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Пікірлер: 33
@ronedwards82395 жыл бұрын
I built and repaired precision meters for 16 years at a top manufacture. Those springs are called Hair Springs. I soldered them with no glasses to the tabs if the meter armatures. We then centered them with special tweezers around the pivot. Crimped them with another special tweezer, and soldered them to the zero adjustment. The pivots are seated into glass jewels. They are cone shaped. Cheap meters do not have spring back jewels. Meaning they don’t have a spring below the glass jewel to help prevent friction from worn jewels from over tightening or vibration. Friction shows up when the meter does not return to zero until you tap on the meter. We also built the Bird meters. Many of our meters were taught band suspension. No friction. A platinum band is soldered in a spring with a track for the band.
@TRXLab5 жыл бұрын
perfect explanation thanks for sharing...
@LMVRCRacing5 жыл бұрын
I feel like this was an intentional design choice by many of the CB radio manufacturers over the years. On many amateur radios, it's not uncommon to see an S3-S4+ ground noise level with an antenna connected, but CB operators want the needle to be all the way down when there are no signals. If they calibrate the movements to show very little deflection at an S3-S4, then the user gets what they want. This Navaho is probably a little worse than most, but it does what most people want their CB radio meters to do.
@philipacovington2 жыл бұрын
On analog radios, the s meter reading is often derived from the receiver's agc. This is a big reason for the non-linearity.
@omarkert5 жыл бұрын
I absolutely Agree Mike. My TRC 457 has the same issue. and yes the S meter is for reference only. Great point you make here for people to see about Analog meters
@johncundiss90985 жыл бұрын
Just crank that meter adjustment to a higher reading so that it does read the low levels better. It would not be accurate anywhere but Mr. consumer would be happy that his meter is bouncing around good. Probably wouldn't know any different.
@johntownley834 жыл бұрын
I wish i could get a hold of Mike i would love for him to work on a few of my radios. Im very OCD. I love his style. He seems to be a little OCD also and a perfectionist. that's the best type of technician you would want to be working on your radios. Your radios would be fixed or peaked and tuned to perfection. They definitely would not be a SPLATTER BOX or a MUD DUCK radio.
@nineinches4 жыл бұрын
Yeah' I have a Colt 1000 base with a similar issue, Oh well just add an S point or two on radio checks. Great video Mike !
@williamcolvin36094 жыл бұрын
Hope you get a chance to come back with some more repair videos - I for one miss watching you do your magic on the radios. Hope you and your family and friends are all doing okay.
@paulshepard34382 жыл бұрын
I agree!
@williamcolvin36094 жыл бұрын
We have quite a few guys here in the ARK-LA-TEX Area that would love to get you to work on their radios - there are very few people that can ACTUALLY REPAIR a radio most are just want to be shops which just destroy radios.
@BoB4jjjjs4 жыл бұрын
Yes, you did explain that well. I have seen digital meters way off. They di tend to be a bit better, but I like to see a neter moving, maybe I am just someone with an old timer#s mind set.
@bblod48965 жыл бұрын
Ah, my first CB was a Realistic Navaho 23 channel purchased brand new back around 1973. I wish I had kept it.
@val0583 жыл бұрын
its the receiver circuitry not the meter. connect a commercial very nice analog meter to the navaho's meter wires and watch same scale "tightness" on lower end. I've done it.
@johncundiss90985 жыл бұрын
I see a lot of meters, if you look at the scale printing on it, they actually try to print the them in a way to compensate for the no linearity. The points that represent s meter levels are actually spaced apart differently. My thoughts anyway. Even that is not always that good. Cool video.
@paulshepard34382 жыл бұрын
I think he is spending too much !!!!!!!
@Charlee20155 жыл бұрын
Another great, infomative video
@andreaspersson18862 жыл бұрын
Hi Mike! What do you think about a President George who is missing the S-meter 7? The RF, Modulation and SWR meter are still ok! I have replaced 4 transistors; DTA114TK but no succes...
@Greg-et2dp Жыл бұрын
Mikes radio repar my hobbies are painting pictures and listening to shortwave and ssb I have 5 shortwave receivers iam thinking about getting my ham license
@Greg-et2dp Жыл бұрын
Mikes radio repar the owner Realistic Navaho am/SSB 40 channel CB radio is awesome
@jonmullins84605 жыл бұрын
So I'm not crazy. I have the same situation on my Ten-Tec omni that I've refilled with magic smoke. Once I got it to receive it sounds great but I compared the S meter to my Icom 7300 and got very similar results as you have here. I couldn't figure out why to save my life. Now I know.
@harbselectronicslab35514 жыл бұрын
The split signal being the same in this type of voltage divider setup assumes both radio's have exactly the same impedance.......although assumed to be 50 ohms, it can be different.
@francismcclaughry3794 Жыл бұрын
the difference in the navho of mine is that it don't have the clock.
@francismcclaughry3794 Жыл бұрын
you had a midland on your last video that you made. I just wonder if you fixed it. could you preform Marcel on it?
@paulshepard34382 жыл бұрын
Is Mike a Canadian in the U.S. or a real America?
@Greg-et2dp Жыл бұрын
Mikes radio repar iam thinking about getting a hand held am/fm/SSB 40 channel
@bmh67wa5 жыл бұрын
If he still doesn't think it works well I would be more than happy to dispose that 457 for him. I would dispose it right next to my 458.
@electron00025 жыл бұрын
Black tape alway fix my signal meter on my radios.as long as i can hear the people im taking too i not care about the signal there giving me..yet again a good video
@kardeef333175 жыл бұрын
When I was studying for my water license, a answer to a question was that meters PSI and such are most accurate at half there scale.
@orange703835 жыл бұрын
Is that where the term 73's came from.
@ronedwards82394 жыл бұрын
I stated in another one of your videos these meters cost pennies to manufacture. They are absolute junk. They will not track accurately. Set S9 at -73dbm and the rest of the scale is a joke!
@snowylonewolf47505 жыл бұрын
Would like to send you a radio or 2 to have you do your magic