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Re: Alpha Anxiety

 

So glad!!? Big props for them


On June 10, 2024 1:28:37 PM PDT, "David via groups.io" <dkvarn@...> wrote:
I sent a message to Steve (Alpha pres) with full set of pix and received a reply within a few hours. Another tuning box will be sent right away along with a return label. He said that the boxes are tested at three points within the tuning range, that this process must have missed the problem and that they are revising the test procedure as a consequence. Speaks well for them IMO.?

Re: What happened to the bands? 20m is dead

 

You might want to look at

Paul
Re: Alpha Anxiety

 

David, woohoo!

73, Eric NF6S

ex WD6DBM

?

On Mon, Jun 10, 2024 at 1:28 PM, David via groups.io
<dkvarn@...> wrote:
I sent a message to Steve (Alpha pres) with full set of pix and received a reply within a few hours. Another tuning box will be sent right away along with a return label. He said that the boxes are tested at three points within the tuning range, that this process must have missed the problem and that they are revising the test procedure as a consequence. Speaks well for them IMO.?

Re: Alpha Anxiety

 

I sent a message to Steve (Alpha pres) with full set of pix and received a reply within a few hours. Another tuning box will be sent right away along with a return label. He said that the boxes are tested at three points within the tuning range, that this process must have missed the problem and that they are revising the test procedure as a consequence. Speaks well for them IMO.?
Re: What happened to the bands? 20m is dead

 

CME hitting today from M9.7 x ray flare on Saturday


On June 10, 2024 12:17:45 PM PDT, Doug Hendricks <ki6ds1@...> wrote:
Not a signal to be heard here.? What are you guys experiencing?

Re: What happened to the bands? 20m is dead

 







On Mon, Jun 10, 2024 at 12:17, Doug Hendricks <ki6ds1@...> wrote:
Not a signal to be heard here.? What are you guys experiencing?

--
Connie KN2EFI
What happened to the bands? 20m is dead

 

Not a signal to be heard here.? What are you guys experiencing?
Re: TruSDX FTW

 

I prefer units, such as the (tr)uSDX, which does not have a built-in battery. ?That allows me to plug in batteries of varying voltages to safely check the SWR of portable antennas (or operate QRPp at even lower power levels), by using 6 to 8 Volt battery packs (or recycling a 9V one that a smoke detector had discharged to 7V). ?Then I switch to a higher voltage battery pack only if the antenna shows a good SWR.
73, Ron, n6ywu
Re: TruSDX FTW

 

In theory, an FET subjected to an overvoltage condition goes into Avalanche Mode Breakdown, which is a region where the?FET functions like a zener, with a wattage rating equal to the FET wattage rating. That zener might be one-watt rated, maximum. I'm guessing it would blow out faster than the FET.


On Sun, Jun 9, 2024 at 3:55?PM Hiroki Kato via <hiroki=[email protected]> wrote:
How does the diode protect against high SWR? What is the theory?

Hiroki AH6CY by



On Jun 9, 2024, at 14:57, Doug Hendricks <ki6ds1@...> wrote:

?It's the diode connected to the black connector at the top middle of the picture.? ?Do you see it now

Re: TruSDX FTW

 

I discussed with Ed Fong (WB6IQN)? concerns about installing an internal battery on these radios.

You don't want the biggest Li+ pouch cell that will fit.? ? They expand 10-12% radially as they age.? ? You don't want to puncture a puffy battery.

73 de AI6KG



On Sun, Jun 9, 2024 at 6:39?PM Hiroki Kato via <hiroki=[email protected]> wrote:
Doug,

I assume you are talking about the USDX radio¡¯s battery. The (tr)uSDX has no internal battery.
A charger came with my USDX. Since it is charging 11 V battery, ?I assume it is feeding 11-12V. I never measured it so it is just a guess. I will test it when I get home (I¡¯m in Seattle now). The plug is smaller than the external 12-13.8V ?ps plug which is a common size.

Hiroki AH6CY
?




On Jun 9, 2024, at 16:12, Doug Hendricks <ki6ds1@...> wrote:

?On another topic how do you charge the internal battery?? What size plug, what is polarity?

Re: TruSDX FTW

 

¿ªÔÆÌåÓý

Doug,

I assume you are talking about the USDX radio¡¯s battery. The (tr)uSDX has no internal battery.
A charger came with my USDX. Since it is charging 11 V battery, ?I assume it is feeding 11-12V. I never measured it so it is just a guess. I will test it when I get home (I¡¯m in Seattle now). The plug is smaller than the external 12-13.8V ?ps plug which is a common size.

Hiroki AH6CY
?




On Jun 9, 2024, at 16:12, Doug Hendricks <ki6ds1@...> wrote:

?On another topic how do you charge the internal battery?? What size plug, what is polarity?

Re: TruSDX FTW

 

On another topic how do you charge the internal battery?? What size plug, what is polarity?
Re: TruSDX FTW

 

Keeps the SD junction? voltage below 60v limit.? Diode conducts at 47v
Re: TruSDX FTW

 

¿ªÔÆÌåÓý

How does the diode protect against high SWR? What is the theory?

Hiroki AH6CY by



On Jun 9, 2024, at 14:57, Doug Hendricks <ki6ds1@...> wrote:

?It's the diode connected to the black connector at the top middle of the picture.? ?Do you see it now

Re: TruSDX FTW

 

It's the diode connected to the black connector at the top middle of the picture.? ?Do you see it now
Re: TruSDX FTW

 

good advice. Any chance you could resend one of those pictures with the component circled? ? that'll make it a little easier when I get home and dig through my 10,000 emails. If not, it's easy enough to figure out.

thanks again, Connie W6EFI



On Sun, Jun 9, 2024 at 14:18, Doug Hendricks <ki6ds1@...> wrote:
Connie and Hiroki,? it's a simple fix.? Just be sure to pay attention to diode band orientation.?

--
Connie KN2EFI
Re: TruSDX FTW

 

Connie and Hiroki,? it's a simple fix.? Just be sure to pay attention to diode band orientation.?
Re: TruSDX FTW

 

Re: TruSDX FTW

 

Lower left corner.?
Re: TruSDX FTW

 

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