Re: 60 Meter Transmit Mod Info Wanted
The 48 Mhz is way before the PA.? I forget the exact figure, but it was not many dB down from the 70 Mhz signal
On Sat, 25 Mar 2023, 13:22 Andrew Lenton, < a@...> wrote: The pre amp mod that replaces the 4 m borad is no longer available, I have the Gerber files and a few boards made. All the parts are surface mount, there is one mc109 coil for tuning. This mod brings the 4M RX performance beyond the 6 M performance!
TX BPF mod, will give you 85 Watts on TX, you could add a further 70MHZ BPF if you wish, to bring the 2nd harmonic down a bit more.
I have done the above mod on two FT 847, and they worked extremely well, I sold them both in a weak moment!
BR
Andrew
Sent from
The 60 metre mod is easily done by simply widebanding the radio.? 60 metres is not in the processor, as 60 metres was not thought of when the radio was new.? Ref 4 metres, I looked in to doing the mods, and came to the conclusion that a transverter was both easier and cheaper.? The TX output is easy, removing one cap in PA, but if looking at a SA on the output, there are nasty sprogs at around 48 Mhz that would need filtering out, which involves messing with bpf.?
HI, how are you getting on with the information for your mod information requested? It seems to have stopped are you having it done? Are you going to do it yourself??
Is there anybody who is willing to do the mod on an 847 as suggested by Leighton GW3FSP.
Best regards
Sent from Jeff M0UHF
> On 24 Mar 2023, at 12:30, gw3fsp via <gw3fsp.ldavies=[email protected]> wrote:
>
> ?Hi there, that info was released by Yeasu quite a few years ago, there is no update now, somewhere there is a 4M pre-amp available for the 847 along with details of how to modify the bandpass filters to allow much higher power out and drastically reduce the current taken when on 4M, both my 847's are fitted with the preamps and filters modified, have not seen the mod mentioned since.
> Leighton.? ? ? GW3FSP.
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Re: 60 Meter Transmit Mod Info Wanted
The pre amp mod that replaces the 4 m borad is no longer available, I have the Gerber files and a few boards made. All the parts are surface mount, there is one mc109 coil for tuning. This mod brings the 4M RX performance beyond the 6 M performance!
TX BPF mod, will give you 85 Watts on TX, you could add a further 70MHZ BPF if you wish, to bring the 2nd harmonic down a bit more.
I have done the above mod on two FT 847, and they worked extremely well, I sold them both in a weak moment!
BR
Andrew
The 60 metre mod is easily done by simply widebanding the radio.? 60 metres is not in the processor, as 60 metres was not thought of when the radio was new.? Ref 4 metres, I looked in to doing the mods, and came to the conclusion that a transverter was both easier and cheaper.? The TX output is easy, removing one cap in PA, but if looking at a SA on the output, there are nasty sprogs at around 48 Mhz that would need filtering out, which involves messing with bpf.?
HI, how are you getting on with the information for your mod information requested? It seems to have stopped are you having it done? Are you going to do it yourself??
Is there anybody who is willing to do the mod on an 847 as suggested by Leighton GW3FSP.
Best regards
Sent from Jeff M0UHF
> On 24 Mar 2023, at 12:30, gw3fsp via <gw3fsp.ldavies=[email protected]> wrote:
>
> ?Hi there, that info was released by Yeasu quite a few years ago, there is no update now, somewhere there is a 4M pre-amp available for the 847 along with details of how to modify the bandpass filters to allow much higher power out and drastically reduce the current taken when on 4M, both my 847's are fitted with the preamps and filters modified, have not seen the mod mentioned since.
> Leighton.? ? ? GW3FSP.
>
>
>
>
>
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Re: 60 Meter Transmit Mod Info Wanted
The 60 metre mod is easily done by simply widebanding the radio.? 60 metres is not in the processor, as 60 metres was not thought of when the radio was new.? Ref 4 metres, I looked in to doing the mods, and came to the conclusion that a transverter was both easier and cheaper.? The TX output is easy, removing one cap in PA, but if looking at a SA on the output, there are nasty sprogs at around 48 Mhz that would need filtering out, which involves messing with bpf.?
