At 1/6/2021 06:57 PM, you wrote:

Andy
Thanks for the reply. I purchased the KPG-4 cable which is what I was trying to use and was using DOS. But I'm confused because the KPG-4 cable I bought
has a serial pin connector on the end going to the computer and you said it has a 25 pin connector on it. Should i have purchased one with a 25 Pin connector?

All the KPG-4s I've seen have a 9 pin serial connector. They may be aftermarket but they should work. Mine works on the TK-805D, TK-860 & TK-880.

Bob NO6B

Andy
Thanks for the reply. I purchased the KPG-4 cable which is what I was trying to use and was using DOS. But I'm confused because the KPG-4 cable I bought
has a serial pin connector on the end going to the computer and you said it has a 25 pin connector on it. Should i have purchased one with a 25 Pin connector?
Thanks
Mike

Yes, Mike, what's your email or phone number?? If you don't wanna post it, look me up on email (site below)(thanks)
--
Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
-

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Hi Danny,

which Amazon Basics adapter are you using? Looks like they have a few different ones.

here is one rated at 4.8Amps

One question is with regards to ground. In the service manual it shows pin 12 as RA/RD ground and pin 19 as TX signal ground. It labels them as (for RX, RD ground only) & (for TX, TD ground only)? respectively.?? But on the FOB, the audio grounds are all on a common ground.

Are there any issues with combining the RA & TA grounds on the TKR-850?

Thanks,

-J

Hi folks,

I'm thinking of moving my TKR-850 over to a RaspPi with a modified CM108 USB FOB to use Allstar/hamvoip for the link interface on a private network (backhaul IP over a point-to-point link).

At any rate, I got it working just fine with some Maxtrac radios on the bench. PTT is buffered with a 3904 Transistor and the COR signal has a bat43 Schottky diode to protect the cm108 chip.
Its working great with the Maxtracs. But want to move these over to the TKR-850.

Are there any gotcha's that I should be aware of? I'm planning on using the DB25 on the back for PTT, TX & RX audio. Send COR out one of the programmable pins. Seems pretty straight-forward; but wasn't sure if there might be a potential issue that I haven't thought through. I assume you set the Op Mode to 'duplex' instead of Repeat?

Thanks,
-J

We have three of these intermittent duty power amps in service with several spares. At 50 to 60 watts they seem to work for about 5 years in normal armature repeater use. I have repaired them by replacing the feed and bias resistors feeding the two power transistors. I have the following questions to anyone that is familiar with repairing these PA's.
1. Do the power feed resistors R831, R832, R833 have to be carbon resistors?? What type is best to use?
2.The bias resistors R830. R815 & 16 and R834 & 35 appear to be metal film.? ?What type is best to use?
The last couple of units I repaired I cut two 2 inch holes in the back cover and mounted a small muffin fan over the final transistors. This seems to help but if anyone has information on the best type of resistors to use it would be appreciated.
Wayne
WA5LUY

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We have a Kenwood TK-760H VHF that needs to be reprogrammed. I have the correct software KG-29D and just got what I believe is the correct Serial Port programming cable however I cannot read the radio. I’ve looked at the RB website and found the manual for the radio but no other information on programming other than the software to use. Is there anyone in the group that could shed some light on what the problem could be.

Thanks

Mike

W1ZFB

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From the SEA-PAC Executive Committee Chairman

?

The SEA-PAC Executive Committee has been closely monitoring the continuing COVID-19 pandemic situation has determined that the safest course of action for all is to cancel the 2021 in-person event.

?

This decision was based on the uncertainties of more COVID outbreaks, vaccine availability to all, and the probable social distancing requirements.? But most importantly, it is based on our genuine concern for the health and safety of you, the attendees, vendors, and presenters.? We firmly believe that providing our Ham Radio community with a safe and quality convention experience is paramount.

?

To offset this cancellation, the SEA-PAC Committee is exploring alternate online and on-air activities to engage our loyal attendees during 2021.? Watch for future SEA-PAC Wave newsletters with the details as they become available.

?

Finally, we look forward to hosting you again in Seaside, Oregon, on June 3^rd, 4^th and 5^th, 2022. Thank you for your patience and understanding and we invite you to start planning for SEA-PAC 2022.

?

73,

John Bucsek, KE7WNB

2021 SEA-PAC Chairman

Thank you so very much, it works like a charm now. 73 Larry KA0TAO?

Hi Karl,
Just found a pristine radius housing with speaker if you are still looking for one.
Mike VE7SML

Jim,

These are similar to what we have "upgraded" to for our MTR2k board. Ours do not have the voltmeter integrated. We also swap the variable device for a fixed 5v one.

