[Kenwood] ALC with Kenwood TS-830S

Tue Mar 30 03:21:26 EDT 2021

Previously I had my TS-530S (older version of the 830S) into the linear
and was using the CARRIER control knob with ok results. However it was in
to the RESISTIVE input of the Thunderbolt - its 350ohms, so plenty of 
excitation
drive was lost in the form of heat on an internal RF choke that blew 2 times 
so far.

The LC networks in the amp for each band only need 5-10w and I am told work 
more efficiently.

With the CARRIER knob, I could vary my linears output from 50-500watts 
nicely, but of course at the expense of
loosing the RF choke and damaging the linear pretty badly.

I am thinking ideally, I need an attenuator that will vary 5 to 10W very 
slowly if I want to see that kind of control.

The CARRIER control on the 830 is for sure not nearly as linear, and brings 
me to well over 15W just about any position.
I may be able to alter that a little withthe DRIVE control, but as someone 
mentioned, I can loose incoming rx RF gain.

Steve
KA2PTE

----- Original Message ----- 
From: "Clif Holland" <clif at avvid.com>
To: <kenwood at mailman.qth.net>
Sent: Monday, March 29, 2021 7:49 PM
Subject: Re: [Kenwood] ALC with Kenwood TS-830S

> Only in CW, doesn't affect SSB. Just remember that whatever attenuator you 
> use, unless wired into the amp, will also affect the RX.
>
> Clif Holland KA5IPF
> www.avvid.com
>
> On 3/29/2021 6:02 PM, Renee K6FSB wrote:
>> silly Question-
>> does the rig have a carrier level control around the outside of the mic 
>> control? IIRC you can turn the output down to minimum....I could be 
>> wrong.....
>> Renée
>>
>> On 3/29/21 12:49 PM, Rick Bates, NK7I wrote:
>>> I'll state what should be obvious... make SURE the attenuator pad in the 
>>> transmit path, switched out while receiving (DOH!). There likely is/was 
>>> a pad already in place within the amp (unless modified for non-ham use). 
>>> Perhaps it is bypassed?
>>>
>>> In the interim, grossly under driving audio would have similar effects, 
>>> but for CW you'll need a pad. Unless the rig has a drive level control 
>>> (I haven't played with an 830) for power out control.
>>>
>>> Yes, the attenuator would stop the oops factor.
>>>
>>> 73,
>>> Rick NK7I
>>>
>>> On 3/29/2021 12:07 PM, Steve H wrote:
>>>> Rick
>>>>
>>>> I guess I need an attenuator then. It would have to be able to take 
>>>> 100W
>>>> and bring it down to 5-10w for the hf bands.
>>>>
>>>> -- 
>>>> Steve Hearns
>>>> KA2PTE
>>>>
>>>> ----- Original Message ----- From: "Rick NK7I" <rick.nk7i at gmail.com>
>>>> To: <kenwood at mailman.qth.net>
>>>> Sent: Monday, March 29, 2021 2:32 PM
>>>> Subject: Re: [Kenwood] ALC with Kenwood TS-830S
>>>>
>>>>
>>>>> Steve,
>>>>>
>>>>> I haven't done this. Traditional wisdom is to NOT use the ALC to limit 
>>>>> the amp, that causes issues like flat topping and distortion of the 
>>>>> audio.
>>>>>
>>>>> If you're using an audio mode, try providing less audio (less drive). 
>>>>> Or put an attenuator pad on the amp input so it requires more drive 
>>>>> (which must be able to safely dissipate that power).
>>>>>
>>>>> 73,
>>>>> Rick NK7I
>>>>>
>>>>>
>>>>> On 3/29/2021 11:23 AM, Steve H wrote:
>>>>>>
>>>>>> Trying out this alternative to using an attenuator
>>>>>> with my 830S and an older linear that only needs 5-10W to excite.
>>>>>>
>>>>>> Was told to get pin 6 on the remote connector din and get a 9v 
>>>>>> battery with
>>>>>> a 225k potentiometer on it and feed the wiper as per the attached
>>>>>> illustration.
>>>>>>
>>>>>> Thats seems to be for the 520/820s now that I notice. Turns out all 
>>>>>> the
>>>>>> hybrids use pin 6 for the alc, but I notice they are putting the gnd 
>>>>>> into
>>>>>> pin 4 on this diagram.
>>>>>>
>>>>>> https://www.mediafire.com/view/5sf9ovlmvhvkqjv/alc.jpg/file
>>>>>>
>>>>>>
>>>>>> I had tried this but used the chassis ground and pin 6
>>>>>> thinking that would work, but it does not have any effect. Pin 4 on 
>>>>>> the 830
>>>>>> is to the NO contact of the control relay, so I dont think this will 
>>>>>> work.
>>>>>>
>>>>>> Has anyone used the ALC on their 830 to limit input to their linear?
>>>>>>
>>>>>>
>>>>>>
>>>>>> Steve
>>>>>> KA2PTE
>>>>>>
>>>>>> ______________________________________________________________
>>>>>> Kenwood mailing list
>>>>>> Home: http://mailman.qth.net/mailman/listinfo/kenwood
>>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>>> Post: mailto:Kenwood at mailman.qth.net
>>>>>>
>>>>>> This list hosted by: http://www.qsl.net
>>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>> ______________________________________________________________
>>>>> Kenwood mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/kenwood
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:Kenwood at mailman.qth.net
>>>>>
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>
>>>> ______________________________________________________________
>>>> Kenwood mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/kenwood
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:Kenwood at mailman.qth.net
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>> ______________________________________________________________
>>> Kenwood mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/kenwood
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Kenwood at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>
>> ______________________________________________________________
>> Kenwood mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/kenwood
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Kenwood at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html 