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G4APL > KENWOO 16.04.07 19:14l 49 Lines 2019 Bytes #999 (0) @ WW
BID : 8987G4APL
Read: ON4AEV GUEST
Subj: Re: Kenwood THD7e Very Deaf > 20db
Path: ON0AR<GB7CIP<GB7CIP<GB7CIP
Sent: 070416/1809Z @:GB7CIP.#32.GBR.EU $:8987G4APL
T:From: Paul Lewis <g4apl@gb7cip.ampr.org>
T:Newsgroups: ampr.radio.kenwood
T:Message-Id: <QlTUkAADo7IGFwSY@g4apl.ampr.org>
In article <E90079VK2TV@hamradio>, vk2tv%vk2tv.#mnc.nsw.aus.oc@gb7cip.am
pr.org writes
>From: VK2TV@VK2TV.#MNC.NSW.AUS.OC
>To : KENWOO@WW
>
>
>G4APL wrote:-
> Hello All,
>
>> Diagnostics What it could be.
>> 1) aerial socket dry joint between socket and THD7e Circuit board
>> 2) Diode Solid state change over relay failure, diode open circuit
>> (would give +20db drop in receive signal)
>> 3) Problem with aerial path from Aerial socket not making connection to
>> the THD7e helical aerial or SMC/BNC adaptor. Have tried second SMC/BNC
>> adaptor.
>> 4) Could be something else?
>> 5) Power level indicator EL L HI seem to indicate the same level. Would
>> also indicate that the change over path is open circuit.
>> 6) Could be another fault
>>
>> Has anyone else experienced a similar fault with their Kenwood THD7e
>
>Not with a Kenwood of any model but hundreds of times with commercial
>two-way radios.
>
>20dB reduction in sensitivity could be the antenna switching diodes -
>struck a few of those that got fried - but on the other 197 occasions it
>was the RF stage device that had died. It was really common with STC 191
>mobiles that used an unprotected dual gate FET, but not uncommon with
>radios of other manufacture.
>
>Cheers ... Ray
Hi Ray
thanks for your feedback. That's what I was dreading.. A software FULL
reset of the hand held did not bring it back to life.
Paul g4apl
--
amprnet g4apl@gb7cip.ampr.org Internet paul@skywaves.demon.co.uk
ax25 g4apl@gb7cip.#32.gbr.eu amprnet webserver http://gb7cip.ampr.org
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