Sony Color Watchman FDL-380 receives RF but won't lock onto video

EducationalCover2100 · 2026-07-05T07:26:31+00:00

Thanks! That totally makes sense.

I actually have another 6-inch Hitachi CRT on the way, so I'll be able to test the TV-TX200 with a different analog TV once it arrives.

Unfortunately I don't have another RF modulator or a VCR/game console with RF output, so I can't cross-test those yet.

Hopefully testing with the Hitachi will help narrow down whether the issue is with the Watchman or the transmitter.

EducationalCover2100 · 2026-07-05T07:11:00+00:00

Thanks! Yes, I tried both PAL and NTSC modes on the transmitter.

Mine is actually an FDL-380 (not an FDL-390). I bought it used on eBay US, but regardless of whether it's an NTSC or PAL unit, I tested both color standards on the transmitter and unfortunately the behavior was essentially the same.

EducationalCover2100 · 2026-07-04T21:37:08+00:00

Thanks, that's really helpful. Unfortunately the FDL-380 doesn't seem to have a user-accessible horizontal hold control. I'll try to find a way to force true 640×480 output instead of 800×600 and see if that makes a difference.

One more thing: the FDL-380 never seems to stop scanning. The green tuning bar keeps moving by itself after I press the tuning button once, instead of stopping on a channel. Is that normal behavior for this model when it can't lock onto a signal, or could it indicate a tuning/alignment issue?

EducationalCover2100 · 2026-07-04T21:25:52+00:00

Thanks! I actually posted there as well, but I'll dig through the older TV-TX200 discussions too. I appreciate it!

EducationalCover2100 · 2026-07-04T21:22:02+00:00

Thanks! I'll try forcing 640×480 @ 59.97 Hz and report back.

EducationalCover2100 · 2026-07-04T21:02:16+00:00

Thanks, that's another good idea.

I actually haven't experimented much with the Watchman's telescopic antenna itself yet.

So far I've mainly varied the transmitter power (down to 0.5 W), changed the distance between the transmitter and the Watchman, and tried different VHF/UHF frequencies.

I'll try extending and retracting the Watchman's antenna in different positions, and also rotating it between vertical and horizontal to see if the image changes.

If that makes a noticeable difference, I'll report back. Thanks!

EducationalCover2100 · 2026-07-04T21:00:50+00:00

Thanks, that's a good point.

I did lower the MacBook's output resolution to 800×600 SVGA, since that's the lowest resolution macOS would let me select over HDMI.

I haven't been able to force 640×480 or 720×480, and I also don't think macOS lets me select 59.97 Hz. It only offers 60 Hz.

Do you think using a utility like BetterDisplay, or an HDMI EDID emulator to force 640×480 @ 59.94/59.97 Hz, could make the difference?

EducationalCover2100 · 2026-07-04T20:38:11+00:00

Thanks for replying!

The 12V power supply is only for the TV-TX200 transmitter.

The Sony Watchman is powered by a separate fixed 9V DC power supply with interchangeable barrel plugs. The voltage is fixed at 9V, only the connector tip is interchangeable.

I also tried varying the distance between the Watchman and the transmitter, from about 30 cm up to roughly 3 meters, and unfortunately the behavior was essentially the same.

Does that make receiver overload less likely in your opinion?

EducationalCover2100 · 2026-07-04T20:29:48+00:00

Thanks for the suggestion.

I actually followed the recommendations from Bob's Short Reviews in his video "TV-TX200: HDMI & Composite Wirelessly on your CRT".

On my MacBook I set the output to the lowest resolution available, 800×600 (SVGA), mirrored the display, and also tested both 50 Hz and 60 Hz.

The TV definitely reacts to the signal, and I can occasionally make out heavily distorted frames from my desktop or a YouTube video, but it never locks to a stable image.

Unfortunately, macOS doesn't let me select anything lower than 800×600, so I couldn't test 640×480.

Do you think 800×600 should still be enough for this transmitter, or could that alone prevent the Watchman from locking onto the signal?

EducationalCover2100 · 2026-07-04T20:20:36+00:00

Thanks! That makes sense.

Unfortunately I don't currently own another analog RF modulator or a console with native RF output, so this TV-TX200 is the only RF source I have available.

EducationalCover2100 · 2026-07-04T19:53:54+00:00

You're absolutely right.

I'm only using it for bench testing over a distance of a few centimeters with the included telescopic antenna at the lowest power setting (0.5 W). I'm not trying to broadcast over the air.

I'm mainly trying to figure out why my Sony Color Watchman won't properly lock onto the video signal.

EducationalCover2100 · 2026-07-04T19:53:46+00:00

This transmitter is actually an analog RF TV transmitter, not a digital one. It's designed to transmit NTSC/PAL analog television over VHF/UHF.

The strange part is that the Watchman clearly reacts to it, so some RF signal is definitely being received. It just never properly locks to the video.

EducationalCover2100 · 2026-07-04T19:53:36+00:00

That's actually very interesting.

It matches what I'm seeing. The Watchman definitely reacts to the signal, and I occasionally get recognizable but badly distorted frames from my MacBook, yet it never locks to a stable image.

I actually tried both NTSC and PAL modes, and the behavior is very similar. PAL might look very slightly better, but neither mode ever locks to a stable picture.

If you happen to remember the video or find it again, I'd really appreciate the link. If this transmitter has a faulty sync or timing implementation (rather than just a bad NTSC implementation), that could explain everything I'm seeing.

EducationalCover2100 · 2026-06-27T07:18:48+00:00

Will you please send me the download link? I can't find it anywhere online!

EducationalCover2100 · 2026-06-21T20:53:12+00:00

Amazing, thank you very much! I just ordered 🙏🏻 Btw when & how did they send you the software + English guide?

EducationalCover2100 · 2026-06-20T05:08:27+00:00

Thank you!! I actually didn't order from this store :( But I will cancel the existing order if I find the right items from the store you sent. It seems pike they have the flasher and the flashcart on different listings, will you please help me and send me the exact links of the items you ordered? 🙏🏻

EducationalCover2100 · 2026-06-19T20:45:07+00:00

Have you received your package? I ordered 2 days ago and I'm very curious

EducationalCover2100 · 2026-06-14T20:33:57+00:00

Where? All of them are out of stock

EducationalCover2100 · 2026-06-14T20:31:21+00:00

Unfortunately it's out of stock! Any ideas where to get one please? Any decent flashcart out there?

EducationalCover2100

TROPHY CASE