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What power supply to get?


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#21 Jones

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Posted 07 August 2019 - 08:47 AM

I like the battery power supply option...

I also like the battery option. I am using a pair of 6-volt Trojan golf cart batteries in series, and float charge them at 12.8 Volts. Yes, it's not 13.8, but 12 Volts is close enough, and that last 1 watt of transmit power that I am losing really does not make any difference whatsoever.  At 12.8 Volts, I only need to add water to the batteries once every 60 days or so.  If I float them at 13.8 volts, they will boil out in 2 days or less.

 

Those golf cart batteries are extremely high current, and very deep cycle. They can keep my whole ham station going for an unknown amount of time. I do cycle them once a week by shutting off the charge supply, letting the voltage go down to about 11.8, then turning the supply back on.  Under normal monitoring and light-duty transmit, running it down to under 12 Volts takes about 12-14 hours.

 

I also have a solar array that I can patch into the power bus if needed or desired, and a 7.5KW continuous-duty gasoline powered Generac Niagara with a whole-house Eaton transfer switch if times get really tough.



#22 nyc787

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Posted 08 August 2019 - 05:55 PM

So I wired the power supply with banana plugs, connected radio with anderson plugs but now 2 of the Kenwood 880H do not power on.
I suspected the power supply is broken. I got a voltage meter and the power supply is showing it’s outputting 13.92V so that seems to be operating? Is it possible for power supply to show right voltage but still be malfunctioning and not outputting enough Amps to power on the radio? Or did I buy very old Kenwoods that are busted?
EF81-F969-7-B02-47-CE-8789-74-E846-CEA30what qualifications do i need to be a forensic anthropologist

#23 n4gix

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Posted 08 August 2019 - 07:56 PM

Check the Anderson Power Poles to make certain that the inserts have clipped over the internal springs. If they aren't fully seated, trying to connect them will push the inserts back and break the connection(s).

I had to fix two of them today that I "thought" were fully seated. :unsure:


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#24 nyc787

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Posted 08 August 2019 - 08:33 PM

I will check the connections, some have given me a problem where they didn’t click. But also some guys were telling me these radios might be programed for ignition sense and I have to supply 12 volt to that kct19 accessory pin connector.

#25 nyc787

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Posted 08 August 2019 - 10:06 PM

I powered up another 12 volt device and it worked from this power supply so I’m now thinking the problem is with the radios.
I removed anderson plugs and bare wired the radio and it still won’t turn on. I will tinker with it more and if I can’t figure out how to go around the potential ignition sense connection, then I’ll return the radios.

#26 Jones

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Posted 08 August 2019 - 10:13 PM

KCT-19, Accessory Plug Pinout:

Pin 1- External mic hook input or system busy output **
Pin 2- Mic Ground or Speaker audio mute **
Pin 3- Ignition Sense input
Pin 4- Receiver Detector output
Pin 5- External Mic input or Transmitter Sense out **
Pin 6- Ground
Pin 7- Switched battery + (13.6 volts, 0.75A max)
Pin 8- External PTT
Pin 9- Data Modulation Input
Pin 10- Horn alert
Pin 11- Squelch Detect output
Pin 12- Speaker Audio output
Pin 13- Link Complete pulse output or Speaker mute input **
Pin 14- Serial Control data input or Mic Mute input **
Pin 15- Serial Control data output or
Data Control channel signal input or
Link complete pulse output or
Transmitter Sense output or
Foot Switch input **
**(all dependent on jumpers or programming)

 

Try hooking +12 Volts to pin 3.



#27 nyc787

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Posted 08 August 2019 - 11:08 PM

Do you know what color wire is pin 3? Does it mean I have to apply ground wire to pin 6 as well, black wired pin?

#28 Jones

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Posted 09 August 2019 - 08:27 AM

Do you know what color wire is pin 3? Does it mean I have to apply ground wire to pin 6 as well, black wired pin?

This un-related page has some photos which may help you.  Pin 6 is ground return for external options. you do not need to hook it to anything.

 

http://www.quest4.org/radio/kct-19.htm



#29 axorlov

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Posted 09 August 2019 - 11:03 AM

This may be of help:

 

kct18.jpg

 

 

Important: picture below is for pin locations. Do not connect power to pin 7, this pin (and pic) is how to provide switched power from the radio to external hardware.

 

kct19.jpg


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#30 nyc787

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Posted 09 August 2019 - 02:18 PM

The issue was the ignition sense. I was able to turn on both radios by applying power to pin 3 but now I’m struggling to figure out how to disable this function. Manual tells me to open up the radio to fiddle with resistors but is there a more easier way like through the KPG49D software or on front panel? It appears the radio is preprogramed and I hope it’s not locked to make changes.
0-E28015-C-A858-441-B-BCD8-4-B8-AC3-E7-A

#31 nyc787

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Posted 09 August 2019 - 06:28 PM

I tried disabling ignition sense from KPG49D but could not find the option in Optional Features.
I tried writing new frequencies to radio and they seem to write to the radio but this error message was popping up. Is this compatibility issue a problem or not relevant?


CA71-E2-FF-6-F50-4-F4-F-80-B9-AF5-A1-BDF

E0786-D5-C-FAF4-4887-8-E64-FECA505927-AA

#32 axorlov

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Posted 10 August 2019 - 11:36 AM

Can't help here. My radio is v2, I never had this error message.



#33 nyc787

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Posted 11 August 2019 - 11:42 AM

Radio still responds to KPG49 program as I was able to change key assignments. I assume ignition sense control is only available for version 2 of this model. So I just have to live with having a 2nd + wire going to accessory pin. I spliced a 2nd + wire from the main power coming from supply and added a paperclip to plug into the pin. Is ground wire into the accessory pin also important or it’s safe without a ground wire?
I’ll start a new topic to get help with properly programming this radio as I familiarize myself with KGP49 and the manual.



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