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Re: Sourcing HF41 relays

 

If you search in AliExpress on HF41 relay hongfa, there are several links.

?
Re: Sourcing HF41 relays

 

When you click the link, the pictures of the relays appear for a split second, then it say cannot be found. Maybe they are out of stock.
Re: Sourcing HF41 relays

 

Link is broken...

Jack, W8TEE

On Saturday, May 24, 2025 at 01:56:59 PM EDT, Dave VE3LHO <dave@...> wrote:


I use this store on AliExpress
?
$44.58 for 50 relays with free delivery. Usually takes 1~2 weeks to arrive.
?
But YMMV, as they say.
?
On Fri, May 23, 2025 at 11:19 AM, David Dill wrote:

Builders,
?
Wonder what people are currently finding as the best source and price for the HF41F/12-ZS relays ?
?
Thanks and 72
David
WONP

--
Jack, W8TEE
Re: Sourcing HF41 relays

 

I use this store on AliExpress
?
$44.58 for 50 relays with free delivery. Usually takes 1~2 weeks to arrive.
?
But YMMV, as they say.
?
On Fri, May 23, 2025 at 11:19 AM, David Dill wrote:

Builders,
?
Wonder what people are currently finding as the best source and price for the HF41F/12-ZS relays ?
?
Thanks and 72
David
WONP
Re: Sourcing HF41 relays

 

¿ªÔÆÌåÓý

EBay. ? Cheapest. ?


Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

?

Owner - Operator

Big Signal Ranch ¨C K9ZC

Staunton, Illinois

?

Owner ¨C Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:??bill@...

?


On May 23, 2025, at 8:20?AM, David Dill via groups.io <dsdill@...> wrote:

?
Builders,
?
Wonder what people are currently finding as the best source and price for the HF41F/12-ZS relays ?
?
Thanks and 72
David
WONP
Sourcing HF41 relays

 

Builders,
?
Wonder what people are currently finding as the best source and price for the HF41F/12-ZS relays ?
?
Thanks and 72
David
WONP
New T41 site now available

 

Hi Everyone,
I have created, with Jack's help, a new site all about the T41-EP at:
?
This is an 'information and background site" for the T41, not an open forum - this site or the? SCHR groups.io site are the places for posting comments/suggestions about the T41.
?
I intend to post lots of photos of user-built T41 rigs. I have a few already included, but would like more. If I get enough, I will create a separate gallery page of just T41 builds.
Photos should be sent to me directly at albertfpeter@... with a brief explanation. I reserve the right to edit any comments for brevity.
Let me know what you think.
Regards,
Al Peter
AC8GY
?
Re: Just a few

 

¿ªÔÆÌåÓý

Hi Jack,
Please send the check to
Albert Peter
Stonehill Run
Cincinnati, Oh 45245
Thanks,
Al

From: [email protected] <[email protected]> on behalf of john mann via groups.io <jm.w1qz@...>
Sent: Wednesday, May 21, 2025 6:38 AM
To: [email protected] <[email protected]>
Subject: Re: [AmateurRadioBuilders] Just a few
?
Bill,
?
Please sent me one of the left over books. I've resisted but I need my fourth book that is up to date.
?
Thanks!
?
Jack Mann, W1QZ
13 York Dr
Coventry, RI 02816
Re: Just a few

 

Bill,
?
Please sent me one of the left over books. I've resisted but I need my fourth book that is up to date.
?
Thanks!
?
Jack Mann, W1QZ
13 York Dr
Coventry, RI 02816
Re: Back in the Saddle

 

Great advice Don!
?
Regards?
Phil
VK2KKZ
?
On Tue, May 20, 2025 at 11:52 AM, Donald S Brant Jr wrote:

I have found that transferring flux and solder paste from the larger stock syringes into smaller 1cc syringes makes the product easier to apply in controlled amounts and also keeps the stock syringe from drying out as quickly due to being opened less often. ?
Just connect the syringes together with a Luer-to-Luer adapter and load up as many small syringes as wanted, only takes seconds. ?
I when not using I store the material in the freezer in a sealed container to extend its shelf life.??
Solder paste is easier to apply using tapered plastic needles vs straight steel needles due to its viscosity, although you need to be careful with them around hot workpieces.? 18gauge seems best to me: ?
Steel needles are fine for flux, 22gauge, 1/2" long seems right: ?
?
73, Don N2VGU
Re: Checking my math

 

Thanks Bill
Makes sense.
?
Will update with results soon
?
David
W0NP
T41 books for sale - signed at Hamvention price