Scott

Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Road
Boswell, PA 15531

would you like to post the values of the caps and inductor

Scott

Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Road
Boswell, PA 15531

On 1/5/2021 12:08 PM, dshack@... wrote:

Cort..
would you like to post the values of the caps and inductor
Dan
On Tuesday, January 5, 2021, 9:59:03 a.m. EST, Cort Buffington, N0MJS via groups.io <n0mjs@...> wrote:
I use the same “mini 360” regulator that RB uses on the Pi-hat STM32-DVM on my STM32-DVM-MTR2K and STM32-DVM-MASTR3 modems. Scott has had really good luck in sourcing his, but I found that often times I get regulators with sub-par inductors. This also led me to realize that the input and output capacitors don’t match the regulator’s specifications. The chip in the Mini 360 does produce some noise, but it’s greatly diminished when I change the input and output caps as well as inductors for the right values and known good components. Other than a couple of failures based on my own soldering skills, I’ve had no failures with the mini 360 once the inductor is changed, and the noise produced is also reduced with the correct capacitors. Before that, I had…. Too many failures.

On Jan 5, 2021, at 8:37 AM, Jim Aspinwall <Jim.No1pc@... <mailto:Jim.No1pc@...>> wrote:

I've got, had, 2-3 of those. After running a Pi and RA- interface for a month or two, one of them popped and smoked... tossed them.

The PowerWerx USB Buddy gadgets haven't failed yet.? Still experimenting with the ~$4 adjustable buck-converter units as part of building up some 3S Lithium battery backup packs.

Cort Buffington
785-865-7206

Just as an FYI to all:

Scott has had really good luck in sourcing his...

Yes and no. We also had some "bad" ones sneak into the pool.

Since we got burned (literally) a few times, we are now carefully testing each batch we get and reworking them as necessary. (changing parts values to those recommenced by the data sheets.) Since we have started doing the rework and test, we have had ZERO failures that we know about. (Knock on wood)

Scott

Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Road
Boswell, PA 15531

On 1/5/2021 9:58 AM, Cort Buffington, N0MJS via groups.io wrote:

I use the same “mini 360” regulator that RB uses on the Pi-hat STM32-DVM on my STM32-DVM-MTR2K and STM32-DVM-MASTR3 modems. Scott has had really good luck in sourcing his, but I found that often times I get regulators with sub-par inductors. This also led me to realize that the input and output capacitors don’t match the regulator’s specifications. The chip in the Mini 360 does produce some noise, but it’s greatly diminished when I change the input and output caps as well as inductors for the right values and known good components. Other than a couple of failures based on my own soldering skills, I’ve had no failures with the mini 360 once the inductor is changed, and the noise produced is also reduced with the correct capacitors. Before that, I had…. Too many failures.

On Jan 5, 2021, at 8:37 AM, Jim Aspinwall <Jim.No1pc@... <mailto:Jim.No1pc@...>> wrote:

I've got, had, 2-3 of those. After running a Pi and RA- interface for a month or two, one of them popped and smoked... tossed them.

The PowerWerx USB Buddy gadgets haven't failed yet.? Still experimenting with the ~$4 adjustable buck-converter units as part of building up some 3S Lithium battery backup packs.

Cort Buffington
785-865-7206

These are the ones I use.? They are nice to reassure you that the Pi and modem are getting the correct voltage.? You can check the supply voltage at the same time by pushing a button on the unit.? I have put about 25 of these in service over the last five years and have had no failures.? I connect the power out to a couple of the pins on the modem board GPIO and power the modem and Pi.? Do not connect a 5V source directly to the Pi when using this configuration.

<https://www.ebay.com/itm/DC-DC-LM2596-Power-Supply-Buck-Converter-Step-down-Module-LED-Display-Voltmeter/402421639705?hash=item5db232ea19:g:miQAAOSwHfpfWG6Y>


73 - Jim? W5ZIT

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On Monday, January 4, 2021 1:20:30 PM PST jeremy_georges via groups.io wrote:

> Folks,

>

> Any luck on a specific regulator to power a Raspberry PI for an Allstar,

> Echolink, etc controller? Ideally something with minimal RF noise since

> these are all switchers/buck type regulators. I could build something...but

> at this point I would just rather buy an off the shelf product with the

> integrated micro-USB adapter already in place.

>

> There are some listed on Amazon with mixed reviews. But thought I'd ask the

> group to see if you've had any real world experience with any of these.

Aside from the suggested supplies that others have given you might want to try one of these.

I've used early models of this:? ?on a dozen remote sites.?? The current models accept 5.5-24v or 5.5-32v depending on model and also provide additional useful features.

I'm in the process of qualifiying this UPS:? ? It will power any of the RPi? models and is usable with an input of 5.5-18v (suitable for use with Solar panels)

--

Ken - N7IPB

Email: n7ipb@...

Pacific Northwest 220 repeater system: http://pnw220.net

PGP Sig: F42B EF90 3CD3 31C7 3056? 122E 993A 7B2E 5138 C42A

If you think you are too small to make a difference.?

Try sleeping with a mosquito. - Dalai Lama