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Ok. If I not could explane quite well. So, measurements/stetps from connections are same on VFO and CPU torstai 28. tammikuuta 2021 Mat Breton <i.m.n8tw@...> kirjoitti:

When I get time I'll dig into the schematics again. We are missing something I think ... -- -Mat Breton, N8TW

Sorry! Measuring the voltage changes when spin the VFO dial, steps J01(P06) From pin C164, C165 ... 1khz, 2khz, 4khz, 8khz, 10khz, 40khz, 60khz, 80khz, 100khz. Same lsb and usb on 3.7Mhz. No hz

All, If I was a betting man (and I've been known to wager a bit here and there) I'd place money on the problem being with Q27, a uPD8255AC-5 programmable I/O controller. This takes muxed CPU data and

Very good, we are making progress I think. It *appears* that the CPU commands are not reaching the VFO PLL. Since the CPU separately drives the VFD display, this would explain all the symptoms you are

Measuring the voltage changes when spin the VFO dial, steps J01(P06) From pin C164, C165 ... 1khz, 2khz, 4khz, 8khz, 10khz, 40khz, 60khz, 80khz, 100khz. Same lsb and usb on 3.7Mhz. No hz changes, only

OK, I have an idea. But first a few basics: 1. The VFO frequency is driven by a microcontroller controlled PLL into the 1st mixer. The scheme is pretty complex and is shown on page 49 of the tech

Tnx for reply. No others, only those two. Btw. I have Ft-980 Technical Supplement and I have measured values on the vco/pll and vfo units. BUT. Don't know where to start. In how many places the

Hi Aimo, Nothing comes to mind (LDB shouldn't cause this for example). I haven't seen this on my rig ... Q: Are there any other LEDs lit except 1. VFO (above the display) 2. Ham (above the Ham

Hello, in my FT-980:? when rotating vfo knop, in the display numbers are changin by 10 hz,thats ok, but the real frequency is not changin until one khz is reached. So, by one khz steps. I have

Fred, Most 980 users looked at the Yaesu and Yaesu pulled that mod. Not sure what K4DPK did but it caused problems on CW and FSK TX. He is a SSB guy. Not sure of the later mod as the GEN TX I want

I currently have four FT-980s plus about half of another in parts. It's my favorite rig, and I've owned a LOT of various models of gear over the years. The solution to the linear problem comes in the

Dave, Which "Yaesu Gen TX Mod" are you referring to - the one they published early on, or the kit they offered (which included a buffer board)? What is the caution against using either? 73 - Fred,

Mat, Maybe only for USA I know many were sold in JA for their 10 watt rig. K7JA then at Yaesu sent me the 10 amp board which I used once and sent back replacing it with my 100 amp board. I also

I've seen two other FT-980 for sale in person: one was at Dayton, and another at Findlay. Only 600 made (I assume for US market)? I maybe should have bought another one! -- -Mat Breton, N8TW

I tried the ft-980 io group and my group came up without the need to sign in. I clicked on the files and got them all. Here are a few things about the FT-980 a user needs to be aware of... 1.

Thanks Roger and Wald. My original FT-980 was purchased in 1983. I bought a used 980 from K4DPK who modified it for GEN TX which I used the memories for those 60 meter channels. My next two were

Hi Dave, Go to /g/Yaesu-FT-980 sign in with your groups.io credentials. In the left pane click on the Files section near the bottom. 73 Roger VE7LB

Roger, How do I get to the files section? 73 Dave K4JRB

I had to do this with my Henry linear, but I used an external relay box (and used a "solid-state" relay to minimize noise/maximize life, switch faster). Unfortunately can attest that if you don't do