[TenTec] Orion 565 PA adjustment
Bob McGraw
rmcgraw at blomand.net
Sat Feb 13 15:07:00 EST 2021
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 at contesting.com>:
>
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>> Today's Topics:
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>> 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)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 12 Feb 2021 11:11:08 -0600
>> From: Richard Bell <richfbell at sbcglobal.net>
>> To: tentec at contesting.com
>> Subject: Re: [TenTec] For Sale: Ten-Tec OMNI VI
>> Message-ID: <45D610D3-CF8E-4052-9B17-8075F1AF4A27 at 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 at gmail.com>
>>> To: Tentec reflector <tentec at contesting.com>
>>> Subject: [TenTec] For Sale: Ten-Tec OMNI VI...
>>> Message-ID: <3F942583-D041-43C9-8B42-588894A6BBF7 at 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.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ------------------------------
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Sat, 13 Feb 2021 16:55:01 +1100
>> From: Barry Simpson <vk2bj at optusnet.com.au>
>> To: Discussion of Ten-Tec Equipment <tentec at contesting.com>,
>> TentecOrionSeries at groups.io
>> Subject: [TenTec] Fwd: [TentecOrionSeries] Orion II sub receiver
>> problem
>> Message-ID:
>> <
>> CA+03d8hrv02yG5DnxiirL_fqEhmi+RDUHnuFKkJUmB0q2h6nfA at 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 at groups.io>
>> Date: Mon, 18 Jan 2021 at 21:00
>> Subject: [TentecOrionSeries] Orion II sub receiver problem
>> To: <TentecOrionSeries at groups.io>, Discussion of Ten-Tec Equipment <
>> tentec at 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 at rocketperformance.com>
>> To: tentec at contesting.com
>> Subject: [TenTec] Paragon 585 Pass Band Tuning VXCO Replacement
>> Crystal Available
>> Message-ID:
>> <D0B5533F-8355-45E8-BDBD-E5434FF8AE69 at 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
>>
>>
>> ------------------------------
>>
>> Subject: Digest Footer
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>> ------------------------------
>>
>> End of TenTec Digest, Vol 218, Issue 9
>> **************************************
>>
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