NB is your noise blanker. It is a very simple but effective circuit that gates electrical impulses to ground at the receivers front-end. It is effective against amplitude impulses like electric fence's, car ignitions and to some extent, lightning and static crashes. These types of interference generally do not affect FM reception which is why the Noise Blanker is not active when FM is chosen. Further, gateing an FM signal to remove amplitude impulses could actually make them more evident at the speaker.
You really need to do your research before you make a video like this. You say that you can buy a radio for 100 euros that does the same as this radio, this is so far from the truth. You use that radio as a standard fm repeater rig. That’s not what it was built For. That is an all mode radio, it is more focused on being used for SSB communications. You never even mentioned 1.2ghz. This is one of the only all mode rigs with 1.2ghz being offered right now.
I love mine for doing weak signal ssb. Check into nets over 200 miles away. Pet peeve is, wish it was bigger like the 756 or my IC-7410 (I have big fingers and I wish they would have back lit the buttons.) Next is the scope. Maybe it's just me and the set-up. But I can hear a weak while tuning around but they don't show up on the scope. I've tried the reference. Don't really help. It needs like a S8-S9 before it displays 73 W9DLP
From your commentary, it seems like you didn't know much about DSTAR or about this radio's excellent digital features when you made this video. This is a really fantastic radio for anyone interested in DSTAR.
not true ! Yaesu ft1000D has two noise blankers and they both WORK ON FM !! and they work on fm very effectively 30 year old technology NO Problem how did they do it ? there is absolutely a great need for noise blanker in fm
@@jimham1583 are you sure ? here's a link to 746 pro manual pdf reader page 64 (51 in the manual) : " Noise blanker not available in fm mode" www.manualslib.com/manual/281866/Icom-Ic-746pro.html?page=64#manual here a link to non pro ic 746 www.radiomanual.info/schemi/ICOM_HF/IC-746_user.pdf pg39: NB "this function is not EFFECTIVE for am and fm, or non pulse type noise pg3: NB switch: this function can not be used for fm
@@andhanwer The most basic fundamental of the fm mode is that the receiver has a limiter in it. That limiter means it saturates. Once it saturates (called full quieting) then amplitude variations don't affect it, meaning noise spikes don't affect it. It has been this way since the 1930s. The hf rigs that also include fm as one of the modes have the nb for the ssb, cw, and am modes. Look at 100 2 meter fm only rigs made in the last 40 years, or a Motorola - no noise blankers. Ok? Any more questions just post them, happy to help.
@@feeatlastfeeatlast5283 and when you're receiving an S2 signal the limiter doesn't saturate and noise spikes which are S3 affect it tremendously making the signal uncopyable, it is this way now in 2020
9100 is a really good radio (had one before). The benefit of a 91 is that is have HF (and 23cm if you have the module), but if you have a good HF radio already, well... 91 it’s old technology, nothing new and exciting, but it’s good technology! It’s big and heavy, ugly display comparing to the 97’s display. The capacitor in the 91 is “soon” out deepening if you have a old model (can work for many year’s.. never know). And you want (but don’t need them) filters in the radio for better operation, and they are expensive. The 97 is full SDR with new nice technology and have everything that 91 and a loot more!, but not HF. 97 have also better sound on both RX and TX. This a loot better.. and you know that this radio will work for many many years ahead, it’s new, that you ever know with a used 91... it’s old.. The question is, do you have a good HF radio already? Or du you need it? Then your only option is a 91 (if you only want one radio). But if you have HF or don’t need it, 97, easy! Myself, i would not go for a 91 today if i didn’t get it for a really really good price. Another option is a IC-7400/746 (only HF and VHF) and they are cheap! But all this radios is old radios, old technology and nothing exciting. I know one who owns a 91, and he want a 97. So that’s gonna be sold soon. So, if you ask me.. go for a 97, easy. If you have a 7300 already, well.. this two together is really nice.
@@jimham1583 Good morning, yes I already have a HF 590 SG radio, so you helped me decide to buy ICOM IC 9700 .... I also think I'll enjoy the GREAT price of IC 7300 and I will just buy two radios to make pairs on the table, it will be very cool. Thank you so much for your opinion, it helped me in my decision., 73
Wisconsin Dan the 9700 is 2meters 70cm 23cm radio aka VHF / UHF , the 7300 is 120meters 80meters 40meters 15meters 10meters 6meters radio aka HF / VHF .