HI, how are you getting on with the information for your mod information requested? It seems to have stopped are you having it done? Are you going to do it yourself??
Is there anybody who is willing to do the mod on an 847 as suggested by Leighton GW3FSP.
Best regards
Sent from Jeff M0UHF
> On 24 Mar 2023, at 12:30, gw3fsp via <gw3fsp.ldavies=[email protected]> wrote:
>
> ?Hi there, that info was released by Yeasu quite a few years ago, there is no update now, somewhere there is a 4M pre-amp available for the 847 along with details of how to modify the bandpass filters to allow much higher power out and drastically reduce the current taken when on 4M, both my 847's are fitted with the preamps and filters modified, have not seen the mod mentioned since.
> Leighton.? ? ? GW3FSP.
>
>
>
>
>
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Re: 60 Meter Transmit Mod Info Wanted
HI, how are you getting on with the information for your mod information requested? It seems to have stopped are you having it done? Are you going to do it yourself?
Is there anybody who is willing to do the mod on an 847 as suggested by Leighton GW3FSP.
Best regards
Sent from Jeff M0UHF
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On 24 Mar 2023, at 12:30, gw3fsp via groups.io <gw3fsp.ldavies@...> wrote:
?Hi there, that info was released by Yeasu quite a few years ago, there is no update now, somewhere there is a 4M pre-amp available for the 847 along with details of how to modify the bandpass filters to allow much higher power out and drastically reduce the current taken when on 4M, both my 847's are fitted with the preamps and filters modified, have not seen the mod mentioned since.
Leighton. GW3FSP.
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Re: 60 Meter Transmit Mod Info Wanted
Hi there, that info was released by Yeasu quite a few years ago, there is no update now, somewhere there is a 4M pre-amp available for the 847 along with details of how to modify the bandpass filters to allow much higher power out and drastically reduce the current taken when on 4M, both my 847's are fitted with the preamps and filters modified, have not seen the mod mentioned since.
Leighton. GW3FSP.
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Re: 60 Meter Transmit Mod Info Wanted
Leighton,
yes that was the cause of the issue all of the documentation is so very old and conflicting
but I can confirm that it works well on 60M
the 40M bandpass filter covers from 5 to 7.5Mhz
as the radio has the Alaska emergency frequency?5.1675Mhz
from the factory.
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Re: 60 Meter Transmit Mod Info Wanted
Unfortunately it does not include coverage of the 5Mhz band as far as I can see.
Leighton. GW3FSP.
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Re: 60 Meter Transmit Mod Info Wanted
Hi there, there is a list of frequencies covered after the mod included in the info, as always a full reset is required after changing any of the links to make sure the processor picks up the new band info, Ihave done this mod to both my 847's with no problems what so ever.
Leighton. GW3FSP.
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Re: 60 Meter Transmit Mod Info Wanted
Morning Leighton
yes thats where the info comes from??
but it is clear as mud from the chart what the consequences of the changes are
the big missing bit is full reset? (FAST+LOCK and power on)??
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Re: 60 Meter Transmit Mod Info Wanted
Hi there, there is a mod sheet in the Files section from Yeasu - Band modifications for 847 frequencies - which gives the link information to broad band the 847.
leighton. GW3FSP.
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Re: 60 Meter Transmit Mod Info Wanted
never mind, all is well
turns out that none of the instructions I have found included the?
3 finger salute reset? (hold FAST and LOCK while powering up)
all I found was the MENU #39 all init? ?reset
see you all on 60M FT8 !
de k9wkj
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Re: 60 Meter Transmit Mod Info Wanted
update?? but I just did the changes to one of my 847s started with one like this  and finished with it looking like this  I used 0 ohm resistors instead of a? solder bridge and i cant find that the changes did anything at all except causing me to have to reset all my settings and memories it gives "error" when going out of any band from 160M - 70cm I enabled the AK emergency channel? in the menu and it will TX there but it would have done that any way? anyone ever have success with this?
