[Elecraft] KAT500 ANT1 problem

[Dave]

I have had very good luck using American Radio Supply:

https://www.americanradiosupply.com/

and DXE connectors...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 7/11/21 2:06 PM, Don Wilhelm wrote:
> And discard those "Amazon Special" PL-259s. Use only quality 
> connectors.  It is not worth it to use off-spec connectors - you are 
> witness to the pain and heartache they can cause.
> 
> 73,
> Don W3FPR
> 
> On 7/11/2021 4:52 PM, Dave wrote:
>> If it were me, I'd replace the SO-239 on the tuner...  That way, you 
>> know the issue won't come back to haunt you later.
>>
>> 73, and thanks,
>> Dave (NK7Z)
>> https://www.nk7z.net
>> ARRL Volunteer Examiner
>> ARRL Technical Specialist, RFI
>> ARRL Asst. Director, NW Division, Technical Resources
>>
>> On 7/11/21 1:48 PM, kd4iz at frawg.org wrote:
>>> Many thanks to Ken (K6MR), Joe (4X1RV), and Kirk (K6KAR) for your quick
>>> answers and for providing the schematic information.
>>> I pulled the unit and did some poke and prod testing with a DVM here 
>>> on the
>>> anti-static mat. My fear was that K18 had a bad contact in the ANT1
>>> position. -Not!-
>>> What had apparently happened was that I had a batch of the offshore made
>>> "Amazon Special" PL-259s that appear to have a slightly oversize 
>>> center pin.
>>> The patch cable used until recently had one of them on one end. It had
>>> spread the leaves on the ANT1 SO259 just enough that a good 
>>> connector, when
>>> perfectly centered and seated, did not make contact! Gentle 
>>> recentering of
>>> the leaves with a miniature flat blade screw drive yielded relief and a
>>> self-administered head smack.
>>> Jack Spitznagel - KD4IZ
>>> Science River LLC
>>> Biomedical Consulting Services
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: kirk.harding at k6kar.com <kirk.harding at k6kar.com>
>>> Sent: Sunday, July 11, 2021 14:07
>>> To: kd4iz at frawg.org
>>> Subject: RE: [Elecraft] KAT500 ANT1 problem
>>>
>>> Jack,
>>>
>>> The KAT500 schematic is on line (partial)
>>> https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page1.png
>>> https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page2.png
>>> https://www.qsl.net/wb4kdi/Elecraft/KAT500/KAT500_RevA_page5.png
>>>   Although all schematics aren't available, this may be enough to get 
>>> you
>>> going.
>>>
>>> 73,
>>>
>>> Kirk, K6KAR
>>>
>>> -----Original Message-----
>>> From: elecraft-bounces at mailman.qth.net 
>>> <elecraft-bounces at mailman.qth.net> On
>>> Behalf Of kd4iz at frawg.org
>>> Sent: Sunday, July 11, 2021 12:38 PM
>>> To: Elecraft at mailman.qth.net
>>> Cc: 'Elecraft Support' <support at elecraft.com>
>>> Subject: [Elecraft] KAT500 ANT1 problem
>>>
>>> All,
>>>
>>>
>>> This is likely something very straight forward, but I do not have a
>>> schematic to follow and troubleshoot.
>>>
>>> Symptom: ANT 1 circuit seems to be dead. No match and fault on switch 
>>> from
>>> ANT2 to ANT1. No receive signal.
>>>
>>> Tests:
>>>
>>> Took KAT500 out of line to by-pass tuner, antenna on ANT1 is OK and will
>>> match normally with rig's internal ATU.
>>>
>>> With KAT500 back in line, selected each tuning position (AUTO, MAN, 
>>> BYP) no
>>> difference
>>>
>>> With KAT500 still in line, ANT2 and ANT3 work nominally.
>>>
>>> Checks:
>>>
>>> Reset to factory defaults, restored last working Configuration, no 
>>> change in
>>> above behavior.
>>>
>>>
>>> If I was a betting guy, I'd guess a relay or switching diode was open,
>>> however - no schematic, don't really know.
>>>
>>> Did I miss something
>>>
>>>
>>>
>>> Does this little beastie need to go back to the mothership?
>>>
>>>
>>> Thanks,
>>>
>>> Jack Spitznagel - KD4IZ
>>>
>>> Science River LLC
>>>
>>> Biomedical Consulting Services
>>>
>>>
>>>
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>>> delivered to kirk.harding at k6kar.com
>>>
>>>
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>>>
>> ______________________________________________________________
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>> Message delivered to don at w3fpr.com 
> 
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