[Elecraft] K3 Hi-power Transmit limiting

[n6ax at speakeasy.net]

Mark, an RS-35 ought to be plenty capable of powering your K3.

I am using a Drake PS-7 (originally for the TR-7) which doesn't sag at all yet I
am having the same problem with my K3 TX power that you reported...sent a note to
K3 Support and will let you  know any information.

John




On Tue Feb 14  7:27 ,  sent:

>---- Keith keith at elecraft.com> wrote: 
>> One would initially think of a power supply problem, I found out an 
>> Astron RS-20 is insufficient.
>
>That is good information to know!  Thanks.  Exactly the sort of info I was
seeking when I reiterated someone else's questions about power supplies. 
>
>Is the RS-35 up to it?   I saw a 'used' RS-70 for sale recently....   but I
wasn't ready to buy until I gathered more information from here and elsewhere
>
>de K5MSG
>yes, it's vanity...
>Mark S Gilstrap
>
>---- Keith keith at elecraft.com> wrote: 
>> One would initially think of a power supply problem, I found out an 
>> Astron RS-20 is insufficient.
>> But "new firmware" was mentioned, the latest is 4.39 (non-beta), Are 
>> either of you using a new Beta version?
>> Keith
>> 
>> On 2/12/2012 3:14 PM, n6ax at speakeasy.net wrote:
>> > Latest firmware, just did TX cal a few weeks ago, same things happens whether on
>> > antenna or dummy load, PS not dropping, mine drops to essentially zero output
>> > above about 88 watts.
>> >
>> >
>> >
>> >
>> >
>> > anyone....Buehler....anyone?
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > On Sun Feb 12 15:05 ,  sent:
>> >
>> >> Mine just started that behavior yesterday as well.....the oddest thing...any
>> >> ideas, guys?
>> >>
>> >>
>> >> John
>> >>
>> >>
>> >>
>> >>
>> >> On Sun Feb 12 13:38 , r_zerr  sent:
>> >>
>> >>> I began having problems this morning when I went to check into the Elecraft
>> >>> Net. I had my output set at 100W, and I did not have any output. By turning
>> >>> it down to around 70 watts, I could transmit.
>> >>>
>> >>> I went through the transmit gain calibration on 20M and the Wattmeter
>> >>> calibration, with apparent changes in the Wattmeter reading (initially at
>> >>> 31, now at 79...50W into Dummy load, Bird Wattmeter, 100W slug). The
>> >>> Transmitter gain changed only slightly, 16 to 17, but is more of a choice
>> >>> between high-side, or low side of the meter reading.
>> >>>
>> >>> Checked and Bat Min setting is at 11.0V and the KXV3 setting is normal
>> >>>
>> >>> Other info in present condition: 20M>90W kicks off. 20.4A draw at 90W PA
>> >>> temp=33C Voltage @load=12.4V
>> >>>
>> >>> I checked the behavior on 17M with similar problems, kicks off above 96W
>> >>> setting, with 12.8V, 14.3A draw
>> >>> 15M kick of above 96W, with 12.6V @ 17.8A
>> >>> 12M kicks off above 97W, with 12.8V @ 14.1a
>> >>> 10M kicks off above 97W  with 12.9V @ 13.6A
>> >>> 30m kicks off above 98W with  12.6V @ 16.5A
>> >>> similar results on 40m and 80m
>> >>>
>> >>> Before I go pulling the top off and checking connections, does anyone have
>> >>> any suggestions?
>> >>>
>> >>>
>> >>> -Ron, WT5RZ
>> >>>
>> >>>
>> >>> --
>> >>> View this message in context:
>> >>
http://elecraft.365791.n2.nabble.com/K3-Hi-power-Transmit-limiting-tp7278630p7278630.html
>> >>> Sent from the Elecraft mailing list archive at Nabble.com.
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