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Thanks, I was aware of that.? The current experimental band is 40.660 to 40.700 for US stations.??
At this stage I don't even have a license to transmit on 8 meter.
Tom? K6EU
On Mon, Feb 13, 2023 at 10:55 AM Spence M0STO via <unavailable.equal= [email protected]> wrote:
Hi Tom,? ? ? ? ? ? ? ?just a work of warning!! There is an fundamental at 36mhz. Be very weary about transmitting anywhere near that frequency.
?De Spence M0STO? Sent while portable! please excuse typos. On 13 Feb 2023, at 17:57, K6EU <wa4qvq@...> wrote:
? I've tried receiving 8M signals with my FT-847.? So far I decoded two stations on 40.680 Mhz using the 847 and an 80M wire.??
73,
Tom K6EU
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Hi Tom,? ? ? ? ? ? ? ?just a work of warning!! There is an fundamental at 36mhz. Be very weary about transmitting anywhere near that frequency.
?De Spence M0STO? Sent while portable! please excuse typos.
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On 13 Feb 2023, at 17:57, K6EU <wa4qvq@...> wrote:
? I've tried receiving 8M signals with my FT-847.? So far I decoded two stations on 40.680 Mhz using the 847 and an 80M wire.??
73,
Tom K6EU
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I've tried receiving 8M signals with my FT-847.? So far I decoded two stations on 40.680 Mhz using the 847 and an 80M wire.??
73,
Tom K6EU
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Has anyone tried using an 847 on the new experimental 8M band?? I've been monitoring 40.680 (FT8) for several?days without?success.? Given the time of year, this is no surprise?but, I wonder, how sensitive?the radio?is at 40Mhz.
Has anyone tried transmitting on 40 Mhz?? Does the wideband mod enable the radio to xmit on 8M?
You can contact me via the ARRL reflector.
73,
Tom? ?K6EU
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Looking for an 847 front panel (plastic)
If anyone is parting out an 847, looking for the front plastic panel.? Mine got cracked in shipping.
Thank you!
Kent K9EZ
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Re: FT-847 Won't Work in SAT Mode
All, ? So what I found out is the ALC modification that I implemented to use the 847 with transverter's disabled the SAT mode function.? I'm not sure why but removing the diode that was suggest by OK1VPZ and team fixed the issue.? ? '73, ? John N2HMM ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Spence M0STO via groups.io
Sent: Wednesday, January 25, 2023 5:24 PM
To: [email protected]
Subject: Re: [YaesuFT847] FT-847 Won't Work in SAT Mode? Could it be the Same band? Inhibit the loop back effect? De Spence M0STO? Sent while portable! please excuse typos.
On 25 Jan 2023, at 21:04, John N2HMM <n2hmm@...> wrote: ? Hello, ? I have an 847 that won't transmit while in SAT Mode.? The radio works fine in all modes, bands and powers at half-duplex and in split mode but when in SAT Mode, the radio won't transmit.? ? Any thoughts or ideas would be appreciated.? ? ? '73, ? John N2HMM ?
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Re: FT-847 Won't Work in SAT Mode
Could it be the Same band? Inhibit the loop back effect?
De Spence M0STO? Sent while portable! please excuse typos.
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On 25 Jan 2023, at 21:04, John N2HMM <n2hmm@...> wrote:
? Hello, ? I have an 847 that won't transmit while in SAT Mode.? The radio works fine in all modes, bands and powers at half-duplex and in split mode but when in SAT Mode, the radio won't transmit.? ? Any thoughts or ideas would be appreciated.? ? ? '73, ? John N2HMM ?
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FT-847 Won't Work in SAT Mode
Hello, ? I have an 847 that won't transmit while in SAT Mode.? The radio works fine in all modes, bands and powers at half-duplex and in split mode but when in SAT Mode, the radio won't transmit.? ? Any thoughts or ideas would be appreciated.? ? ? '73, ? John N2HMM ?
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Andy Bosworth
Andrew Lenton
Jeff M0UHF
gw3fsp
Spence G5STO