytes
for local variables. Maximum is 2048 bytes.
Low memory available, stability problems may occur.

It's caused by the 3 printLine2 commands that consume a lot of RAM.

73 Allard PE1NWL

Re: Source of LDR required.

#27160

I'd say just about any LDR will work, go ahead and try that circuit using what you have at hand, experiment, be safe, and overall, have fun!
73

Dan

HK4DEI

Show quoted text

On Sat, May 27, 2017 at 7:49 AM, philip yates <phil@...> wrote:

I am trying to get the parts together for the VK3YE AGC, and I am having trouble sourcing the LDR,
does anyone have the details of a supplier that is suitable, or can I use any ?LDR ?

Thanks

Phil - G7BZD

Re: W8TEE Orders Foul-up

Vince Vielhaber

#27159

Google does a much better job, BUT, pay attention to your spam folder for false positives (aka legit mail).

Vince.

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On 05/27/2017 03:20 PM, Jack Purdum via Groups.Io wrote:
All:

I managed to process about 20 orders out of perhaps 60 and Yahoo mail
kicked me off. I tried to log in again and they say they have no record
of W8TEEB40@... <mailto:W8TEEB40@...>. Well, Yahoo has
screwed the pooch one too many times. If you did not get a confirmation
email with the subject line "Order" today, your order is in the Yahoo
mail system...somewhere. Please resend it. Those who did get a
confirmation will have their orders mailed out on Tuesday. (Monday is a
holiday.)

This time, include your address where you would like the package sent
and the number of boards you want. Please note that I have checked the
postage cost which was higher than expected ($2.62 instead of $0.72), so
I raised the board cost to $7.50 postpaid. No extra postage charge for
up to 4 boards.

The new email address is:

   W8TEEB40@... <mailto:W8TEEB40@...>

Hopefully Google will do a better job.

Jack, W8TEE

-- 
  Michigan VHF Corp.      
                          

Re: 10 turn pot $1 to way too much

OZ9AEW

#27158

I pay about 2 USD for a " Mexico" 10 turn incl. shipping on Ebay

Re: W8TEE TFT/VFO Board from FDIM talk

Jack Purdum

#27157

The parts list document suggests where to get parts for the TFT board. The place where you can save some noticeable cash is on the Mega 2560 Pro Mini, the AD9850 module, the TFT display, and the KY040 (threaded shaft) encoders. For these parts, write to an eBay vendor, tell them how many you want to order, and say you're willing to pay XX dollars for them, postpaid to your address. Many will work with you on the price. Tayda Electronics has a distribution facility on Livingston, CO, so things arrive fairly quickly and their prices are good, even quantity 1. For caps and resistors, I'd buy an assortment on eBay. 2600 resistors @ 20 like values works out to less than a half penny each. 1000 caps #20 like values for $7; still less than a penny each. Tayda sells resistors and capacitors for about a penny each, quantity 1. Doing a club build or a co-op like Kevin is talking about can save some cash on the build.

Jack, W8TEE

Show quoted text

From: Kevin Gilot <kevinemtid@...>
To: [email protected]
Sent: Saturday, May 27, 2017 3:20 PM
Subject: Re: [BITX20] W8TEE TFT/VFO Board from FDIM talk

Hi Folks, I am just wondering how you all are going to source parts for this build?

I'm not sure you can them all at one source but that would make it alot easier. Anyway, please pass along your suggestions and maybe someone could make a group buy. I Might be willing to handle it.

73, Kevin NZ1I

Sent from my iPhone

Re: doTuning() mod, utility, vanity

#27156

Paul,

your idea is a "nice-to-have" one, but unfortunately we're running out of
memory:

original sketch v1.13:

Sketch uses 26886 bytes (87%) of program storage space. Maximum is 30720
bytes.
Global variables use 1521 bytes (74%) of dynamic memory, leaving 527 bytes
for local variables. Maximum is 2048 bytes.

updated sketch:

Sketch uses 26944 bytes (87%) of program storage space. Maximum is 30720
bytes.
Global variables use 1555 bytes (75%) of dynamic memory, leaving 493 bytes
for local variables. Maximum is 2048 bytes.
Low memory available, stability problems may occur.

It's caused by the 3 printLine2 commands that consume a lot of RAM.

73 Allard PE1NWL

Re: Source of LDR required.

philip yates

#27155

Is there a part number to look for, as there seems to be quite a few around.

Phil - G7BZD

Show quoted text

On Sat, May 27, 2017 at 2:34 PM, Raj vu2zap <rajendrakumargg@...> wrote:

As far as LDR's are concerned, use the same value in ohms in the same size.