 

After HamVention, we have a few signed copies of the latest version left over. We are offering them for the HamVention price of $40.00 + USA shipping of $8 for USPS media rate. (a bit slower, but lots cheaper). Note: Amazon sells the non-signed copies for $5 more. Outside the US, international shipping rates apply.
?
If you want one, please:
  • Send a private note to me with your name, address and how you would like the book personalized (Name & Call) This will verify that we still have copies.
  • I will reply with mailing information
  • Then send a check for $48.00 to me at the address specified in the reply.
    ?We have limited quantities, so first come, first served.
We sold a bunch at FDIM and Hamvention, but some still remain.
Al?
AC8GY
Re: Back in the Saddle - soldering video

 

Also, most comes with a temperature regulated iron.

Jack, W8TEE

On Monday, May 19, 2025 at 10:08:10 PM EDT, Jay Bremner via groups.io <jaybremner@...> wrote:


?Nice video! Although you can buy a hot air rework station on Amazon for about $40. I have used that and also a toaster oven as a reflow oven and both work well.?

? Bonus to the hot air rework station is it is also great for heat shrink tubing.?

Best regards,
Jay Bremner
208.640.4878
jaybremner@...


On Mon, May 19, 2025 at 11:31?AM Lee Johnson via <lee47=[email protected]> wrote:


On Sunday, May 18, 2025 at 07:25:46 PM CDT, Jack, W8TEE via <jjpurdum=[email protected]> wrote:


This is a good video and should convince others that soldering SMD parts to a PCB isn't that tough. Keep in mind, this is a difficult part to solder to a board. By comparison, a 1206 SMD resistor or cap is child's play. This technique can also be used on the Si5351 which is probably one of the hardest parts to solder in the T41. If my fat fingers and poor eyes can do it, anyone can.

Jack, W8TEE

On Sunday, May 18, 2025 at 07:05:43 PM EDT, Phil Taylor via <philbyt1=[email protected]> wrote:


John
?
This may help. This guy uses an alternate method. Microscope is an absolute necessary item. One extra thing I do is add some flux paste to the chip edge before running the soldering iron along the pins to neaten and remove any bridges.
?
?
?
Regards?
Phil
VK2KKZ

--
Jack, W8TEE


--
Jack, W8TEE
Re: Checking my math

 

¿ªÔÆÌåÓý

It all looks right except your maximum power from the Hermes is 72 mW so that would be your reference.? What if you wanted to use the amp with your Hermes on 40M?? [72 mW ¨C 1 mW] is [17.5 dBm ¨C 0 dBm]¡­ so 17.5 dBm pad.? Now calculate your resistors¡­? That way it still works for 10M too.

?

?

Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

?

Owner - Operator

Big Signal Ranch ¨C K9ZC

Staunton, Illinois

?

Owner ¨C Operator

Villa Grand Piton ¨C J68HZ

Soufriere, St. Lucia W.I.

Rent it:

?

Moderator: North American QRO Group at Groups.IO.

Moderator: Amateur Radio Builders Group at Groups.IO.

?

email:? bill@...

?

?

From: [email protected] <[email protected]> On Behalf Of David Dill via groups.io
Sent: Monday, May 19, 2025 5:26 PM
To: [email protected]
Subject: [AmateurRadioBuilders] Checking my math

?

Hi all

?

I have just completed my first 20 amp build.?

This is my first foray into surface mount soldering and I think all has gone well.

Really cool stuff.

?

I am building this amp to accompany a Hermes Lite to turn it into a full 15w blowtorch.

The Hermes has an "RF Out" that bypasses the internal 5 Watt PA.

?

I have measured that output on all bands.

It ranges from 72mws on 10 meters

Down to 42mw on 40 meters.

?

My hunch is to calculate the Pi Attenuator for 41 mw.? Is that a good bet?

?

Here are my numbers - check me out and let me know what will be best.??

I failed Algebra 2 in High School.

?

?To attenuate 42 mw to 1mw, I need to attenuate 41mw or 16.12 db

?

The values I come up with are

68.5276

156.026

68.5276

?

So real values

68

160

68

?

Does this look right to you guys ?

What would you all suggest?

?

Thanks again for this great group.

Looking forward to building the T41 !

?

72 David

W0NP

?
Re: Back in the Saddle - soldering video

 

?Nice video! Although you can buy a hot air rework station on Amazon for about $40. I have used that and also a toaster oven as a reflow oven and both work well.?

? Bonus to the hot air rework station is it is also great for heat shrink tubing.?

