CB Radio RX Tune up without a Sinad meter

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So in this video i explain and demonstrate how to alighn a CB radio receiver without the need for a Sinad meter,
Some people would sooner spend £100 and much more for a pointless piece of test equipment,.
I have two and i still can't get a receive as good as i do doing it this way using a normal multi meter.
Don't believe me ? try it yourself then try it with a Sinad, trust me this way is easier more accurate and gets better results.
at the start -70dBm was showing -72.8 on my meter.
going to -100dBm is shown -6.9
and with -110dBm it was +22 but the tone was not audible.
After a quick tune up going over the inductors twice the results speak for themselves.
-70dBm was now -75.1
-100dBm was now -14.5
and -110dBm was now +13 and tone was now audible quite well.
so over all the all three signals shown an increase,
which i personally think i wouldn't have got using the Sinad method.
Try it yourself, After you've Liked and Subscribed..!!

Опубликовано:

12 фев 2023

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Комментарии : 42

@darrenbird2526 5 месяцев назад

Great explanation and easy to understand! Really helps me, Thank you!

@M0XFXUK Год назад

Hi Mark another interesting video.

@UDX-21 7 месяцев назад

Thanks for the video-- 21 S.C. South Carolina, leaving a like and hit your buttons. Happy Thanksgiving.

@CBRadioWayBack10-4 7 месяцев назад

Many Thanks, appreciate the support..

@UDX-21 7 месяцев назад

@@CBRadioWayBack10-4 Yes Sir, stop in sometime

@gtretroworld Год назад

This was the way i did them years ago and worked a treat for me too.Great memories restored there buddy…Have a Subscribe👍

@bigpimp347 Год назад

I've tried two Sinad meters and i get meter results using my old Altai needle meter, i use the digital to show how to do it easier, i use this as often also. i did a Uniden 100 yesterday and they show negative voltage off the VR but the numbers just need to increase, some radios the numbers need to go down, but you figure it out as you increase and decrease the input signal. so much easier and more accurate than a Sinad meter.

@paullucas4791 Год назад

Exactly how i do it, just work through the coil/ inductors a few times as you did. A simple voltmeter and a low input signal gen.

@bigpimp347 Год назад

worked for me for years, i do it this was as i can't concentrate on the SInad and fine a stable needle or digit easy to focus on.

@Langdon10 10 месяцев назад

I enjoyed the video. All I can say is that there is the right way and there is the wrong way, there is the trained way and there is the amateur way. I'm not saying which is best. Tis up to the end user to decide that.

@bigpimp347 10 месяцев назад

you are right there's the 'right way' but as proven by many people the 'wrong way' can equal or be better than the claimed 'right way' each to their own, i have two Sinad capable meters, and i won't use SInad.

@barbsblogs1563 4 месяца назад

Thanks for sharing 👌any tips on how to adjust the deviation with out an deviation meter ?

@CBRadioWayBack10-4 4 месяца назад

not really, but a simple way is if you have a good radio to use as a receiver, either HF set or a CB that's on frequency with a needle meter, with the RF gain down or so the needle is half way on the meter give it some audio talking as you would normally, the the needle starts to go backwards it's over deviating, so adjust the deviation until the needle stops moving with your voice and is stable.. i found using a President lincoln that once the needle (LED) stops flickering the deviation is around 3khz, which is a tad high to the manufacturers spec, but i set all mine at 3khz as normal voice will be around 2.5khz most of the time..

@tonybalm1513 Год назад

Very clever!!!

@bigpimp347 Год назад

It works very well, even some youtube techs who use Sinad meters have tried to get an increase in RX from a couple of my radios and can't.

@Chris-tx9ou Год назад

great video nice and simple - where do you get the ceramic trimmer tools from if you dont mind

@bigpimp347 Год назад

Just search ebay for 'ceramic screwdrivers' but be aware being ceramic they can break easily if you are heavy handed, same with the cores, if you use the wrong size or they are stiff they can crack cores same as a metal driver can.

