Hello.?

?I have a faulty FT 847 serial number 6G070383. The problem is Q1105? CPU of the AF-CNTL board doesn't get is 5 supply.
According to the the service manual, this voltage comes for 5 volts regulator Q1134, LM8705ua chip.
Unfortunately I? cant find this chip and all the relevant components on both sides of the board, so I cant trace the fault.
So please, if someone has any info about this, please let me know.
73
Michael
4X1LM

thats a good idea Mike??
almost cheating??
but it wont work currently as the CAT circuit is poofed on my rig
no life on the lines at all??
I have the MAX232 chip and the muxer chip on hand, for when the day comes and 6M isnt open??
??
and after more thought??
that is a excellent solution, as I very seldom move off of my TX freq of favor??
and even when doing voice on 2 and 6 that wont really bother??
so till I find a filter I am in business

On Fri, Jul 10, 2020 at 09:01 PM, k9wkj wrote:

My 847 has a 2100 or 2300 Hz Inrad filter
and want to find a stocker or even wider??
the narrow filter is not the best when bangin away on 6M FT8 and the like??
I know Inrad sold a 2800Hz filter, but even if it was still available I wont be paying $180 for it
if anyone has a stocker? and someone need the narrow in mine?

de k9wkj

There are two SSB filters...? One TX and one RX (owner's manual page 95).? Are both of yours narrow?? If not, you could try swapping them.? Using SPLIT or FAKE SPLIT in FT8 should keep your TX signal inside the filter passband on transmit.

73, Mike - W1MI

My 847 has a 2100 or 2300 Hz Inrad filter
and want to find a stocker or even wider??
the narrow filter is not the best when bangin away on 6M FT8 and the like??
I know Inrad sold a 2800Hz filter, but even if it was still available I wont be paying $180 for it
if anyone has a stocker? and someone need the narrow in mine?

de k9wkj

Hi all,
Anyone know if the board is still available for the mod adding the roofing filter to this radio? I’ve checked on the InRad site and the filter’s still there but not the board...
The experimenters boards all show as out of stock too. If anyone has a board sitting around..?
Cheers,
Andy M0DEL?

In message <[email protected]>, Andy M0DEL <amlindley@...> writes

Hi Brian,
I don't work 70MHz (yet!) but my ft847 stopped working on 7MHz. No TX
or RX. A bit of digging later and I traced it to D3053 in the bpf.
Replaced the pair in bpf 4 and it’s working a treat again. Many more
years of life in the old box... Good luck with yours!
73 de Andy M0DEL?

Thanks

I'll have look at the 21MHz equivalent BPF7. I'm surprised a fault there stopped the TX from working. I ordered schotty equivalents to do the improvement mod, but I've not got round to it.



I had it apart yesterday to fit a battery holder for the CMOS memory.

73 Brian GM4DIJ
--
Brian Howie

Hi Brian,
I don't work 70MHz (yet!) but my ft847 stopped working on 7MHz. No TX or RX. A bit of digging later and I traced it to D3053 in the bpf. Replaced the pair in bpf 4 and it’s working a treat again. Many more years of life in the old box... Good luck with yours!
73 de Andy M0DEL?

Thanks Brian -top tip!

Hope to see you again on 70MHz soon
Steve, M0BPQ

In message <[email protected]>, Steve Bunting M0BPQ <steve@...> writes

Hi everyone,

I have owned my FT847 for a very long time, maybe 20 years. It is a UK
version that has usually worked on 70Mhz, but has stopped putting any
power out recently. The radio goes into TX on 4m, but does not put any
power out (measured on a Bird meter so there may be mW.). The radio has
the L5006 mod from? worked fine for
10 years or more.

The radio works fine on 50MHz so I know the PA stages are not kaput. I
have done a factory reset several times and do not know what to look at
next. Can anyone give me any clues?

Thanks
Steve, M0BPQ

I assume it works on Rx.

Someone posted a decent set of schematics recently. On page 6/7 you can see a section where the HF path splits to 3 different filters . One section is 54 to 76MHz. See if the signal is getting through that. Check the two steering diodes 3015 and 3031 and if the control voltage is functioning at the junction of R3041 and R3046.

I've studied the circuits at great length as I'm trying to find out why mine isn't working on 21MHz ( works everywhere else) . I think mine is that the relevant band pass filter in the PA isn't switching in as it doesn't work on RX either. Sometime I'll get round to debugging it.

Good luck

Brian GM4DIJ
--
Brian Howie

You can repair the encoder: open up the? four retaining lugs on the encoder? which will allow you inside, you can then clean and re-tension the

I looked on ebay already.? nothing there right now.? I will check back now and then and see if something shows up.? Thanks

Hi everyone,

I have owned my FT847 for a very long time, maybe 20 years. It is a UK version that has usually worked on 70Mhz, but has stopped putting any power out recently. The radio goes into TX on 4m, but does not put any power out (measured on a Bird meter so there may be mW.). The radio has the L5006 mod from??and worked fine for 10 years or more.

The radio works fine on 50MHz so I know the PA stages are not kaput. I have done a factory reset several times and do not know what to look at next. Can anyone give me any clues?

Thanks
Steve, M0BPQ

开云体育

I believe you buy them on EBay. ?I bought a sub tune encoder for my 847 there a year ago....... ?

So I sold my FT-847 to help fund a IC-9700.? The ham who purchased it wanted to return it because he said the AM on the low bands had no carrier when the radio was keyed.? So I took it back as I was trying to be a nice guy and refunded his money.? Radio came back and the SUB TUNE knob was broken off and the face plate cracked.? Repaired the face plate (cant even tell that it was broken) and fixed the encoded shaft but the encoded internally is damaged.? Any one know where to get a replacement SUB TUNE encoder or do I now have to scrap it for parts??? Thanks,? Will - N7IPY

开云体育

I use the RT Systems programming cable (Windows 10) which also works for CAT control using SatPC32. You have to set Menu #37 to 9600 bps for SatPC32 to work. You have to reset Menu #37 to 19200bps ( I think it was) for the programming software to work. For rotor control (Az only) I use PST Rotator on an old XP computer.
73 Dennis VE3XC

开云体育

Who is using CAT CONTROL and what is the best software for controlling the FT-847? I am about to delve into CAT CONTROL of my FT-847...I have had this rig for many years but never have pursued SOFTWARE to control it.
Thus, I am wide open to what the best way to go is. HELP appreciated. Rather than just use a standard Null? SERIAL Cable, I did order the RT Systems cable.

GARY
W7FSI