Too many bands in one radio, something get compromised. I DON'T want everything in one package. Let's say my UHF tx goes and it has to go back to Icom. There goes my 2 meter and Hf rig also. I have 4 radio's going. IC-2730a dual bander, IC-7410-HF & 6 and the 9700
Get an IC-7100 then, mega compromise though, the 7300 with the 9700 is a far better setup. Or get the Yeasu 991 it has all bar 23cm and the compromise does show!
@@chickennugget3362 excellent choice. Those older flagship radios never really age badly and if you're not one of tue 5973 club contesters then makes no difference to the 7851.
Sorry guys but I must say as a licenced amateur of less that a year I have laughed myself into a state of agony watching this and reading some of the crazy comments. FM bandwidth for TX is fixed by the IARU and that is that. Every question and comment is answerable within all the reputable texts and books regarding radio. What seems to be wanted is the IC-7851 of VHF/UHF and yes 23cm is still UHF as under 3GHz. Stop whining and learn to adapt to how the radio works. CHANNEL NAMES? Learn your frequencies or just get a Chinese radio that does it with highly compromised performance. If this is the best you have, I would hate to hear your thoughts on a mediocre, regular radio. This IS the next addition to my shack to sit with the IC-7300 & IC-7100.
Most of the FM rigs have Wide and Narrow options, so it's quite normal to adjust TX bandwidth. Some bands have 25 kHz channel spacing, some have 12.5 kHz, it is NOT "fixed by IARU" worldwide/bandwide for just *one* value. And, regarding to the channel names, "Learn your frequencies" is not an answer for that, considering the price of this radio. For this price, it's quite understandable that you want it to know all basic features that are so common for cheap ones. But, in my opinion, it's just OK that the names are visible without the scope, since I watch the scope in VFO mode mostly. A bigger flaw is that there are only 99 channels to store your repeaters in.
@@ferdinandfrozenstein May I suggest you read the band-plan for your country please. 144-146MHz FM portions IS 12.5kHz 430-440MHz FM portion is 25kHz for REGION-1 (Region-1 IARU actually prefer 20kHz for 70cm but 25kHz is needed so is used). I'm using an ICOM IC-7100 for mainly 2m & 70cm and IC-7300 for HF, 6m & 4m. ALL UK repeaters are locked to the correct band-width and deviation for the band. I hear smart-arses all the time saying they Tx a stronger signal on mid or wide band on 2m. They are simply overmodulating. Also, I have all my local repeaters (90-mile radius and 3 within 10-miles) programmed into the IC-7100 (yes more memory space I know), along with V16-V47 (replaced the archaic 'S' channels giving the 12.5kHz spacing and using the dead space between. This also ties in with the channel reform for repeaters when more were needed for the repeater-hams, sadly there is always bleed to neighbouring channel, usually below) for 2m and U272-U286 for 70cm (check the RSGB band-plan in region-1 for the frequencies) and nowhere near 99 memories filled up. That could however become an issue when loading it up with satellites etc. Any way SSB is my mode of choice and range way outstrips FM. Not long after my last post I qualified as a FULL licensee, operating as MM0JNL so there is still a lot of current and recently changed band requirements still very fresh. I must also be one of the few who almost daily refer to the band-plan to ensure correct operation and just to keep it alive in my mind. 73 to all de MM0JNL
@@georgehaha6969 Yes, 12.5 for 144 band direct FM channels and 25 for 430 MHz band. But here also some people use wide on 145.500, so you can't use 145.4875 or 145.5125, since the wide guy is heard there too. However, since the band plans differ all over the world, it's good that any radio allows you to adjust it... (The wide guy from 145.500 always says his radio just does 25kHz and he can't fix it...:) )
@@georgehaha6969 Also, of course SSB is better than FM, but as I said, there are FM contests in my country, there are various mountain-toppers with FM handhelds whom you hear better with a good rig than with a Chinese mobile... I do VHF SSB a lot, mostly outdoors, and I like it, but there are situations when FM is the option, since just everyone has it.
