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I am reducing FT-857D MAX RF Power to 50W by the Service Menu for JA¡¯s mobile station application.
It would be very much appreciated if someone could answer my following questions.
1. For what do the MID2, MID1, MIN work?
2. Are there any other values of the Service Menu that I need to change when changing the RF power?
Thanks in advance.
73/88,
// HIRO, JJ1FXF
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Get yourself a copy of the Yaesu FT-857D Technical Supplement - Page Alignment-10 covers this.?
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Thanks for introducing a document I haven¡¯t heard about.
I still cannot find the ¡°FT-857D Technical Supplement¡± manual but will try finding it and read the page carefully.
TU!
// HIRO, JJ1FXF
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Here You Go
Tech. supp.
Brian ? ?N7BMH
On Tuesday, January 23, 2024 at 03:24:54 PM MST, HIRO, JJ1FXF <jj1fxf@...> wrote:
Thanks for introducing a document I haven¡¯t heard about.
I still cannot find the ¡°FT-857D Technical Supplement¡± manual but will try finding it and read the page carefully.
TU!
// HIRO, JJ1FXF
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Brian-san,
Thank for your info.
I¡¯m on a train commuting to my office and the access to the net seems jammed and the download is very slow.
I¡¯ll get it when I¡¯m home later.
Thank you.
73,
// HIRO, JJ1FXF
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Your Welcome
Let me know if it helps.
Brian ? ? N7BMH
On Tuesday, January 23, 2024 at 03:53:33 PM MST, HIRO, JJ1FXF <jj1fxf@...> wrote:
Brian-san,
Thank for your info.
I¡¯m on a train commuting to my office and the access to the net seems jammed and the download is very slow.
I¡¯ll get it when I¡¯m home later.
Thank you.
73,
// HIRO, JJ1FXF
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For some reason Brian¡¯s link didn¡¯t work for me but I found it in the Internet Archive page. ?
? 73 de Alex VK2PIR ?
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From: [email protected] [mailto:[email protected]] On Behalf Of pth@...
Sent: Wednesday, 24 January 2024 9:46 AM
To: [email protected]
Subject: Re: [FT-857] FT-857D RF Power Mod? On Tuesday, January 23, 2024 at 03:24:54 PM MST, HIRO, JJ1FXF <jj1fxf@...> wrote: Thanks for introducing a document I haven¡¯t heard about.
I still cannot find the ¡°FT-857D Technical Supplement¡± manual but will try finding it and read the page carefully.
TU!
// HIRO, JJ1FXF
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Both worked for me although Brian's is
a newer revision (2018 versus 2003).
73,
Kent
K9ZTV
On 1/23/2024 5:46 PM, Alex Sentana via
groups.io wrote:
toggle quoted message
Show quoted text
For
some reason Brian¡¯s link didn¡¯t work for me but I found it
in the Internet Archive page.
?
?
73
de Alex VK2PIR
?
?
On Tuesday,
January 23, 2024 at 03:24:54 PM MST, HIRO, JJ1FXF <jj1fxf@...>
wrote:
Thanks for
introducing a document I haven¡¯t heard about.
I still cannot find the ¡°FT-857D Technical
Supplement¡± manual but will try finding it and read
the page carefully.
TU!
// HIRO, JJ1FXF
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Thanks to both Alex-san and Kent-san.
The exact "Yaesu FT-857D Technical Supplement - Page Alignment-10" is on the 2017 (not 2018?) version.
But the content seems the same as Page #20 of the 2003 version.
TU 73,
// HIRO, JJ1FXF
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On 2024.01.23 02:20, HIRO, JJ1FXF wrote: I am reducing FT-857D MAX RF Power to 50W by the Service Menu for JA¡¯s mobile station application.
It would be very much appreciated if someone could answer my following questions.
1. For what do the MID2, MID1, MIN work? snip Thanks in advance.
73/88,
// HIRO, JJ1FXF Hullo Hiro, These Service Menu settings are published under the headling "RF Power Adjustment." My best guess as to how they work is: 024 - 039 are to calibrate, or set in some fashion, points at the frequencies listed so the RF power level operation by the operator may be relatively accurate across the range MF/HF/50 MHz. 040 - 044 similarly perform a calibration across the 144 and 432 MHz range. In other words a way of calibrating or ensuring that the general operator/operating menu setting 075 RF POWER SET works across those ranges. i.e. In many regions, 075 reads from: MF/HF 0 - 100 W; 144 MHz 0 - 50 W; and 432 MHz 0 - 20 W. Maximum will be lower in Japan, and possibly another area. 73, John -- John D Erskine VE7MHI VA7OTC CN88hk VA7RCN Victoria, B.C.
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John-san,
Thanks for your comments.
Yes, the "075 RF POWER SET" of the Standard Menu is to control the percentage of the "*-MAX" of the Service Menu.
Could you guess what the "*-MID2/MID1/MIN" will affect?
