Service Manual - differences
For those technically inclined:
The available pdf service manual (technical supplement) is version 1.2.? There must be a version 1.0 or 1.1. My RF board layout (backside) does not match the manual (or the schematic). Specifically, C3018 has a three leaded device? (like a SOT-23) hooked to it (and it is shorted). It's not Q3004 - that is a four leaded device. There is no UHF reception and this is the reason why - signal is shorted to ground here.
thx,
Alan, W4FBI
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Leighton - ok thx, indeed.
Alan, W4FBI
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Hi alan, as far as Know it should be in ' backup ' this keeps the memory active for your settings.
Leighton. GW3FSP.
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Next to the 3.3v lithium battery is S1001 switch. Position is 'OFF" or 'Backup'
Can't find any info on it. What position should it be in for normal operation?
thx
Alan, W4FBI
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Re: Can FT-847 power 2 preamps with total current of 400mA
HI Bruce
quietly use two preamps through MENU 29 and 30 UHF-AMP and VHF-AMP power supply
The FT847 is not full duplex, so it will only feed one at a time and the current, at least with my LNAs, have had no problems.
There are also two things to know:
1 if you have an instrument or a PA after the radio, you risk that the power does not go through and short out before the instrument for its possible components on the line
2 when you activate the external one, the internal one can no longer be activated.
Personally, I preferred to feed separately after PA and pwr / swr METER, both because after the PA they cut off the power supply and in case of having 2 LNBs in series that can always be used, either one or the other or together, even if then it increases the NF considerably.
73
Franco
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FT847 QRP for TRANSVERTER
FT847 QRP or QRPp for TRANSVERTER HI I have to use a low power output, with no possibility of high power error, to drive an external transverter for 13 and 23cm or QO100 upconverter.
I would not always want to have the low power but have an extra output for the transverter and use its original PL/N output, still the maximum power of 50w to V & U and use a QRP/QRPp output for the transverter independently and securely?
?
Any advice on how this can be done on the FT847?
?
Thank you and greetings
73
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Re: Can FT-847 power 2 preamps with total current of 400mA
But does the 847 not supply the required voltage?? It is not from
the pre-amps.? The radio powers the pre-amps.
Grim? - ZL3TV
On 21-Oct-20 8:27 PM, Michael Luft
wrote:
Hello.
Sorry,
but I don't?understand?why you may be looking for
trouble?connecting the DC supply of the AR's LNA's to? the
FT-847.
I can tell you that after 6 months of working on a faulty FT
847, that it's an? old radio, not enough technical support and
a shortage of obsolete?spare parts.
Isn't
it simpler to use an?external power supply?
73
Mike
?4X1LM
??
I
just acquired a used FT-847 and plan to use it for VHF/UHF
work including getting into satellites. I have one question. I
plan to get preamps and am looking at 2M and 75cm mast preamps
from Advanced Receiver Research. They require 200mA each. The
Yaesu manual says it can supply 300mA to the VHF AND/OR UHF
connectors. I am confused if this a total for both connectors
conbined or 300 mA each? Looking at the schematic I see there
is one current limiter for both connectors so I assume this is
a total number. I am wondering if anyone has run into this?
Thanks,
Bruce, WB6IZG
|
Re: Can FT-847 power 2 preamps with total current of 400mA
Hello. Sorry, but I don't?understand?why you may be looking for trouble?connecting the DC supply of the AR's LNA's to? the FT-847.
I can tell you that after 6 months of working on a faulty FT 847, that it's an? old radio, not enough technical support and a shortage of obsolete?spare parts.
Isn't it simpler to use an?external power supply? 73 Mike ?4X1LM ??
I just acquired a used FT-847 and plan to use it for VHF/UHF work including getting into satellites. I have one question. I plan to get preamps and am looking at 2M and 75cm mast preamps from Advanced Receiver Research. They require 200mA each. The Yaesu manual says it can supply 300mA to the VHF AND/OR UHF connectors. I am confused if this a total for both connectors conbined or 300 mA each? Looking at the schematic I see there is one current limiter for both connectors so I assume this is a total number. I am wondering if anyone has run into this?
Thanks,
Bruce, WB6IZG
|
Re: Can FT-847 power 2 preamps with total current of 400mA
The preamps I was looking at were the 160 Watt thru power premaps (MSP144VDG-160 and MSP432VDG-160). These require 200mA each during RX.
After further investigation I thought the UHF port was broken since I could not measure 12V coming out. I had menu items 29 and 30 turned on. But after more investigation it turns out 12V only comes out when you are receiving?in that band as well. Therefore?I will not be powering both preamps at the same time. Way to go Yaesu. It looks like I am good.
Bruce, WB6IZG
On Tue, Oct 20, 2020 at 5:04 AM Douglas Richards < ve3ffr@...> wrote:
Morning Bruce
I just looked at the website
for Advanced Receiver Research, and they say all their
receivers require
25ma. Well within the
parameters for the 847.
Even the military receivers
were at 25ma.
Hope this helps.
Happy Hunting
Stay Safe
73
Douglas Richards VE3FFR
On 10/20/2020 1:04 AM, Bruce Forsberg
wrote:
I just acquired a used FT-847 and plan to use it for VHF/UHF work
including getting into satellites. I have one question. I plan to
get preamps and am looking at 2M and 75cm mast preamps from
Advanced Receiver Research. They require 200mA each. The Yaesu
manual says it can supply 300mA to the VHF AND/OR UHF connectors.