@Chris-tx9ou Год назад

@@bigpimp347 perfect thanks great content look forward to more

@mattwells1209 Год назад

This method is not perfect, but does work to a degree, The reason if you use a signal gen and say you can hear the tone at 1hz -127 dbm with a DVM you can test at signal meter to get a MV reading as shown. but the first coil in the receiver you can open to give a higher reading on the DVM yet obliterate the Signal gen tone you can hear. as you Adjust to get higher DVM reading you are really letting in more noise to the receiver, this higher noise level gives you a higher DVM reading, this in turn makes weak signals disappear in the noise. A sinad meter shows you this. After setting first receive coil with a sinad meter, you can then use this method best with a DVM with micro volt reading and set receiver to highest reading. The same as you can set the FM detector using AC on a DVM for highest reading using speaker wires to AC DVM instead of scope as it will read siniwave in AC mode. Interesting video though and as stated in some tune up vid's wild adjustments on coils are no wear near good enough for a sweet receiver. best to go through it several times. cybernet FM rigs always had that awful pop in Squelch when the setting was just above noise floor with a kind of growl and pop as it opened to weak signals. To cure this and have a sweet squelch solder a 25v 16uf to Q14 on the emitter - and + to collector. pop and growl now gone and sweet squelch. Great to see people tuning radio's 👍

@bigpimp347 Год назад

I appreciate the reply, but practise quite often proves my way is better. i have been doing it this way for years and the amount of people who say they can now hear weaker signals better is amazing, and also a few of my radios have ended up going to Richard at Grantham and he himself can't not get them any better, proven in his video's (even an email he said he doesn't know why people send them as he can't get them better) there's the proper correct way, which works and is what used in the factory, and there's mine and other peoples way which works just as good if not better, and remember the factory alignment it a quick twiddle and within 5% or 10% mine is after 20 minutes warm up and checked several times before i'm happy with the outcome.

@japautosalon Год назад

I need to find the time in my life to learn all this .

@bigpimp347 Год назад

some things are really easy and with FM rigs if you have a good ear you can make a bad radio near perfect.

@lucianoocanha1956 Год назад

Great video. Just a question , where do you connect the multimeter 's red claw to the radio to extract this measurement ?? The point was not very clear.

@CBRadioWayBack10-4 Год назад

very sorry. i connect to positive connection on signal meter. this i usually set my meter on 2v setting and will see readings from 0.30v up to 1.50v depending how much signal is received (and meter setting) you cna also connect on to 'wiper' of the signal meter VR..

@lucianoocanha1956 Год назад

@@CBRadioWayBack10-4OK. I understood. thank you very much for the feedback.

@justinruth9729 6 месяцев назад

The detector and discrimination circuit is very important..if your gonna do it do it right

@bigpimp347 6 месяцев назад

Yes i agree, that's why you use a 1khz tone and either a good ear,or a scope to show it is receiving correctly then using the same tone and multimeter peak up the RX.

@765-AMPS 10 месяцев назад

Where do you connect the red and black probes of the signal meter? And what did you have in the mic jack? What’s its purpose? I wanna learn to do it this way.

@bigpimp347 10 месяцев назад

red and black probe go to the two wires on the signal meter, or black to negative power lead and red to positive of the signal meter. the item in the mic socket is a receive audio short, this radio requires a link from ground to RX audio to get sound from a speaker, so the plug in the socket is just a link to enable sound.

