Date   
Re: Second batch of uBITX shipping? #ubitx

Stig oz8pz-oz8wsp-oz8wsr
 

Yes, i order 15.12.2017 and i Got reply from Paypal that it was send to day by Indian post. Now i just sit waithing.
73, Oz8pz stig
Sendt fra min iPad

Den 26. jan. 2018 kl. 05.43 skrev mikael.madsen@...:

Someone posted that order date 14th december had been shipped but that was some days ago.

Anyone with a later order date later than 14th been informed of shiping yet?

Re: Second batch of uBITX shipping? #ubitx

dj0hf
 

Ordered on the 16th December - Nothing yet.

73
Ian
DJ0HF/G3ULO

Re: uBitx TX performance with frequency

Lawrence Galea
 

Agree.
Mine hasn't arrived yet so cannot check anything yet.Regards
Lawrence


On Thu, Jan 25, 2018 at 3:15 PM, K9HZ <bill@...> wrote:

This may be a futile attempt if the intermediate gain stages (pre-driver and drivers) fall off with frequency too.  I have not done this myself yet… still on my list… to actually publish a table showing the output at each stage with frequency to determine what needs attention BEFORE the PA.  Then a change to the PA makes full sense.

 

 

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

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

 

email:  bill@...

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Alex Buurlage
Sent: Thursday, January 25, 2018 3:37 AM
To: BITX20@groups.io
Subject: Re: [BITX20] uBitx TX performance with frequency

 

Bob,

Yes, I've seen similar behaviour on my homebrew uBitx. Increasing the drive will overload the PA at 80 meters but will hardly increase the power output at the high bands. I even made a change in the driver circuit that decreases the gain below 10MHZ so I could crank up the overall gain of the TX chain more trying to get more output at 14MHz and up. No success. After extensive experiments I've decided to replace the IRF510's with RD16HHF1 mosfets (not pin-compatible!).

I am now optimizing the output transformer and impedance levels but so far the TX power ranges from 10 watts at 80m to 8 watts at 17m. The 15m and up LPF is not finished yet, but reviewing the specs of the RF16HHF1 I don't expect much further power drop at 28 MHz.

Secondly I like the idea of the housing of these mosfets being the source, so a direct grounding to the case is easy. No insulation material needed and a better RF ground.

A slight disadvantage is that the bias current of the RD16HHF1 is a little higher, but that's ok for me.
If you should make such a change with the commercial PCB version, beware of the pin incompatibility.

73, Alex
PA1FOX


Lost in Customs?

DJ4MU
 

My µBitX was ordered on 12/10/17 , shipped on 12/15/17 Tracking claims it arrived in Germany 12/20/17 and went to customs on 01/02/18 no sign or trackability since. DeutschePost (not DHL) claims there's nothing they can do until they get the new ID from customs, customs claim there's nothing they can track at all. Any suggestions what i can do? Anyone experienced similar with german customs? Do you think there's still hope it will arrive?

Re: Lost in Customs?

Gordon Gibby
 

That sounds like a problem you’ll have to take up with your own government and private authorities. Perhaps a visit to wherever the trail ended? We yanks aren’t likely to know much about it....sorry

Sent from my iPhone

On Jan 26, 2018, at 05:12, DJ4MU <pbepler@...> wrote:

My µBitX was ordered on 12/10/17 , shipped on 12/15/17 Tracking claims it arrived in Germany 12/20/17 and went to customs on 01/02/18 no sign or trackability since. DeutschePost (not DHL) claims there's nothing they can do until they get the new ID from customs, customs claim there's nothing they can track at all. Any suggestions what i can do? Anyone experienced similar with german customs? Do you think there's still hope it will arrive?

Re: Lost in Customs?

Ken
 

You'll just have to be patient.

With my ubitx, last tracking placed it in a bag in Mumbai and couldn't track it after that. Three weeks later it was at the post offiice for pickup.