I am confused if this a total for both connectors conbined or 300
mA each? Looking at the schematic I see there is one current
limiter for both connectors so I assume this is a total number. I
am wondering if anyone has run into this?
Thanks,
Bruce, WB6IZG
--
73
Douglas Richards VE3FFR
ve3ffr@...
|
Re: Can FT-847 power 2 preamps with total current of 400mA
Morning Bruce
I just looked at the website
for Advanced Receiver Research, and they say all their
receivers require
25ma. Well within the
parameters for the 847.
Even the military receivers
were at 25ma.
Hope this helps.
Happy Hunting
Stay Safe
73
Douglas Richards VE3FFR
On 10/20/2020 1:04 AM, Bruce Forsberg
wrote:
I just acquired a used FT-847 and plan to use it for VHF/UHF work
including getting into satellites. I have one question. I plan to
get preamps and am looking at 2M and 75cm mast preamps from
Advanced Receiver Research. They require 200mA each. The Yaesu
manual says it can supply 300mA to the VHF AND/OR UHF connectors.
I am confused if this a total for both connectors conbined or 300
mA each? Looking at the schematic I see there is one current
limiter for both connectors so I assume this is a total number. I
am wondering if anyone has run into this?
Thanks,
Bruce, WB6IZG
--
73
Douglas Richards VE3FFR
ve3ffr@...
|
Can FT-847 power 2 preamps with total current of 400mA
I just acquired a used FT-847 and plan to use it for VHF/UHF work including getting into satellites. I have one question. I plan to get preamps and am looking at 2M and 75cm mast preamps from Advanced Receiver Research. They require 200mA each. The Yaesu manual says it can supply 300mA to the VHF AND/OR UHF connectors. I am confused if this a total for both connectors conbined or 300 mA each? Looking at the schematic I see there is one current limiter for both connectors so I assume this is a total number. I am wondering if anyone has run into this?
Thanks,
Bruce, WB6IZG
|
Re: FT847 direct TX after turning on TRX ( Not MOX )
Does it matter which mode the rig is in?
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Re: Wanted ft847 pcb with microprocessor
Talk to Geoff at Castle Electronics. I think he can replace the cpu on your board.
/Nils SM7DVO
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FT847 direct TX after turning on TRX ( Not MOX )
Hi FT847 users
I have a question:
?
I have a FT847 that will transmit immediately when I turn ON the TRX not always but nearly always
Now and then the TRX works fine for some time , then suddenly starts to transmit on its own
?
Some info:
?
MOX knob is NOT the cause
Nothing is connected, no microphone, only the antenna and power cable , so no external cause
No short inside the 8P Microphone connector
?
Did anyone see this problem before ?
please let me know here in the FT847 Group or DIRECT via?pa3dol@...
?
Many thanks in advance
?
Best 73
Sjoerd
PA3DOL
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Re: Wanted ft847 pcb with microprocessor
Hi Leighton,
No I haven't changed the battery as the frequency and other settings on the radio do hold after restart. Its the internal microprocessor values that doesn't hold where you enter into the hidden menu. It works while I keep the radio on but resets to 0F on restart. I somewhere read the microprocessor values are not stored using battery also the values cannot be reset to factory values . Each time I have to enter the values for each item bit bad or keep the Radio on without turning the power off.
73's
Glit M0HPF
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Re: Wanted ft847 pcb with microprocessor
Hi Gilt, one question - have you replaced the internal coin cell battery ?.
Leighton. GW3FSP.
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Wanted ft847 pcb with microprocessor
I have a fantastic rig but the microprocessor is not working well means cant hold the settings and cannot return to factory settings all values are reset after power off and switched on later.
wonder anyone has a broken rig where the pcb containing working microprocessor is available. I really wanted to get this rig u and running.
Please let me know if anyone has a spare PCB.
73’蝉
Glit
M0HPF
glitsun@...
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Re: 5 pin mini DIN plug FS
I looked at Mouser.com and
DigiKey.com both. They had them.
73
On 9/21/2020 9:28 AM, Franco wrote:
I bought 10 on ebay and paid all 10 pieces together for only
$ 5 and shipping included: they were fine.
On Ebay you can find them at very low prices!
Just search MINI DIN 5 via google or via ebay and obviously
check the photo of the pinouts before buying them.
73
--
73
Douglas Richards VE3FFR
ve3ffr@...
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Re: 5 pin mini DIN plug FS
I bought 10 on ebay and paid all 10 pieces together for only $ 5 and shipping included: they were fine.
On Ebay you can find them at very low prices!
Just search MINI DIN via google or via ebay and obviously check the photo of the pinouts before buying them.
73
|
Yaesu uses a 5 pin mini DIN plug on the FT-847. This plug is used as a connector for a cable to key a linear amplifier. Actually they use the same connector for HF, VHF, and UHF amps.
I had a very hard time finding a connector that fit. Some (I assume from China) did not fit right. I found some that DO fit fine. I assume they are American, or possibly Japanese. In any case, they do fit OK.
In order to get any kind of a decent price I needed to buy ten. I need one to use on the rig, and want to keep one spare. That leaves eight available, for sale.
They are $5 each (yes, I will end up making about a 16 cent profit!), plus shipping. I can ship one, two, or three via first class mail for $4.60.
It is quite possible that these 5 pin mini DINs are used on other rigs beside the FT-847.
Please let me know how many you want.
Thanks.
73,
Ken, W8EK
Ken Simpson
E-mail to W8EK@... or W8EK@...
Voice Phone (352) 732-8400
.
.
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W4FBI
gw3fsp
Frank
Nils Ostman