Best regards,
Jay Bremner
208.640.4878
jaybremner@...


On Mon, May 19, 2025 at 11:31?AM Lee Johnson via <lee47=[email protected]> wrote:


On Sunday, May 18, 2025 at 07:25:46 PM CDT, Jack, W8TEE via <jjpurdum=[email protected]> wrote:


This is a good video and should convince others that soldering SMD parts to a PCB isn't that tough. Keep in mind, this is a difficult part to solder to a board. By comparison, a 1206 SMD resistor or cap is child's play. This technique can also be used on the Si5351 which is probably one of the hardest parts to solder in the T41. If my fat fingers and poor eyes can do it, anyone can.

Jack, W8TEE

On Sunday, May 18, 2025 at 07:05:43 PM EDT, Phil Taylor via <philbyt1=[email protected]> wrote:


John
?
This may help. This guy uses an alternate method. Microscope is an absolute necessary item. One extra thing I do is add some flux paste to the chip edge before running the soldering iron along the pins to neaten and remove any bridges.
?
?
?
Regards?
Phil
VK2KKZ

--
Jack, W8TEE

Re: Back in the Saddle

 

¿ªÔÆÌåÓý

My heat gun came with several concentrators for focusing the heat to specific areas. ?Yours probably did too. ?


Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

?

Owner - Operator

Big Signal Ranch ¨C K9ZC

Staunton, Illinois

?

Owner ¨C Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:??bill@...

?


On May 19, 2025, at 7:23?PM, John Owens K1JO via groups.io <johnowenschina@...> wrote:

?
I put it in the reflow oven last night and the 3 difficult chips seems to work perfectly. However I must have bumped the board loading it into the oven as the Y1 (ECS-TX053-S3) is off the pads. All others seem fine. I'm not a great fan of heat guns, but I don't have a choice now, in fixing the Y1. Hopefully, I will not dislodge the caps and L7 next to it.
<inline.0.part>
Re: Back in the Saddle

 

I have found that transferring flux and solder paste from the larger stock syringes into smaller 1cc syringes makes the product easier to apply in controlled amounts and also keeps the stock syringe from drying out as quickly due to being opened less often. ?
Just connect the syringes together with a Luer-to-Luer adapter and load up as many small syringes as wanted, only takes seconds. ?
I when not using I store the material in the freezer in a sealed container to extend its shelf life.??
Solder paste is easier to apply using tapered plastic needles vs straight steel needles due to its viscosity, although you need to be careful with them around hot workpieces.? 18gauge seems best to me: ?
Steel needles are fine for flux, 22gauge, 1/2" long seems right: ?
?
73, Don N2VGU
Re: Back in the Saddle

 

I turn the airflow as low as possible on my Yihua 948 hot air tool and keep the temperature high.??
Applying background heat helps A LOT, I usually place the board on a 100¡ãC hot plate for a while before starting work.? It won't damage anything nor will it reflow anything but it will make the hot air tool MUCH more effective.??
I don't use heat shields and I cannot recall the last time I melted something or blew a part into orbit. Even in the event it happens, if you have a clean, uncluttered work surface (I know, I know...) you should be able to find it pretty easily.? Those blue silicone mats are very helpful in this regard.
Surface tension, especially with plenty of flux, is surprisingly strong and things seem to stay in place pretty well if you keep the windspeed low, the board level, and the solder liquid.? I have a chunk of aluminum plate I (carefully) put the boards on to cool when I am done.
73, Don N2VGU
?
Re: Back in the Saddle

 

Make a heat shield out of al foil, hole in the middle, with the other parts covered.?
Low flow of air, take your time, tweezer it back into position.?

Larry
KB3CUF?

On Mon, May 19, 2025 at 8:23?PM John Owens K1JO via <johnowenschina=[email protected]> wrote:
I put it in the reflow oven last night and the 3 difficult chips seems to work perfectly. However I must have bumped the board loading it into the oven as the Y1 (ECS-TX053-S3) is off the pads. All others seem fine. I'm not a great fan of heat guns, but I don't have a choice now, in fixing the Y1. Hopefully, I will not dislodge the caps and L7 next to it.
Re: Back in the Saddle

 

I put it in the reflow oven last night and the 3 difficult chips seems to work perfectly. However I must have bumped the board loading it into the oven as the Y1 (ECS-TX053-S3) is off the pads. All others seem fine. I'm not a great fan of heat guns, but I don't have a choice now, in fixing the Y1. Hopefully, I will not dislodge the caps and L7 next to it.
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