At 27-05-2017, you wrote:
>I am trying to get the parts together for the VK3YE AGC, and I am having trouble sourcing the LDR,
>does anyone have the details of a supplier that is suitable, or can I use any? LDR ?
>
>Thanks
>
>Phil - G7BZD

W8TEE Orders Foul-up

Jack Purdum

#27154

All:

I managed to process about 20 orders out of perhaps 60 and Yahoo mail kicked me off. I tried to log in again and they say they have no record of W8TEEB40@.... Well, Yahoo has screwed the pooch one too many times. If you did not get a confirmation email with the subject line "Order" today, your order is in the Yahoo mail system...somewhere. Please resend it. Those who did get a confirmation will have their orders mailed out on Tuesday. (Monday is a holiday.)

This time, include your address where you would like the package sent and the number of boards you want. Please note that I have checked the postage cost which was higher than expected ($2.62 instead of $0.72), so I raised the board cost to $7.50 postpaid. No extra postage charge for up to 4 boards.?

The new email address is:

? ?W8TEEB40@...

Hopefully Google will do a better job.

Jack, W8TEE

Re: W8TEE TFT/VFO Board from FDIM talk

#27153

Hi Folks, I am just wondering how you all are going to source parts for this build?

I'm not sure you can them all at one source but that would make it alot easier. Anyway, please pass along your suggestions and maybe someone could make a group buy. I Might be willing to handle it.

73, Kevin NZ1I

Sent from my iPhone

10 turn pot $1 to way too much

#27152

Any recommendations on what 100k pots to buy or even better which pots not to buy given the extreme price differences.

Thanks, Willy W1LY

doTuning() mod, utility, vanity

#27151

A few simple mods to the sketch in the doTuning function can add some utility and a little vanity.? doTuning() is near the end of the sketch.

1. Add a line to print left or right arrows to show when the tuning is in shift mode at the far ends of the tuner????? printLine2((char *)"<<<<<<<<<<????? ");

2. Increase the delay in milliseconds to allow for reaction to shift mode before it goes to far.????????? delay(400);

3. Add a line to print "BITX40 ** YOUR_CALL" that will show up whenever you are listening or tuning the dial.???????? printLine2((char *)"BITX40 ** KC8WBK");

The display will show 16 characters, so don't enter more than 16.
?
void doTuning() {

?

? long knob = knob_position(); // get the current tuning knob position

?

? // the knob is fully on the low end, move down by 10 Khz and wait for 200 msec
? if (knob < -80 && frequency > LOWEST_FREQ) {
??? baseTune = baseTune - 10000L;
??? frequency = baseTune + (50L * knob * TUNING_RANGE / 500);
??? printLine2((char *)"<<<<<<<<<<????? ");
??? updateDisplay();
??? setFrequency(frequency);
??? delay(400);
? }

?

? // the knob is full on the high end, move up by 10 Khz and wait for 200 msec
? else if (knob > 10120L && frequency < HIGHEST_FREQ) {
??? baseTune = baseTune + 10000L;
??? frequency = baseTune + (50L * knob * TUNING_RANGE / 500);
??? printLine2((char *)"????? >>>>>>>>>>");
??? setFrequency(frequency);
??? updateDisplay();
??? delay(400);
? }

?

? // the tuning knob is at neither extremities, tune the signals as usual ("flutter fix" by Jerry, KE7ER)
? else if (knob != old_knob) {
??? static byte dir_knob;
??? if ( (knob > old_knob) && ((dir_knob == 1) || ((knob - old_knob) > 5)) ||
???????? (knob < old_knob) && ((dir_knob == 0) || ((old_knob - knob) > 5)) )?? {
????? if (knob > old_knob) {
??????? dir_knob = 1;
??????? frequency = baseTune + (50L * (knob - 5) * TUNING_RANGE / 500);
????? }
????? else {
??????? dir_knob = 0;
??????? frequency = baseTune + (50L * knob * TUNING_RANGE / 500);
????? }
????? old_knob = knob;
????? setFrequency(frequency);
????? printLine2((char *)"BITX40 ** KC8WBK");
????? updateDisplay();
??? }
? }

?

? if (vfoActive == VFO_A)
??? vfoA = frequency;
? else
??? vfoB = frequency;
}

UECIDE

[email protected]

#27150

Hello All:

If you develop with a variety of microcontrollers, you might want to check out uecide.org(uecide dot org).

