Mr Darren hello, thank you for your interest. You'll find alot of 1N60 diodes in old AM radiosets and transceivers. Many old 23CH CB-radios used germanium diodes for the AM-demodulator- and S-meter rectifier. Best 73s to you...
SWIZZRADIOS yes I've got lots of old AM radios in my shank it just sad to take them apart I was lucky enough to find 1N60 Diodes from the net only paid £7 for 4 Diodes .thanks again for this video 73s to you
Hi there, thank you for asking. Yes, is to set (increase) the VR1 (AM) or VR2 (SSB) to S9+45. When you want to do this work (replace diode), the S-needle is far sensitiver than before. Then is important to set the full scale to S9+45. Best 73's..
Mr Rickable hello, thank you for your comments. I don't know, the new chinese SUPERSTAR has far different circuits. My old 3900 was manufactured in the year 1986 in taiwan. The PCB is very similar to this of the old SUPERSTAR 360FM. Best73's...
Hello dr OM. Yes the later CRT or RANGER based SUPER STARS, do not have this Problem with less channel rejection and lazy S-meters. I've an JOPIX 3900 in my shack. But the RX is good and the S-needle isn't lazy. I think, all in all, the new SUPER STARS are OK.... Best 73's to you.
The VR13 (AM PWR) is to preset the bias for the AM/FM output power. You should connect a true RF-wattmeter to the antenna socket, while TX-ing, set the RF-PWR to about 8 Watts. After this, you should adjust the VR8 (RF-Meter) to about S-8 while TX-ing. This is to set the RF-Meter to show the relative output PWR. Best 73's..
Hello. Currently some of these diodes are difficult to find. Please, which of these all diodes do you consider to be the best for this purpose? I ask you this so that I can focus on the search for the diode that you recommend me. Many thanks. Greetings.
Mister Scocolopez hello, thank you for your interest on my channel. The 1N60 low power schottky-diode is also OK: www.alldatasheet.com/view.jsp?Searchword=1N60 But if you can find, so take a 1N60 or AA111, AA112, These are all germanium types. I wish you good luck to find one of these diodes. Best 73 to you...
Hello. Thank you for your fast response. I have found the 1N34, you know this is germaniun type too. html.alldatasheet.es/html-pdf/73978/MCC/1N34/43/1/1N34.html What do you think about this one?. Again, thank. 73
Hello dr SUPER STAR user. Chinese SUPER STAR CB-radios, do have different circuits. So is a SUPER STAR 3900 in my collection, which has no problems with the S-meter or weak RX. I think, you should not modify a new SUPER STAR CB-radio. Best 73s..
Hello dear OM, thank you for visiting my channel. With the FT847, the AGC regulation needs to be improved. The interaction between the AGC regulation and the RF gain setting can better represent the differentiation of the signals. See also the operations manual on pages 36 and 37. This is where it is described. I hope you have a nice weekend. Best 73 ..
Fnordist hello again, thank you for the comment. Yes, Uniden radios and in some clones, is important to replace the 1.RF-stage transistor to a 2SC2999. This is a low noise and high gain RF transistor. It's done in all my Uniden radios and clones. So President Adams / Palomar SSB-500 (TR5), Teaberry Stalker 9, Stalker 15, / President Mc Kinley (Tr9). Stalker 9 DX, Stalker 20 / President Mc Kinley DX (Tr14) President Grant DX / Superstar 360FM (Tr17), etc. Have a nice week end ... 73s ...
Hello dear Friend Swizzradio, is there a noticeable difference in the replacement for a 2SC2999 ? Can we hear it ? So is this worth doing it ? As i guess a realignment is needed ?
SWISSRADIOS - why do some seller call the TO-35 Diodes Germanium and others call them Schottky Diodes? The Schottky Diodes have a lower Turn-on-voltage so why are they not used in this circuit?
Mister William hello, thank you for your interest. The GE diodes are called GERMANIUM diodes, because the semiconductor-material is made of GERMANIUM-Metal. These diodes begin to conducts in about 0.2-0.3 Volts. The Schottky diode (named after the German physicist Walter H. Schottky), also known as Schottky barrier diode or hot-carrier diode, is a semiconductor diode formed by the junction of a semiconductor with a metal. It has a low forward voltage drop and a very fast switching action. I think, you can use a Shottky also for the S-Meter rectifier in your CB-radio. Happy airwaves to you....
Mr Bill hello, there is a very interesting video about a shottky diode. The shottky works very fine on HF: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-bXEyCf1P0UU.html Have a nice sunday...
Would you have a copy of the schematic shown in the video? I have the service manual for this chassis and also downloaded several versions online, but they are mostly scans of photocopies of photocopies... Your version is exceptionally clear! Did you draw it using a computer package?
Thank you vor your interest. Yes the CAD schematic of this PCB is this from a MIDLAND 8001 and very similar like the SS3900. I think you'll find the schematic on CB-tricks. Best 73s to you..
Couldn't find one on cbtricks.com for the Midland 8001 unfortunately. In the meantime I downloaded KiCad and started on the learning curve. I'll maybe end up with a complete CAD schematic in a few years :D Thanks for the reply.
