k2-100

[Ron McMurray]

more info on problem. bypass antenna around kpa100 problem still there.
unhook kio2 from kpa and problem goes away

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[Don Wilhelm-4]

Ron,

I would look for a problem in the KPA100 T/R switch area.  Especially be
suspect of Q6 and Q7, D11, D12, D13 and D14.

While this sounds like a condition when a relay contact is damaged,
resist that thought because the K2 and KPA100 transmit/receive switching
does not operate any relays, it is entirely electronic.

When you say you "bypass the antenna around the KPA100" do you mean that
you attach the antenna to the base K2 *in place of* the KPA100? please
explain better just how you are accomplishing that.  Is this a KPA100
mounted externally to the base K2?

73,
Don W3FPR


ron wrote:

> more info on problem. bypass antenna around kpa100 problem still
> there. unhook kio2 from kpa and problem goes away
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[Ron McMurray]

more info. low rceive after keying also occurs with kpa100 shut off in menu.
should'nt the signal bypass the t/r switch in this mode. k1 and k2 are ok
with no power. problem still there with power unhooked to kpa. have kat100
and kpa100 in seperate box. not using kat100 . signal hooks to aux rf in on
kat.
ron

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[Don Wilhelm-4]

Ron,

You are correct that the T/R switch is bypassed when the KPA100 is set
off in the menu.

If I recall your prior post, it behaved correctly with the cable removed
from your KIO2 adapter.
Leave the KIO2 plugged in and the base K2 with its top cover off.  Then
when it misbehaves, check the voltage on the 8R voltage rail - easily
accessible at Control Board Q2 collector.  The normal voltage during
receive is 7.5 to 8 volts, and if it is substantially lower, the K2 will
not receive well.

That is the one signal that is carried to the KPA100 from the base K2
that could reduce receive signal levels.

73,
Don W3FPR

ron wrote:

> more info. low rceive after keying also occurs with kpa100 shut off in
> menu. should'nt the signal bypass the t/r switch in this mode. k1 and
> k2 are ok with no power. problem still there with power unhooked to
> kpa. have kat100 and kpa100 in seperate box. not using kat100 . signal
> hooks to aux rf in on kat.
> ron
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[Ron McMurray]

think u4 on control brd is the problem. pwr sply mst have zapped it when it
went bad. thanks again to don.
ron

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