@765-AMPS 10 месяцев назад

Ok thank you so very much. I have a Koolertron DDS 60MHz Signal generator I use to send a 1KHz tone three the mic jack to see the waveforms on my scope. I’ve always wondered how to use it to check the receive and was contemplating buying a SINAD meter but your video brings up a valid point about the needle in the meter bouncing around making it difficult to get an accurate reading. Still new to the CB repair game and always willing to learn more. I’m assuming this method will work any radio so I’m still learning. If it’s not to much to ask could you explain the whole voltage thing to get a S9 signal. Not sure if your familiar with the Koolertron DD Signal Generator or not, but from what I was gathering from this video was I take my BNC to PL259 coax from output channel 1 and connect it to coax connector on the back of the radio, set the signal generator to 27.185 MHz (Channel 19) or 27.205 MHz (Channel 20) or water ver channel I’m gonna use to check the receiver, then set the tone to 455 MHz and use a multimeter connected to the power & ground probes on the signal meter of the radio. What does the multimeter have to be set at? Is 455 MHz what the tone needs to be set at? A cheat sheet would be amazing to have of this procedure. Sorry for this long replay and questions.

@bigpimp347 10 месяцев назад

@@765-AMPS ok, you can use a scope and tone and RF signal generator as a form of Sinad also.. as you say you view the waveform on the scope....connect the scope to the speaker.. you can then inject the RF signal to the antenna which also has a 1khz tone and vie won a scope, weaken the signal and the wave form goes distorted and dirty, as you peak the RX on a radio the wave form become cleaner and solid, so here you are cleaning up the received signal as heard in the speaker, so in effect bringing up the receive signal making it cleaner is working a similar way to using a sinad meter, the sinad works the same way, so you can use a scope as a form of sinad meter to obtain the same results, you just don't have the signal levels as in -115dBm to 12dB sinad, but if you're only interested in peaking the weaker stage of a radio for better reception the scope works good, then as long as your generator can send out a -73dBm signal this is to set the signal meter to be an S9 reading.. on the 455khz signal some radios will use this type of signal as a way to get the RX on frequency as not all TX and RX frequencies are the same. but experiment in different ways and find what gives you the best results., but ideally locate a radio service manual and read the procedure they suggest and see if you can obtain similar, same or better results trying different ways to peak the RX.

@765-AMPS 9 месяцев назад

What do you set the multimeter to to get the readings you need?

@bigpimp347 9 месяцев назад

@@765-AMPS usually around 2v the readings will be less than 1v depending on the radio.. sometimes at full signal you may get over 1v on some radios, others barely 500mV you have to find yourself what works best for you., i find inject a strong signal, S9 perhaps, put the multimeter on and check reading, then lower the signal, when i see the voltage move up and down a large amount then i use that setting, also to note some radios the reading will actually decrease as the signal gets stronger..!!

@tonyweavers4292 4 месяца назад

This looks an interesting video but the shaky camera makes me feel sick. Sorry 😢

@CBRadioWayBack10-4 4 месяца назад

Unlike fat fingers or the other radio narcissist's that are on youtube i don't do this to make money and a living from it. so i use a basic mobile phone and crap lighting.. if you feel liker you want to subscribe and pay some money feel free.. :)

@danwalkley304 Год назад

Sorry, I disagree, a sinad meter was created for a reason, and your statement " that's just the discriminator" is rediculus, tuning the rf stages for maximum signal is all well and good, but tuning the discriminator for maximum signal to noise ratio in an fm set is more important. , you can have an s9 signal and zero audio if the discriminator is out of tune. . So many "experts" on here , full service.? Don't forget the air filter ,lol

@bigpimp347 Год назад

No offence but you're talking tosh.. the discriminator or detector as another yourtube rig doctor calls it is done usually before you drop the signal and peak RX and double checked afterwards., this can be done on a scope to see the maximum peak in audio, using your ear for maximum deafness :) or even a volt meter across the speak for maximum voltage. my point is, you don't need a Sinad meter to peak RX, this is proven FACT by watching the other white coat wearing rig tech video's as some of those radios are actually mine and he admits "he can't get them any better" Also using a volt meter on the signal meter is more stable than the method shown using Sinad.. i mean after probably 30 years of doing it this way and hundreds of radios sold via ebay i've not had one bad comment of a radio being deaf, quite to opposite.. send me a radio or try it yourself..