// HIRO, JJ1FXF
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If you can, always refer to the 2018 version. It has all revisions of PCBs used in this model and from memory there was some revised alignment ? Been a long long time since I serviced these for DSE so I may be wrong. 73 de ZL1CVD
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ZL1CVD OM,
TNX for your comment.
I found that the last page of 2018 doc says 2017 and so I misunderstood.
Now I have found the Technical Supplement of 2003, 2005, 2007, and 2018.
Thank you, all who replied to me.
Have a good day.
73/88,
// HIRO, JJ1FXF
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Hi Hiro, JJ1FXF,
Curious as to why you are lowering the max RF power on your 857 to 50 watts??
I have been a member of this group for quite a while but have not followed the discussions as I haven't used my 857 in a couple of years so I may have missed the reasoning.
?
Is this to protect the 857 from some type of failure??
Thanks
73, N7KBC
Dwight
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Seems to me hams in Japan operating portable or mobile are limited to 50 watts max, though I may be wrong. This is why some hams outside of Japan need to be cautious at buying a radio that was built for use in Japan.
On Mon, Feb 19, 2024 at 11:22, rifkum via groups.io <rifkum@...> wrote: Hi Hiro, JJ1FXF,
Curious as to why you are lowering the max RF power on your 857 to 50 watts??
I have been a member of this group for quite a while but have not followed the discussions as I haven't used my 857 in a couple of years so I may have missed the reasoning.
?
Is this to protect the 857 from some type of failure??
Thanks
73, N7KBC
Dwight
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Regarding the RF output, radio manufacturers here in Japan usually sell three types of the same HF radio, 10W, 50W and 100W.
As for the FT-857D, FT-857D is for 100W, FT-857DM is for 50W and FT-857DS is for 10W.
In the auction markets here, the most expensive used 857D is 857DM, 50W for mobile use.
// HIRO, JJ1FXF
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As Ted-san said, JA¡¯s mobile station license is up to 50W and fixed station license is 1kW.
I¡¯m a fixed station and want to use the US 857D for my mobile license.
// HIRO, JJ1FXF
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I? am by no means an expert on Japanese radio regulations, but I believe that the radio needs to be recognized as an approved radio for the class of usage.?
I know that the Japanese radios are not generally as modifyable as the rest of the world radios, but in the setup memory there are settings to set the power levels in the US radios.
Perhaps these alignment menu would give you the ability to modify your radio for a maximum 50 watts?
At any rate I believe that modifying the radio would be difficult to get approved by the Japanese version of the FCC.
?
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Barron-san,
Thanks for your comment.
To use the homebrew radios or mod radios on the air, we need to verify the radios that they are compliant to the current regulations such as spurious emissions and limiting RF output, and then need to submit the evidences.
Hardware modifications with some photos are OK as the evidences but software configurations are hard to guarantee that the radios are compliant.
So I verified my 857D at an official lab and got a signed paper that my radio is compliant now.
JA regulations are a bit troublesome for amateur radio freaks, anyway. hihi
// HIRO, JJ1FXF
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A couple other things to note:
The service menu setting No. 017 - Vcc. It is factory set to "138" (13.8 volts applied to the FT897 power input). If your input voltage is something other than 13.8 volts and you don't change this setting before saving any other changes, the voltage displayed on the display will be incorrect. You need to measure the input voltage you are using with an accurate voltmeter and then change the No. 017 menu number to that for the displayed voltage to be correct. For instance, I am using a power supply set to 12.6 volts. I change the No. 017 menu number to "126." Then I save the service menu settings. Now my radio displays the correct input voltage, whatever it is.
Also, I have some microwave transverters which cannot use an input power level at the IF frequency of 144 MHz beyond about 2.5 watts. On 144 MHz, with the service menu settings calibrated according to the technical supplement, the lowest power the radio puts out is 5 watts with the normal menu setting 075, RF Power Set, set to 5. I really don't care much about the power settings if I can get the power out to be around 2 watts or lower. For my radio, setting the Service Menu No. 042, VHF-PO-MIN, to 0 produces a power output of 1.5 watts on 144 MHz with the main menu 075 set to 5. This is acceptable for my transverter. But this may be something most users aren't going to bother with.
Note, I am measuring all power levels with a Bird 43 wattmeter and the appropriate slugs.
73, Zack W9SZ
On Tue, Jan 23, 2024 at 4:20?AM HIRO, JJ1FXF < jj1fxf@...> wrote: I am reducing FT-857D MAX RF Power to 50W by the Service Menu for JA¡¯s mobile station application.
It would be very much appreciated if someone could answer my following questions.
1. For what do the MID2, MID1, MIN work?
2. Are there any other values of the Service Menu that I need to change when changing the RF power?
Thanks in advance.
73/88,
// HIRO, JJ1FXF
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HIRO, JJ1FXF
Chris, ZL1CVD
John D Erskine VE7MHI VA7OTC