开云体育

to N9IB Thanks a lot, so the battery holder has the positive in the solid one. Like a battery. The (my) "female" in the radio plug has a RED line. showing that that is positive and therefore there

I just looked at my battery holder for the two AA batteries in my FT-980.? Mine is slightly deformed due to what looks like extra strong springs but luckily for me no damage from battery leakage.?

The 2 battery case of my FT-980 was destroyed 20 years ago by a mix of strong springs, low quality plastic and maybe some acid from bateries. I was silly enought not to note the polarity I glued a

Final, radio working OK. Puts out 100W. Lesson learned. Anyway the broken capacitor was larger, 25V instead of 16V and different color otherwise 10uF like the others. From factory from sure. I guess

I have cut C18 positive leg in Q01 collector. Leaving some mm of it to be able to solder new capacitor. Negative is surface soldered, large area. Removed capacitor show 14.5 Ohm in both senses. No

New advances. I lifted (cut) from T13.5V the choque L05 feeding predriver, and TX13.5V intensity went down to 250mA. In this line only transistor Q01 or capacitor C18 can produce the short. I guess

Today a went to a friend that has a lab PS and as expected it showed a short cutting in regulated 0,5A, obvious too much for the bias line, even with the predriver taking from TX13.5V. All was tested

Involved with the PA, I see it is very difficult to access/repair. And maybe expensive if transistors are damaged by overvoltage. The Manual tells you to keep an eye on the 24V because overvoltage

You say only receives "on 80 and 20 meters". With a 9MHz filter that would be tipical? problem in a convencional radio using 5-5.5MHz VFO. But I have not gotten into the frequency mix of this

By that I mean that in those bands I get background noise (static) but do not receive signals that my other radio can receive with no trouble.? The display seems to work fine.? Happens in both GEN

Hallo N9IB Speaker noises in Tx hidden in my long speech. I make it short. If 13.5V is "killed" "protected"? to 3/4V due to PA problems, the radio makes funny speaker noises in TX as you report. So

Hallo N9IB Regarding the no reception, I have not clear the situation. Does it show frecuencies in display? How in GEN?. Only in HAM?. There can be some things. if it is only in Ham. I would first

Thanks for the updates on your progress.? I have a new-to-me FT-980 that only receives on 80 and 20 meters.? It also has a loud squeal when attempting to transmit.? Please continue the updates, I

Today I have seen a video of a FT-980 PA repair with the Q01 mod, taking collector voltage from the TX13.5V. So it seems to be factory made. In my rig the lacker on the screws seemed original. So I

Continuing the story I am still looking inside the PA. This rig was bought in 1987 from a store when it closed, and might have had a previous owner. Today I found a modification not documented

Thanks Mat Breton N8TW. Sorry for the noise in this topic on overdrive. I think I will continue on a new topic on this 73 EA1FC (not familiar at all with transistors)

Mat, I get the overdrive on my ft-980 on occasion. I usually cut back on the processor. 73 Dave K4JRB

Dry tantalum (and Niobium-Oxide) are typically more stable than wet electrolytics when left uncharged. Field failures can often be traced as secondary failures caused by a primary failure elsewhere

Just for what it is worth. I am today involved with ( series 040XXX) PA. All capacitors and in (fan) control unit attached to it are tantalum. As I said in a former post the TX13.5V from RF unit to PA

FT-980 no power out in HAM mode After? many years iddle I switched on the FT-980 and it did not transmit. To make a long story shorter, the transmissión is inhibited if a trasverter is used or in