It has plug-ins for many boards. I started out with chipKIT UNO 32s and have now added the Nano. I believe the ESP boards are also supported.

James
KE4MIQ

Re: Raduino_v1.13 with scan function released

Jack Purdum

#27149

The new features for AGC, CW mode, and speech compression do require minor mods on the board. The VFO and rotary encoder and CW messaging work now without mods. With minor changes you can use the keyer as a code practice oscillator, but that's an H-bomb to kill and ant approach to practice.

Jack, W8TEE

Show quoted text

From: Allard PE1NWL <pe1nwl@...>
To: [email protected]
Sent: Saturday, May 27, 2017 4:24 AM
Subject: Re: [BITX20] Raduino_v1.13 with scan function released

Wow that looks impressive Jack!

I haven't studied the manual yet (just looked through it briefly) but as I
understand it involves quite a few hardware mods.
Will your new code also still work on a standard unmodified BITX40 board?
Or is it a dedicated sketch for your mods?

73 Allard PE1NWL

On Sat, May 27, 2017 05:14, Jack Purdum via Groups.Io wrote:
> Allard:
> The mods I did, as described in the manual I sent out earlier today, does
> use a rotary encoder for tuning and other functions. I will be releasing
> that code next week.
> Jack, W8TEE

Re: New member intro

John

#27148

Thanks for the replies Jamie and Jerry. I'll look at the links you provided. This is my friend's first radio construction project although he's built electronic circuits before. I thought modular construction would be instructive, debugging stage-by-stage (if necessary) and we can always upgrade modules when the whole thing is working. I have a couple of Si5351 breakout boards bought at a rally and doing nothing. Using them we wouldn't have to worry about drift, and a digital display will be easy too.

I'll keep you informed of my (our) progress.

73,

John G4EDX

Show quoted text

On 27 May 2017 at 15:23, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

The BitX40 schematics up on are probably a good place to start, adjustments for 20m would be restricted to the BPF, the transit LPF, and the VFO.
You need to decide if you are going with an analog VFO, I'd suggest using an Si5351 for both VFO and BFO as is done on the uBitx: ?
In fact, not a bad idea to just go with the uBitx schematics, has a number of improvements over the Bitx.
The SBL-1's should work fine, though it's possible that building up from torroids and diodes could work slighty better as they don't need to work at 500mhz.
The 1n4148's should probably have more drive than they get on the Bitx.
The Bat54 schottky diodes on the uBitx have lower drive requirements, same as the SBL-1's at 7dBm into 50 ohms.
?

On Fri, May 26, 2017 at 11:39 am, John wrote:

I see that there are variants of the BITX20 on the web so I wonder whether anyone can recommend a particular circuit to follow. I have a good supply of iron dust toroids, 2N3904s and 2N2222s. I have a few SBL1s recovered from old boards. Are these much better than rings of 1N4148s?

?

?

?

W8TEE PCB shipping and order info

Jack Purdum

#27147

All:

?

Well, I was way off on the postage charges. Because it won't bend, I have to send it Parcel Post, which is $2.62 per package. The good news is that I can ship up to 4 boards at that price with no increase in postage. So, here's what I'm going to do: Each board is now $7.50 postpaid; I'll eat the difference. (The goal here is for you guys to start experimenting with the board, not make a profit, although I will still make a little on each board.) If you need more than 4 boards, either write me about it, or divide the order into lots of 4 boards each. There's no additional $0.20 charge per board.

Foreign customers: $7.50 per board. Whatever the postage charge is on the package, subtract $2.62 and send that to me after the order comes in. For example, if your package has $4.62 worth of postage on it, you should send me an additional $2.00. I don't know any other way to do it. All payments should be done with PayPal.

?

Write to me at?W8TEEB40@...?and tell me how many boards you need. In your order, be sure to include:

?

1. The number of boards you need

2. Your name and mailing address

3. The email address you want me to use for telling you if I have enough boards left

4. Are partial shipments okay (Yes, No). See below.

?

I will then write you back saying "Yes" I have the boards or "No" I don't have them. I will include my PayPal email address where you can make your payment. Once I'm notified of the payment, I'll send the boards. I will make "partial shipments" unless you say otherwise. That is, if you order 4 boards and I only have 2 left, I will tell you that and assume you want those 2 boards. If you say No on your first notification, that will allow me to sell the remaining boards to others who may want them.

?

Any questions use the highlighted email so we don't chew up the group's bandwidth. I will be uploading the assembly manual, BOM file, and schematic to the Files section.

?

Jack, W8TEE

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