I just finished repairing a IC-703 that had a bit of a lightning strike and had to replace a handful of components; relays, PIN-diodes, YGR-amplifier etc. As part of the repair I performed a full factory reset. And since the radio had a FL-52A installed I referenced your video to remember how to set it up in the menus. Very helpful. Also wanted to take this opportunity to thank you for your very informative and interesting videos. Whenever you release a new video, it's like a special occasion for me. You inspire and educate, thanks for all you do.
Thanks for the great video. You inspired me to install this on my 703, which was an install job quite outside my comfort zone. Would not have attempted without your guidance. I found your comments re: the JIS #2 very helpful. I took 9 of the 10 screws out with an ordinary Phillips head, but the last was beginning to strip. Halted the project for a couple days while awaiting the appropriate screwdriver from Amazon. After that, it was a breeze. Thanks again!
Very helpful video. I especially appreciate the demo with the scope and pulsed signals. I love my IC-703+ and have the ICOM 500Hz FL-52A installed. I prefer the 500Hz over the 250Hz as it is less shrill sounding. The 400Hz INRAD filter would hit the sweet spot... good choice!
As an old dog attempting to learn a new skill, as in getting vintage test gear to behave, your videos are way above my pay grade. But I always learn where all the rabbit holes are located and what to sniff for. And for that, greatly appreciated. Thank you! Cheers from Utah!
This gives me an idea for a future video: The basics of crystal filters. I understand how they work at a high level, but they've always seemed so exotic.
Wow. This was so good to see. You make me want to get my lazy butt back on the key. Super cool!!!! I still have your "Scopes for dopes" DVD presentation. I learned so much from that. Thank you!
Can I just say that I have enjoyed your videos for some time immensely, but not had the chance to say so. You have a unique combination of expert level tech skill, personality, and ability to teach in videos that, in my opinion, are just the right size. Thank you for everything you have and will contribute to the electronics and ham radio communities.
I have the 52 filter ,which is supper, this 400hz will be tight enough for most , i have a few cw rx clips on YT ,working great . Fitting the filter was about the limit of my ability, but worth it . Great video. Thanks.
The FFT image sure brings out the skirt selectivity feature better than can be done in a still image. Same for the IF Shift function. I have a 706 Mk IIG, the QRO version of the 703. Immensely enjoy it with its narrow SSB and CW filters. 73, VE1YY
Well, when you showed the commercial filter, with the attendant sticker-shock, I thought sure you'd show us how to build a homebrew one. Anyway, still interesting and you did a very good job of graphically showing its effect in conjunction with the IF/PB. Thanks & 73...
There are a few different sizes. You can tell a JIS screw often times from a dimple in the head, or the fact that the slots look wider/fatter than ordinary Philips.
Not to be confused with pozidriv! Old school HP and Tek gear is chock full of pozidriv fasteners. If you happen across some that haven't been destroyed by someone with a phillips driver, do your best to keep them intact.
Good video to demonstrate how filtering works on the radio. It's good to actually see these things vs reading about them. There are often so many features on many of the newer radios today and I'll venture to guess that lots of folks new to the hobby don't know what half of them do!
I just purchased an Icom R75 receiver that uses the same filters. Filter 1 is a 2.4Khz SSB 9Mhz filter and slot 2 is open for a 455Khz filter. Since I operate POTA in very crowded pileups at times, I am considering getting the 250Hz filter as I think once I gain the knack of the Passband tuning I think it will shine when 5-6 stations are calling within 200Hz of each other or at least help to pick out enough letters to call one station at a time back, LOL. My TX is a homebrew 2-watt Two Tinned Tunas xtal controlled rig with a VXO to go a few kHz up or down to find the quiet tx spot, LOL. Cheers, Davey - KU9L PS-Thanks for the video!
@@w2aew I'll find out shortly. If it was a severe problem there would be YT videos pointing that out & Icon does extensive testing before offering it. Perhaps aftermarket filters don't work as well. The IC-53A, Rev A tells me something did not work well on the original part, lol. Cheers, Davey - KU8L
Alan - I saw the price of that filter and thought 'Wow! That's a lot of money!' Then you showed us the effect and I thought 'Wow! That's almost sorcery!' I've never really dabbled with HF and I don't know Morse, so that was a real eye opener for me.
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The IC-703 is still and will always be my favourite QRP Radio of all time.And no Yaesu FT817/818 or crap like Xiegu will ever beat that...swear to god. 73's de Your Friend Uncle Guenter
I have the 706 MK2G. Wow they look quite different inside and I believe there was no soldering involved in installing the new filter on the 706. I agree about the 250 hz being painful to listen to. I used one in a Kenwood (TS440?) years ago at a Field Day and couldn't stand it. It did do a great job filtering out unwanted stations though! I decided on the 500 hz filter for my Icom which I got on Ebay years ago for about $35 used. I had a 500 hz filter in my Kenwood 599 twins when I was first licensed and loved the way the receiver sounded. Icom also made a 350 hz for RTTY and I wasn't sure how it would work for CW which made it even harder to decide. I was torn between the 500 and the 350 hz filters. I was lucky to buy this when I did. WOW they are expensive now! I do some listening on AM and I'm not sure how the wide band 2.8 Khz SSB filter would work on this mode, so I never bought one. I'm wondering if you or anyone on here has used any of other filters on these modes and what results you've had. Thanks for the great video! and 73's W1RMD.