73

Ken VA3ABN

On Fri, Jan 26, 2018 at 5:19 AM, Gordon Gibby <ggibby@...> wrote:
That sounds like a problem you’ll have to take up with your own government and private authorities. Perhaps a visit to wherever the trail ended? We yanks aren’t likely to know much about it....sorry

Sent from my iPhone

On Jan 26, 2018, at 05:12, DJ4MU <pbepler@...> wrote:

My µBitX was ordered on 12/10/17 , shipped on 12/15/17 Tracking claims it arrived in Germany 12/20/17 and went to customs on 01/02/18 no sign or trackability since. DeutschePost (not DHL) claims there's nothing they can do until they get the new ID from customs, customs claim there's nothing they can track at all. Any suggestions what i can do? Anyone experienced similar with german customs? Do you think there's still hope it will arrive?


Re: IRF510 amplifier failures

KD8CGH
 

I was looking at the data sheet from Mitsubishi for their RD15HVF1 and in the electrical characteristic table on page two it says:
   Parameter                                      Conditions                    Limits
Load VSWR tolerance              Load VSWR=20, ...             no destroy
                                                VDD=15.2V, Po=15W

If I am reading this correctly it looks like at over voltage and high power out it is expected to survive a VSWR of 20.

https://www.rfparts.com/rftransistors/transistor-rd/rd15hvf1.html

with friend google I also found  https://groups.io/g/QRPLabs/message/13357

Wouldn't it be better to change to a RD15HVF1 for high VSWR rather than add circuits, even if the RD15HVF1 did not yield substantially better uBitx power performance at higher frequencies?

    Bob   KD8CGH

Re: IRF510 amplifier failures

KD8CGH
 

I decided to add a polyswitch to my uBitx. Since it can draw almost 2 amps I selected a 3 amp, 16 V model. When I got them I tested one and found that I could not trip it with my 5 amp lab bench supply. Reading the specifications (after purchase - duh) I see that it is speced to trip at 6 amps continuous current with a max time to trip of 5 seconds at 15 amps. I'm not sure that this would protect the finals. In contrast, a 3 amp fast blow glass cartridge fuse is speced to blow  in 5 seconds at 6 amps.
I got a glass fuse holder and a handful of 2, 2.5 and 3 amp fuses. I'll see if I can get by with 2 amps in normal operation.

Re: Lost in Customs?

Gernot W. Volkland
 

Did you try 2 contact DHL via 0228 4333118 also ? 

Re: IRF510 amplifier failures

n5ib_2
 

One other possibility to consider to protect against overcurrent situations is to use a current limiting power supply, or add a current limiter to an existing power supply or battery.

The current limiter circuit whose link is at this site:
<http://n5ib.net/Index.xht>
will go up to 2.2 amps, and includes a low-dropout voltage regulator that also provides reverse polarity protection.

There is a version, in a different package, of that same regulator chip that has an added "tracking" feature - being able to parallel multiple chips to increase the available current. Details are on the datasheet in the document.

Jim, N5IB

Re: Lost in Customs?

DJ4MU
 

On Fri, Jan 26, 2018 at 04:57 am, Gernot W. Volkland wrote:

Did you try 2 contact DHL via 0228 4333118 also ?

Yes, that's where i got the information about arrival in Germany and when it went into customs (01/02/18) from.
Sadly they deny any responsibility and ability to help after that.

batch shipping

crofter
 

have hfsignals a shipping date on orders placed late january

thanks
crofter

Apache Case on Sale

Jack Purdum
 

All:

Harbor Freight has their small Apache chase on sale for the month of February. Inside dimensions are:

   Length: 8-3/8"
    Height: 3-3/4"
     Width: 5-11/16"

The case is similar to a small Pelican case, water resistant, and very rugged. If you get their flyer, the coupon is on p. 16. The price is reduced from $15 to $10.

Jack, W8TEE

Re: Apache Case on Sale

KE0GYC
 

I love the idea of a "portable field radio" with all the controls on the top in a watertight case like this.  I'm thinking of modeling it after a bitX40 build I saw here, and this case looks like the perfect size!

Is there any reason I couldn't do that with the uBitx?  It looks like the LCD plugs directly into the board, but would it give me noise issues if I used a short length of ribbon cable to move the LCD to face upwards?

Re: Solder Paste Extruder

Ken KM4NFQ
 


On Thu, Jan 25, 2018 at 10:39 PM, Arv Evans <arvid.evans@...> wrote:
Ken, KM4NFQ

That solder paste extruder is a great idea.  I have used these tubes of solder paste for
several years but always fought with expressing enough, but not too much, of the paste.

