home *** CD-ROM | disk | FTP | other *** search
- Date: Thu, 15 Jun 89 14:11:38 PDT
- From: beekman%a1_utrop2.DEC@decwrl.dec.com
- Subject: Trio - Kenwood TS430 extended coverage
-
- Author: Wim Beekman
- Date: 25-Oct-1988
- Posted-date: 25-Oct-1988
-
-
- ================================================================================
- TRIO-KENWOOD mods and remarks
- -< Include 0-150kHz on your TS430 >-
- --------------------------------------------------------------------------------
-
- This modification is to include the receiving range from
- the TS430 from 0-150 kHz.
-
- Connect a resistor from 1K from IC1 pin 14 to ground in
- the PLL Unit.
-
- (Pin 14 from IC1 goes to the base of a transistor.)
-
- The best way to do this, is by soldering the resistor at
- the solder side of the PLL Unit PCB.
-
-
- Peter -PA3AEF-
-
-
- Newsgroups: rec.radio.amateur.misc
- From: ik3huk@sabrina.dei.unipd.it (Diego Serafin)
- #Subject: TS430 power fault - ANSWERS
- Message-ID: <BwuBHK.Kqw@dei.unipd.it>
- Sender: usenet@dei.unipd.it
- Organization: D.E.I. Universita' di Padova, Italia
- Date: Wed, 28 Oct 1992 16:36:56 GMT
- Lines: 135
-
- Hi there !
- As anticipated, I repost all the answers that came to me about TS-430 power
- fault. Thank You Very Very Much to everybody who sent suggestions and proposed
- solutions to the problem. I will open up the radio as soon as possible and
- do what suggested.
-
- MNI TNX AGN ES BEST 73 de IK3HUK Diego. ...-.-
-
-
- Follows my original posting and answers.
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- >As you read in the subject I have some sporadic but very annoying troubles
- >with my 1988 Kenwood TS430s. This is what happens to my gear (and the same
- >occours to the rig of a friend of mine):
- >
- >Approx. every 3-4 hours of CW operation (while working without any problem)
- >the power output drops down to a few watt (tipically duringa pileup and when
- >the dx sent 'ik3huk 599...'). During this power-loss the ALC level is low
- >(regularly).
- >To have back the full power I have to do the following:
- >-Turn CARRIER knob fully clockwise (full power position - ALC doesn't move)
- >-Key down for several seconds (very looooong time when in pileup)
- >
- >I sent the radio to a laboratory for repair (and friend of mine did the same)
- >but they're not able to reproduce the power-fault when the radio is on their
- >table. They cleaned up all the relais, but the RTX is still loosing power.
-
- This sounds suspiciously like a problem I had with my 430 on voice. It
- would behave quite similarly, losing power and becoming distorted on an
- occasional basis. There was a well reported problem with early 430's
- where the finals were riveted, but not soldered, and the rivets could
- eventually develop a high electical resistance, with ensuing power problems.
- This was diagnosed and corrected by Kenwood early, so I doubt it would be a
- problem in a unit manufactured as late as yours. (I bought mine in late
- 1984, and it already had a modified PA -- believe me, I checked!)
-
- My problem turned out to be a marginal connection in the internal switch
- on the XVTR jack on the back of the rig. This is the connector with 8 pins.
- The switch is integral to the connector and works when the plug is inserted.
- The fix was to insert and remove the plug in the jack several times. Since
- I have done this, my 430 has never shown this symptom again.
-
- I wish I could claim to have deduced this myself, but it was pointed out to
- me by a friend who read it in a snippet from someone in QST. To whoever
- took the time to send in that suggestion, I am eternally grateful. Hope
- this solves your problem, too.
- --
- Rob Stampfli rob@colnet.cmhnet.org The neat thing about standards:
- 614-864-9377 HAM RADIO: kd8wk@n8jyv.oh There are so many to choose from.
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- To all Kenwood users:
-
- The 430 has a corresponding problem to the older rigs:
- specifically the 520(S), 820(S), 530S, and 830S rigs....
-
- Power drops while running... if this occurs, tighten the screws on the
- driver board and IF board.
-
- Had this happen to me and friends a few times...also watch out for the
- coax connector on the back...they get loose too...no lock washer on the
- back.
-
- 73,
- Tom
- wb9rxj@uiuc.edu
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
-
- Diego,
- I had a similar problem with a 430. Mine was
- intermittent. Finally one cold day [0c] it
- became permanent. I traced my problem to an
- open via connection on one of the final transistor
- bases. This resulted in that device not getting
- a dc return to ground. I re-soldered the via to
- my success!
-
- I found it by checking dc bias on each final trans-
- istor and found one being different in voltage reading.
-
- Good luck,
- regards
-
- George Hawkins
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
- Here is a solution I heard of for a problem like yours. Perhaps it
- will be of use to you. Luckily, I have not had any problems with my
- TS430S. I'm very pleased with it.
-
-
- Hope this is of use to you.
-
- 73 es GL.... Mark KG7JL
-
- --------------------------
- KD7EV advises intermittent power output problems on his '430 was
- cured by
- installing a more conventional nut on the rear panel UHF style
- antenna
- connector. Apparently a faulty ground connection at this point
- caused a change
- in the VSWR which affected the sensing circuit and thus reducing the
- RF output
- power.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
-
- Guarda che io ho lo stesso problema con un ICOM IC-745. Ogni tanto la
- c'e' una protezione che va in funzione e la potenza va giu'. Nel caso
- mio probabilmente c'e' un problema di corrente di fuga da compensare
- opportunamente, ma per te potresti provare a vedere se con una semplice
- vantola puoi risolvere il caso. Infine, tanto per confermare che per me
- i diavoletti che muovono gli elettroni esistono, il problema c'e' solo
- di estate, quando la temperatura esterna e' sopra i 20 gradi (... qui in
- Olanda). Faccio notare che dentro casa la temperatura e' circa la stessa.
-
- Saluti
-
- I0WTD-PA3FWP
- Stefano
-
- (In this article Stefano I0WTD told that he had a similar problem on his IC745
- and suggested to put a blower on the radio to solve it out. 'His' power fault
- happened only on summer. (mine in winter too !!) ik3huk)
- -------------------------------------------------------------------------------
- Diego Serafin - IK3HUK --------------------}-------
- ik3huk@sabrina.dei.unipd.it ___++_______/ \__}_____++__
-
- Copied from the QRZ! Windows Ham Radio CDROM
-
-