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Internal Tuner Proposal

 

I have an FT-857D and an FT-897. I have been using the FT-857 for portable operation and use an external ATU-100 tuner when required.
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?I do miss an internal tuner so I an thinking of constructing and mounting a ATU-100 board in the bottom battery compartment of the FT-897. Here is a link to the ATU-100 tuner kit:
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<https://www.amazon.com/Malahit-1-8-50MHz-Automatic-Programmed-Unassembled/dp/B099WR89P2/>
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Has anyone tried installing a tuner such as this one? that compartment? I use external LiFePO4 batteries so the internal batteries have been removed (they stopped holding a charge years ago).
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Looking forward to the warmer weather to operate portable.
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73 Mike N2MS
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Hmmmm - I'm unsure that this is a good idea without some additional steps. My concern is that you are adding something that can generate heat into a rather small case where the manufacturer has not already made allowances for this quantity of heat generation. I am especially concerned where the SWR is high, as I would expect more heat to be generated.

Are you going to add a small fan or the like to help dissipate any additional heat???

73 de Lee KX4TT



On Wednesday, February 19, 2025 at 10:55:39 AM EST, Mike N2MS via groups.io <mstangelo@...> wrote:

?
?I do miss an internal tuner so I an thinking of constructing and mounting a ATU-100 board in the bottom battery compartment of the FT-897. Here is a link to the ATU-100 tuner kit:
?
<https://www.amazon.com/Malahit-1-8-50MHz-Automatic-Programmed-Unassembled/dp/B099WR89P2/>
?
Has anyone tried installing a tuner such as this one? that compartment? I use external LiFePO4 batteries so the internal batteries have been removed (they stopped holding a charge years ago).
?
Looking forward to the warmer weather to operate portable.
?
73 Mike N2MS
?
_.
 

Thee ATU-100 does not dissipate much heat. Also keep in mind Yaesu had an optional swotching power supply that would mount in that space and dissipate much more heat than the tuner.

Mike N2MS

On 02/19/2025 11:09 AM EST Lee via groups.io <kx4tt@...> wrote:


Hmmmm - I'm unsure that this is a good idea without some additional steps. My concern is that you are adding something that can generate heat into a rather small case where the manufacturer has not already made allowances for this quantity of heat generation. I am especially concerned where the SWR is high, as I would expect more heat to be generated.

Are you going to add a small fan or the like to help dissipate any additional heat??

73 de Lee KX4TT



On Wednesday, February 19, 2025 at 10:55:39 AM EST, Mike N2MS via groups.io <mstangelo@...> wrote:


I do miss an internal tuner so I an thinking of constructing and mounting a ATU-100 board in the bottom battery compartment of the FT-897. Here is a link to the ATU-100 tuner kit:

<>

Has anyone tried installing a tuner such as this one that compartment? I use external LiFePO4 batteries so the internal batteries have been removed (they stopped holding a charge years ago).

Looking forward to the warmer weather to operate portable.

73 Mike N2MS

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Hi Mike,

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Using the battery compartment in the 897 should be easy.

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I have made a couple of the ATU-100’s and installed one inside a Codan 8528 very successfully. There is a lot less space in the Codan than in the 897.

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The only problem will be where to mount the display and the control buttons – maybe remove the battery switch in the top and mount them there?

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73….Eric VK2VE.

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From: [email protected] <[email protected]> On Behalf Of Mike N2MS via groups.io
Sent: Thursday, 20 February 2025 02:56
To: [email protected]
Subject: [FT-857] Internal Tuner Proposal

?

I have an FT-857D and an FT-897. I have been using the FT-857 for portable operation and use an external ATU-100 tuner when required.

?

?I do miss an internal tuner so I an thinking of constructing and mounting a ATU-100 board in the bottom battery compartment of the FT-897. Here is a link to the ATU-100 tuner kit:

?

<>

?

Has anyone tried installing a tuner such as this one? that compartment? I use external LiFePO4 batteries so the internal batteries have been removed (they stopped holding a charge years ago).

?

Looking forward to the warmer weather to operate portable.

?

73 Mike N2MS

?


Virus-free.
 

Eric,

Thanks for the feedback. I will look at the battery swich.

73 Mike N2MS

On 02/19/2025 4:57 PM EST Eric van de Weyer <groups.io@...> wrote:


Hi Mike,

Using the battery compartment in the 897 should be easy.

I have made a couple of the ATU-100’s and installed one inside a Codan 8528 very successfully. There is a lot less space in the Codan than in the 897.

The only problem will be where to mount the display and the control buttons – maybe remove the battery switch in the top and mount them there?

73….Eric VK2VE.

From:[email protected] <[email protected]> On Behalf OfMike N2MS via groups.io
Sent: Thursday, 20 February 2025 02:56
To: [email protected]
Subject: [FT-857] Internal Tuner Proposal

I have an FT-857D and an FT-897. I have been using the FT-857 for portable operation and use an external ATU-100 tuner when required.

I do miss an internal tuner so I an thinking of constructing and mounting a ATU-100 board in the bottom battery compartment of the FT-897. Here is a link to the ATU-100 tuner kit:

<>

Has anyone tried installing a tuner such as this one that compartment? I use external LiFePO4 batteries so the internal batteries have been removed (they stopped holding a charge years ago).

Looking forward to the warmer weather to operate portable.

73 Mike N2MS

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