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Re: [TenTec] Orion 565 PA adjustment

To: tentec@contesting.com
Subject: Re: [TenTec] Orion 565 PA adjustment
From: Bob McGraw <rmcgraw@blomand.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 13 Feb 2021 14:07:00 -0600
List-post: <mailto:tentec@contesting.com>
Your will need to put a DC amp meter in series with the 13.8 V red wire from the power distribution board going into the PA box. With the radio in USB mode, mike audio to minimum, key the transmitter and adjust both pots for minimum current.  Then adjust R19, driver bias, for an increase of 50 ma.  Then adjust R15, PA bias, for and additional increase of 500 ma.   Remove the meter and reconnect the red wire to the power distribution board.

73

Bob, K4TAX


On 2/13/2021 12:46 PM, Onno PA1AP wrote:
Hi,

Hope someone has experience how to align / adjust the two potentiometers
within the pa? I found the pa is unstable and power output fluctuating and
expect the potentiometer or any component surrounding the bias might be
defective.

Hope someone can share experience.

Regards and thanks Onno pa1ap

Op za 13 feb. 2021 18:00 schreef <tentec-request@contesting.com>:

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Today's Topics:

    1. Re: For Sale: Ten-Tec OMNI VI (Richard Bell)
    2. Fwd: [TentecOrionSeries] Orion II sub receiver problem
       (Barry Simpson)
    3. Paragon 585 Pass Band Tuning VXCO Replacement Crystal
       Available (Brian Holmes)


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Message: 1
Date: Fri, 12 Feb 2021 11:11:08 -0600
From: Richard Bell <richfbell@sbcglobal.net>
To: tentec@contesting.com
Subject: Re: [TenTec] For Sale: Ten-Tec OMNI VI
Message-ID: <45D610D3-CF8E-4052-9B17-8075F1AF4A27@sbcglobal.net>
Content-Type: text/plain; charset=utf-8

When you say doesn?t work, what?s the issue?

73 W5BXE

Date: Thu, 11 Feb 2021 23:25:08 -0500
From: David Perrin <dbperrin@gmail.com>
To: Tentec reflector <tentec@contesting.com>
Subject: [TenTec] For Sale: Ten-Tec OMNI VI...
Message-ID: <3F942583-D041-43C9-8B42-588894A6BBF7@gmail.com>
Content-Type: text/plain;    charset=utf-8

Selling my best radio ever!  But, it doesn?t work well now.

This is an OMNI VI with factory option 3,  it has all the filters.

It has been one of two main rigs for years. Non smoking

I can send picts of it, but I will need to message them to you.

The rig doesn?t have a scratch.

The radio was sent to Ten-Tec a few years ago for  an alignment.

$300 in central FL.








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------------------------------

Message: 2
Date: Sat, 13 Feb 2021 16:55:01 +1100
From: Barry Simpson <vk2bj@optusnet.com.au>
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>,
         TentecOrionSeries@groups.io
Subject: [TenTec] Fwd: [TentecOrionSeries] Orion II sub receiver
         problem
Message-ID:
         <
CA+03d8hrv02yG5DnxiirL_fqEhmi+RDUHnuFKkJUmB0q2h6nfA@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

Orion II Sub-receiver problem - solved !!

I posted the message below on 18 January 2021 and as I have now solved the
problem, I thought that sharing the solution might be useful to fellow
Orion II users in the event they have similar sub receiver issues.

In summary, I spent very many hours in fruitless fault finding including
reflowing all soldered joints on the sub receiver board and changing all
the electrolytic capacitors.

Eventually, using some Freezit spray, I detected a reduction in the
crashing noise when I sprayed the ceramic IF Filter marked CQ 33-450E.

Googling that filter then brought up a host of similar problems people had
had with those types of ceramic filters in other Ten Tec models (strangely
no mention of the Orion or Orion II) and other rigs such as the Kenwood
TS2000 and some Icom rigs.

I have removed the filter and broken it open, finding some horribly
discoloured plates inside as expected from my Google searches.

Temporarily I have bridged the filter circuit with a .01 UF capacitor and
the sub receiver works like new with no crashes and bangs.

The filter is out of production but I have found an electronics dealer in
Poland who has them (or their equivalent) and I have half a dozen on the
way to me mainly as spares for any future issues.

73

Barry Simpson  VK2BJ

---------- Forwarded message ---------
From: Barry Simpson - VK2BJ via groups.io <vk2bj.au=gmail.com@groups.io>
Date: Mon, 18 Jan 2021 at 21:00
Subject: [TentecOrionSeries] Orion II sub receiver problem
To: <TentecOrionSeries@groups.io>, Discussion of Ten-Tec Equipment <
tentec@contesting.com>


I have a very recently acquired late serial number (black knobs) Orion II
which is in immaculate condition outside and inside.

I have not used it very much since I bought it just prior to Christmas but
yesterday I noticed that the sub receiver (standard model sub receiver) was
making intermittent loud crashing noises like receiving static and the sub
S meter was registering those crashes. The rig had been on most of the day
in a fairly warm room.

However, there were no such static crashes as the main receiver was working
perfectly.

Tonight, I took out the sub receiver board and cleaned all the
pins/connectors although I could not see any tarnishing anywhere.

That did nothing to cure the problem which still occurs with the antenna
connected to a dummy load.

It does not seem to occur immediately when the rig is switched on from cold
but it gradually gets worse as it warms up.

I have not identified anything specific to trigger or make the crashes
worse by tapping on components and screening boxes and wiggling capacitors
and connecting leads.

Before I start dismantling the rig and investigating further, I wonder if
anyone can identify the symptoms and suggest a possible cause.

The only thing I can think of at the moment is the power board capacitor
problem but I do not know how that would result in what I am experiencing.

All and any suggestions and pearls of wisdom would be appreciated.

Thank you in advance.

Barry Simpson  VK2BJ
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------------------------------

Message: 3
Date: Sat, 13 Feb 2021 08:39:11 -0500
From: Brian Holmes <brian@rocketperformance.com>
To: tentec@contesting.com
Subject: [TenTec] Paragon 585 Pass Band Tuning VXCO Replacement
         Crystal Available
Message-ID:
         <D0B5533F-8355-45E8-BDBD-E5434FF8AE69@rocketperformance.com>
Content-Type: text/plain; charset=utf-8


?The VXCO on my pass band tuning board shifted 12-15 kHz low in frequency
which was outside of the center frequency of all of the filters.  As a
result, only the 6 kHz  (i.e. no filter) BW position worked.

Since no spares of that part were available and since I was concerned
about just putting a spare board in only to perhaps have the same issue, I
ordered a new crystal from Bomar. Two crystals was the same price as one
so, if anyone needs a crystal, let me know.  All charge half of what I paid
plus shipping.

I put the rock in and it bang on. Very happy with it.

Thanks,

Brian
VE3IK


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