Yaesu FT-991 Frequency Expansion MARS / CAP modification

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Short video on how the modification is performed to expand the HF frequency transmit range on the Yaesu FT991. For educational purposes only - do not use radio equipment outside of its type acceptance or operate on a frequency you are not licensed for or authorized to use.
#survivalcomms

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10 май 2023

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Комментарии : 41

@rickmaudlin2160 Год назад

Thanks Brett for a great and instructive video as usual, and for taking the time to provide this information.

@survivalcomms Год назад

You are welcome ! Thanks for watching !

@SteveH-TN 4 месяца назад

Appreciate you sharing this video , as MARS/ CAP member, just ordered a FT-991a de AA4SH

@survivalcomms 4 месяца назад

Thanks for watching !

@isellfoodstampz 6 месяцев назад

I took a 991a apart to solder in a new clarifier knob. I undid that big ribbon cable and plugged it back in after much struggle. It was unbelieveably difficult. The radio would not power up anymore. I sent it back to Yaesu for repair. So yeah leave the big ribbon cable alone. Clarifier knob repair was successful :)

@survivalcomms 6 месяцев назад

Some ribbon cables are worse than others as you found out. Glad you got it up and running . Thanks for watching !

@Pacman163 Месяц назад

My mod was working till I just did a firmware update and now it won't work not even after holding fast and lock while powering on. I think the June 3-2024 firmware did something

@mechpilot5861 4 месяца назад

Works like a charm!

@survivalcomms 4 месяца назад

Cool beans ! Thanks for watching !

@mechpilot5861 4 месяца назад

Just got my FT-991a today, made this mod in 5 minutes, and everything is perfectly working now! Only need to do SWR adjustment to the new antenna.. :D Good to be electronics designer, so easy mod to do!

@survivalcomms 4 месяца назад

@@mechpilot5861 Yes the hardest part is taking the screws out :)

@mechpilot5861 4 месяца назад

@@survivalcomms So true :D

@remarkable_ruin8608 2 месяца назад

Anyone know how to extend the uhf range?

@CliffFoxKU4GW 11 месяцев назад

Will the ATU operate on any of the expanded transmit frequencies, like on 60 meter frequencies? "Very 73 de KU4GW, Cliff"

@survivalcomms 11 месяцев назад

It will however the tuner in this unit is pretty limited. Thanks for watching !

@frankieaufhauser3023 Год назад

thank you. what are the other jumpers good for ?

@survivalcomms Год назад

You are welcome. I'm not sure as to the purposes of the other jumpers. Thanks for watching.

@NickFrom1228 Год назад

Your camera was a tad out of focus when doing the jumper. But otherwise sufficient. I have a 991A that I plan to do this to. Thanks.

@survivalcomms Год назад

Thanks for watching !

@bigchew3149 Год назад

I Really want/Need to know how to mars mod the VHF/UHF n my 991

@survivalcomms Год назад

Unfortunately it isnt going to happen from my research. If you find out how to do so please let me know. Thanks for watching !

@hypnosiscenternyc 2 месяца назад

Will a base 991a transmit on a gmrs repeater frequency? Thanks

@survivalcomms 2 месяца назад

No Thanks for watching !

@MikeSmithKF7LVH Год назад

Is there no mod for the VHF/UHF bands ?

@survivalcomms Год назад

Not that I have found. If you find one let me know. Thanks for watching !

@j.m.5735 10 месяцев назад

Not a permanent mod, however tuning to the frequency you wish to TX and setting up your power and all your settings, you can turn the unit off - press and hold A=B A/B and FAST while turning the unit on. DO NOT use the Clarifying knob while in this mode as you will change how the radio operator internally. Now that you are in this system configuration mode, make sure your in setting 1, smash the band switch button until you find the band you tuned up. Viola your TX unlocked. Unfortunately you have to do this every time you change frequencies. PS make sure you turn it off before messing with any knobs. No known permanent mod as of yet. 73

@survivalcomms 10 месяцев назад

@@j.m.5735 I have seen that done but never tried it personally. I sold this radio soon after I made this video so I don't have the chance to test it myself. I know from experience on other radios however that one has to be very careful in these hidden menus. Its easy to misalign a radio in a service menu. Thank you for sharing and thank you for watching !

@amlo2266 11 дней назад

@@j.m.5735I thought it was up down up down left right left right THEN a b a b start?

@dirtysquatch7036 7 месяцев назад

Does this mod open up tx on 11 meter?

@survivalcomms 7 месяцев назад

It does. Thanks for watching !

@dirtysquatch7036 6 месяцев назад

Its hard to tell but it looks like your pointing at the first jumper on the bottom?

@paulkazjack 10 месяцев назад

I reckon those other jumpers are worth soldering. This may onlock vhf and UHF frequencies. Worth a try.

@survivalcomms 10 месяцев назад

I'm confident someone has tried that before and found it just changed it to a Japan config etc. I sold the radio soon after making this video. Performance of these multiband HF rigs out of band more than a few mhz on VHF / UHF has been pretty poor in my experience. An el cheapo FM rig out of the box however pretty much only suffers at the extreme band edges if at all. Thanks for watching !

@newsmickey5272 5 дней назад

The jumper that's way out of focus, right LOL 😜

@survivalcomms 5 дней назад

Thanks for watching !

@socalfishing3121 19 часов назад

I was really thinking about getting into ham radio but after listening to the 40 meter band at my friends house and how rude everyone was on that band I don't think I am going to take the general test anymore I mean come on man just a bunch of men carrying on and on about nothing and wont let any one else break in or talk guess not

@survivalcomms 16 часов назад

I understand the sentiment. I would tell you not to let a bad experience make up your mind for you. The access to spectrum is worth it in my opinion. Thanks for watching !

@reinersteinweger3874 5 месяцев назад

Das so ein Geheimnisse gemacht wird wegen der UKW Modifikation ...kenne viele Om's die diese Marke nicht mehr kaufen....

@survivalcomms 5 месяцев назад

Ich habe es vor einiger Zeit verkauft. Ich mochte das Radio nicht. Ich habe kommerzielle Funkgeräte, die ich im LMR-Spektrum verwenden kann. Danke fürs Zuschauen!