Tomorrow I will be in my workshop building one of your devices.  I really like the concept.

It seems possible that the solder paste extruder could also be adapted to a CNC Mill
or a 3D printer and used with appropriate G-Code to place small solder paste dots
for oven-baking of components to the PCB. 

Arv  K7HKL
_._


Hello Arv, K7HKL,

If you build your own Solder Paste Extruder, please send a snapshot of it to me.
I'm sure yours will look orders of magnitude better than mine.

Here are the approximate dimensions of the prototype that I made (not to scale):


​I used a piece of scrap 1x pine, 0.75" thick.
The screw is 1/4-20 about 3.75" long, from the scrap box.
The hole for the nut was drilled, then filed out.
The slots that hole the finger tabs on the syringe are the width of the jig saw blade.
I put masking tape around that part to keep the syringe from twisting / falling out.



My dental hygienist saves broken dental tools for me. They come in handy.

Regards,
Ken, KM4NFQ "Not Fully Qualified"



Re: Apache Case on Sale

daniel.fay@...
 

I'm planning to use the "big" version of the case (the 3800) to also hold things like accessories, battery pack, etc. for my uBitX.

I'm considering putting the LCD on a ribbon cable as well. From my personal experience with other low-speed, single-ended signals, you're probably fine for at least 15cm/6".

-Dan Fay

Re: Apache Case on Sale

Jack Purdum
 

I think there are a number of people who have moved the display away from the main board to give them some flexibility in terms of display placement. Evidently, some shielding is needed, but I think I recall someone simply wrapping the cable in foil mitigated the problem. I'd like to hear from anyone who has moved the display and what their experience is.

Jack, W8TEE



From: KE0GYC <dragonfanatic90@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 9:24 AM
Subject: Re: [BITX20] Apache Case on Sale

I love the idea of a "portable field radio" with all the controls on the top in a watertight case like this.  I'm thinking of modeling it after a bitX40 build I saw here, and this case looks like the perfect size!

Is there any reason I couldn't do that with the uBitx?  It looks like the LCD plugs directly into the board, but would it give me noise issues if I used a short length of ribbon cable to move the LCD to face upwards?



Virus-free. www.avast.com

Re: Solder Paste Extruder

Doug W
 

On Thu, Jan 25, 2018 at 07:40 pm, Arv Evans wrote:
It seems possible that the solder paste extruder could also be adapted to a CNC Mill
or a 3D printer and used with appropriate G-Code to place small solder paste dots
for oven-baking of components to the PCB

Here is one guy's attempt at exactly that  https://www.youtube.com/watch?v=tgXtRDVvhdU  seems the next evolution would be to fit a vacuum pump and home brew a pick and place rig.

Re: SMD Group Build

Michael Monteith
 

For myself I was thinking about getting one of these.   If nothing else great for close inspection of solder joints etc.

New Mega Pixels 1000X 8 LED USB Digital Microscope

73, Michael
KM4OLT

Re: Solder Paste Extruder

Jim Sheldon
 

Gm Jack,
You are not using BCC, your are using just CC and I'm still getting everything on the list including everyone's email addresses.  I'm still getting all the replies from the other people too.

Please, Please just remove me completely from this.  I'm getting too many emails to have to keep deleting them.  Sometimes I spend more time having to delete this stuff that I get done working on what I need to.

Sorry, but this has GOT to stop!

Jim - W0EB

------ Original Message ------
From: "Doug W" <dougwilner@...>
Sent: 1/26/2018 9:04:04 AM
Subject: Re: [BITX20] Solder Paste Extruder

On Thu, Jan 25, 2018 at 07:40 pm, Arv Evans wrote:
It seems possible that the solder paste extruder could also be adapted to a CNC Mill
or a 3D printer and used with appropriate G-Code to place small solder paste dots
for oven-baking of components to the PCB

Here is one guy's attempt at exactly that  https://www.youtube.com/watch?v=tgXtRDVvhdU  seems the next evolution would be to fit a vacuum pump and home brew a pick and place rig.