Regardless of the Supplier you get your Diodes from - always check the Diodes Turn-on-voltage before using because 1 out of 100 may actually be bad from the factory. A good multi-meter in Diode Function should give you a good reading.
Mister Ernest hello, thank you for your interest on my channel. The COBRA 148Gtl has a very different PCB like the COBRA 148 GTL-DX (Superstar 360FM). D71 is the diode for the S-Meter read out. But the D71 is already an 1N60 in the schema. But with VR1 (AM S-Mtr) and VR2 (SSB-S-Mtr), you can adjust the S-Meter read out. I hope you'll find the Problem. I wish you a happy new year...
Mister Harry hello, thank you for your interest. Diode D7 & D8. Both are to replace with Germanium type 1N60. Then ist do to readjust the VR1 (S-meter). I wish you good luck at the mod. Happy airwaves to you...
Hello a have also a lazy S-meter, bud the cb a have is an old superstar 2200. I also think that there are 2 transitors out of order. Do u have a good electric schematic drowing of this cb radio thanks.
Mr Rene hello, thank you for the interest. You'll find a schematic on CBtricks dot com. The SUPER STAR 2000 uses the similar board like the 2200 or 2400. Best 73's to you.
Dear Sir my smeter is lazy and i removed the diode and replaced it with a germanium diode that i tested . But i can not improve the s-meter when i turn the VR1 . i don't see any differance . I do not have your expensive rig that you use for calibrating. Can you help me with my problem. Thanks greetings Edgard
CB radio friend hello, thank you for your interest on my channel. Yes, it's possible, that the potmeter VR1 (AM) or VR2 (SSB) is defect. I had this problem on other radios. It' s most the problem on the rotator. To less pression on the graphit. Please take a look to the potmeter. I wish you good luck to fix the S-meter path. Happy airwaves to you...
@@SWIZZRADIOS Thanks for the info the/ both the potmeters VR1 en VR 2 are 10 KB. What does the "B" mean or is this not important? Can i find these potmeters on the web? Maybe you have a link to a site. Thanks from Edgard from Belgium
@@PIRANHAE I'm sorry sir, but I'm very busy to time. Yes, the Letter B is the info for a logarithm variation of the Potentiometer. Potmeters without the Letter "B" have lineare scale. It's a tricky thing to find potmeters with logarithm scales. I hope that I could help you. Best 73 to you...
@@PIRANHAE I'm sorry sir, but I'm very busy to time. Yes, the Letter B is the info for a logarithm variation of the Potentiometer. Potmeters without the Letter "B" have lineare scale. It's a tricky thing to find potmeters with logarithm scales. I hope that I could help you. Best 73 to you...
Hi there. After 10 years without activity my SS-3900 has the lazy neddle but when x-mit, even if I checked it with a wattmeter and the power in AM/FM(5W) and SSB(12W) is ok. Do you have any clue how to solve this problem?
Sacmachetus hello, thank you for the interesting. Please check VR8 (100k): Turn it fully ClockWise or Counter ClockWise. now it should make contact again. Or check C164 (1uF) for a possible short circuit. Then D87/86 (1N4148) also for a short circuit. I think, these are the possible Problems. Good luck...
Mr William hello, thank you for your interest. The Test set is a STABILOCK 4039 by Schlumberger. It's a very nice Equipment from the late 80ies. Ideal for CB- and HAM-radio settings. Best 73s to you...
Mr ZERO X-Mission hello, thank you for your interest. For this case is it no difference between the 1N60 or 1N60P. It's only a demodulation of the IF-frequency carrier. You can use both diodes. I wish you good luck for the modification. Best 73s to you...
@@SWIZZRADIOS Hey, also like myself, except for the Smartphone for RU-vid! =) I have no Facebook, Twitter, Instagram, etc account, only 27MHz! =) Best 73s and happy airwaves (with no noise ;) ) to you also. Take care.
Sorry but that 50uV=S9 is not correct. For HF (and 27mhz are in HF band), the S-9=-70dBm. and -70 dBm is 70.7uV. See this page: en.wikipedia.org/wiki/S_meter
I'm sorry sir. All my measurements and settings are based of all the infos on the ARRL level chart. The fact. 50uV (in to 50 ohms) are -74 dBuV or -73 dBm. The International Amateur Radio Union (IARU) Region 1 agreed on a technical recommendation for S Meter calibration for HF and VHF/UHF transceivers in 1981.[5]IARU Region 1 Technical Recommendation R.1 defines S9 for the HF bands to be a receiver input power of -73 dBm. This is a level of 50 microvolts at the receiver's antenna input assuming the input impedance of the receiver is 50 ohms.
My SUPER STAR 3900 does NOT have a LAZY meter.It has the opposite since it's easy to peg it out.I will adjust it but at least it works which a week ago it did not at all nor did 4 other rigs I was given & now they all work! {:>)
In Pursuit of the Better Crystal Set - Germanium diode selection - baec.tripod.com/articles/crystal.htm. This gives a chart with the varying voltages for the diodes.