Thank you! Very revealing video. Only the price of filters is simply enormous, but it is too uncomfortable to work in CW without a filter. I bought fl-232 for my ICOM 706MK2G from a local guy for only 35 bucks and it's a big stroke of luck.
@@w2aew I read a little more about filters and I understand that they are applied to different intermediate frequencies 455kHz (FL-52A, 53A) and 9MHz (FL-100, 101, 232), but is it the reason for the different shape factor 2.0 and 2.8-3.2 respectively? What value will the different shape factor ultimately have in the case of 703 and 706, respectively, taking into account the different intermediate frequencies If do the same experiment with two tones for the 706?
@@ukrainehamradio Having the filters earlier in the conversion chain (such as in the 9MHz IF) is advantageous to reduce interference, AGC pumping and IMD. But it is much harder to make very narrow filters with good shape factor at these higher frequencies. That is why you often see the narrower, more selective filter in the later, lower-frequency IF stages.
I was making CW 300 Hz filter , I was able to make good ladder filter using 8 crystals up to about 15MHz. I tested many different frequencies from 32khz , 455khz to 30 MHz fundamental, and 150 Mz, 220 MHz using Inverted Mesa crystals as ladder filter configuration. anything below 1Mhz did not work very well too much loss too high series impedance . 15Mhz worked well, 30 Mhz it was too much frequency difference so it start to become broad. at 150, 220 MHz, it gave about 30 khz side, but Inverted Mesa crystal their frequency variation are around 50 ppm. but the filter was adequate for front end use using 2 to 3 crystals. AG6JU
Great demonstration. You would likely get a better idea of the filter shapes on your scope if you turned on waveform averaging. It would be less noisy.
Great video! Really interesting to show how the steep skirts are really important for close CW signals. Maybe you could do a video showing the filtering available in an SDR based radio like the IC-7300. Is it better or worse than the mechanical filters?
@@w2aew If I ever stumble on one I'm not sure I'll be able to say no. I love my 857D but VHF/UHF and 100w aside, the 703+ is killer on everything else!
Great congratz. I using most Audiofilters analog like the Datong FL3 ,itts sound more naturel than a 300Hz filter .But maybe its on my ears have fun ON3MK Mor 73,
Very fine demonstration, Alan, thanks! I've been contemplating installing two NOS filters that I bought some time ago for my Kenwood TS-830s and your demo has convinced me that it is not too difficult. What are your thoughts on installing pin sockets so the filters can be removed later without desoldering them? Is that a good idea or not? Keep those videos coming -- I learn so much from them! 73... KD2ORG
In many rigs, the optional filters are socketed - just not in this one. In this case, installing pin sockets wouldn't work since there wasn't enough clearance.
@@w2aew May be it's time to try design such filter. From my point it's like drug monopoly , there are only few this time who producing analog filters and I don't believe that this cost is true.
Nice! I wonder how this would compare to just adding a narrow audio filter to the speaker output? Either a DSP filter or switched cap. Or straight analog filter using op amps?
I've been confronted with a lot of HF noise on a DC power supply mixed in with the local 50Hz AC rumble. I got the 50Hz pretty easily under control but I keep getting HF noise in the order of tens of mV. Any suggestion how I could get rid of that or at least reduce it to a couple of mV? Maybe a notch filter with wide response? I liked the video, because it illustrated the use of filtering beautifuly. Thanks for sharing, gave you a thumb's up... been subscribed to your channel for over 5 years now :)
For filtering on a power supply, you'll need a mix of large capacitors (for your 50Hz noise) and lower value capacitors for the HF noise. The reason is that the large value capacitors are not effective at high frequencies because they'll be beyond their self-resonant frequency. So, try using smaller caps, such as 1nF, 10nF, 100nF, etc. to lower the HF noise. Place these as close as possible to the point of load.
The RF Noob is correct, but in this particular case I was using a simple resistive combiner/splitter - a homemade version of something like this: www.microwaves101.com/encyclopedias/resistive-power-splitters
Sir, Can you explain when 1khz modulating signal and say 10khz carrier signal are amplitude modulated ,then how 11khz( Fc+Fm) is generated through Vector representation. If we add a carrier signal of Acosw0+ 0 Phase with a modulating Signal, is the phase of the carrier wave is changes continually .And why the carrier frequency amplitude suppressed when the amplitude of the modulating sinal increased
Amplitude modulation involves multiplying the baseband signal and the carrier. This is what creates the upper and lower sidebands (basic trigonometric identity). A DC offset is added to the baseband to preserve the carrier. If the baseband is centered around zero, then the carrier is suppressed.
@@w2aew ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Y8AOOd_yFzk.html .Can you make a video like that you made for IQ modulation of quadrature signal . I have make video of baseband signal {above}. I am not able to visualize the multiplication of messege signal with carrier signal in vector model. My RU-vidvideo baseband signal representation using vector is above
Once again,Thanks! Excellent demonstration and video. Btw. watching ads while browsing videos on your channel does not bother me at all, unlike on some other channels, because i know it is always worth waiting and you certainly have earned that income. 73 Jyrki OH1XYZ
Hello ,very interesting videos ! I would like to talk to you how do we contact each other I would like to know if you can help me to do a Link budget !? please
