Hi, I have an FT-847 that appears to have no TX or RX on any band or mode, but it transmits at much less than a watt. When I put an antenna on it, I could hear myself very low on another radio in my shack. Likewise, when I transmitted with the other radio, I could hear myself on the FT-847, but very low. Any suggestions on what could be wrong?

On 7 Apr 2025, at 07:45, 2191E NP4ET via groups.io <etantennas@...> wrote:

Yes, on all bands

Hi, I have an FT-847 that appears to have no TX or RX on any band or mode, but it transmits at much less than a watt. When I put an antenna on it, I could hear myself very low on another radio in my shack. Likewise, when I transmitted with the other radio, I could hear myself on the FT-847, but very low. Any suggestions on what could be wrong?

On 7 Apr 2025, at 07:53, M0CNL via groups.io <m1cxz.m0cnl@...> wrote:

?

Is it all modes as well?

---

From: [email protected] <[email protected]> on behalf of 2191E NP4ET via groups.io <etantennas@...>
Sent: Monday, April 7, 2025 7:45:15 AM
To: [email protected] <[email protected]>
Subject: Re: [YaesuFT847] Excessively low reception and transmission

?

Yes, on all bands

One of my buddies is selling his 847, but it's one of the unidirectional models. Will I still be able to take advantage of doppler tracking and digital modes with it? Or do either of these require bi-directional CAT control? I'm not too pressed about seeing the frequency on the screen, just about it actually controlling the radio. Needless to say I've been spoiled with USB CAT control with my 7300 for some time now.

On 18 Feb 2025, at 16:42, Spence G5STO via groups.io <unavailable.equal@...> wrote:

?

The FT847 has the same 8 pin connections for other tuners. FC10, FC20, FC30 and others. This is important for band switching.

I have all three tuners and tested them all and they all work well. ?

? Other tuners don’t have band switching or inhibit so effectively transmitting into a high SWR while the servos do their thing unless it’s a purely relay ATU (CG3000, SGC SG230 and some LDG tuners). When it comes to the FC20 the steppers initially tune variable capacitors and switch in inductance. ?The FC10 is similar but the FC30 is more relay based. I like to think the FC20 as hybrid.?

? When you switch bands with the FC20 you see “wait” come up on the LCD while the capacitors tune. Again FC10 but from memory the “wait” only appears for a few seconds of at all on the FC30. These tuners are generally aesthetically similar to the radio they are designed for eg: shape, size etc.

? I’m not sure about the FC40 as I never owned one but if it’s got a 8 pin tuner socket then I’m sure it would work.

? If you consider the FC10, FC20 and FC30 all tune on the SWR and all receive the tune start and stop sequence in cooperation with the radio. They inhibit the transmit. The only difference between the FT847 and FT897 is the label is “sense” and the other label is “Band C” meaning change.

? This is just my observations and the fact I’ve owned or own the equipment.

? Hope it helps,

De Spence G5STO

??

Sent while portable! please excuse typos.

On 18 Feb 2025, at 15:42, Jeff M0UHF via groups.io <jeff.elliott45@...> wrote:

? Cheers thanks for your reply. I expected this anyway I thought it should work but it’s just that for some reason most of these units do not list the 847 yet it has the same connection as the other AC radios which I thought was bizarre strange?

Sent from Jeff M0UHF?

On 18 Feb 2025, at 15:40, Sandor Wetsel via groups.io <kg4fet@...> wrote:

?

EVERY Auto AT with a semi automatic mode will work with any radio. Just send a carrier and they will tune.?
Sandor KG4FET

On Tue, Feb 18, 2025, 8:20?AM vstockma@... via <vstockma=[email protected]> wrote:

There are 2 tuners that work with this radio. The FC-20 and the YT847. The YT847 is better in that it allows a PC connection for CAT control AND tuner funtionality. If you install the FC20, you will loose the ability to control the radio via CAT. Wither of these appear on or ebail, but you have to be patient.

I see that one is currently listed on Swap.

Thanks

Victor?

W4VAS

On 18 Feb 2025, at 16:42, Spence G5STO via groups.io <unavailable.equal@...> wrote:

?

The FT847 has the same 8 pin connections for other tuners. FC10, FC20, FC30 and others. This is important for band switching.

I have all three tuners and tested them all and they all work well. ?

? Other tuners don’t have band switching or inhibit so effectively transmitting into a high SWR while the servos do their thing unless it’s a purely relay ATU (CG3000, SGC SG230 and some LDG tuners). When it comes to the FC20 the steppers initially tune variable capacitors and switch in inductance. ?The FC10 is similar but the FC30 is more relay based. I like to think the FC20 as hybrid.?

? When you switch bands with the FC20 you see “wait” come up on the LCD while the capacitors tune. Again FC10 but from memory the “wait” only appears for a few seconds of at all on the FC30. These tuners are generally aesthetically similar to the radio they are designed for eg: shape, size etc.

? I’m not sure about the FC40 as I never owned one but if it’s got a 8 pin tuner socket then I’m sure it would work.

? If you consider the FC10, FC20 and FC30 all tune on the SWR and all receive the tune start and stop sequence in cooperation with the radio. They inhibit the transmit. The only difference between the FT847 and FT897 is the label is “sense” and the other label is “Band C” meaning change.

? This is just my observations and the fact I’ve owned or own the equipment.

? Hope it helps,

De Spence G5STO

??

Sent while portable! please excuse typos.

On 18 Feb 2025, at 15:42, Jeff M0UHF via groups.io <jeff.elliott45@...> wrote:

? Cheers thanks for your reply. I expected this anyway I thought it should work but it’s just that for some reason most of these units do not list the 847 yet it has the same connection as the other AC radios which I thought was bizarre strange?

Sent from Jeff M0UHF?

On 18 Feb 2025, at 15:40, Sandor Wetsel via groups.io <kg4fet@...> wrote:

?

EVERY Auto AT with a semi automatic mode will work with any radio. Just send a carrier and they will tune.?
Sandor KG4FET

On Tue, Feb 18, 2025, 8:20?AM vstockma@... via <vstockma=[email protected]> wrote:

There are 2 tuners that work with this radio. The FC-20 and the YT847. The YT847 is better in that it allows a PC connection for CAT control AND tuner funtionality. If you install the FC20, you will loose the ability to control the radio via CAT. Wither of these appear on or ebail, but you have to be patient.

I see that one is currently listed on Swap.

Thanks

Victor?

W4VAS