Ic-211 Service Manual

Icom Diagrams, Schematics and Service Manuals - download for free! Including: icom 78 service manual. Icom ic 211 instruction manual. Service and repair manual download: ICOM IC-211 TRANSCEIVER REPAIR Manual.

RigPix Database - Icom - IC-211 Last modified 2015-09-30 Icom IC-211 SPECIFICATIONS GENERAL Type: Amateur VHF transceiver Frequency range: 144-148 MHz Tuning steps: 100 Hz 5 / 10 KHz Mode: FM/SSB/CW Channels/memory management: No Repeater shift/offset: No dedicated.

Hi all, I am in the process of restoring an IC-211. It was basically dead when I got it. After resoldering the feed throughs on the display board and the PLL board, replacing an IC, several switching diodes and 3 transistors, I have it where all the features functioning. That is squelch, usb, lsb, cw, meters and the like. It also transmits and I am able to measure 1 watt out on FM as well as key up some local repeaters.

My problem is in adjusting the PLL/VCO. I have instructions on the alignment from SV8YM and a BK 520 mHz frequency counter. So I should be all set; nope. Evidently there is more to messing with these adjustments than just do it. The slugs in the VCO are sensitive and interreact (L1 and L3).

In addition there are settings where every thing becomes unstable and others where it locks fairly well. I have managed to get it somewhat tuned, but it reads 10 kHz high; i.e., 145.500 reads 145.510. When I started it was off 80 kHz. But I am not able to obtain all the required frequency adustments.

My questions are; what is the correct way to connect a 50 ohm counter input so the reading is accurate and stable? I suspect my probe is causing part of the problem. Should I make a 50 ohm probe that terminates in a 50 ohm resistor at the counter input? Is there a general methodology for adjusting PLL/VCO circuits?

Does anyone have experience with the IC-211 alignment? Is there some question I didn't ask and should be asking?

I am actually having a great time getting this thing back in operation and learning. Now if I could just master this PLL alignment!

73 Stan KK7QN Logged. You can download a operating manual or a service manual for the ICOM IC-211 at free.

I recommend the service manual for the best information on alignment. As far as a preferred or 'correct' way of tuning PPL circuits it varies with the circuit. First the master oscillator should be set to the correct frequency as it controls the accuracy of any succeeding adjustment.

Then follow directions. Remember there may still be faults or bad components in the PPL loop even it 'seems' to work pretty well. Often if components have shifted values from age or heat or whatever, the loop may become unlocked at one end of the frequency range. So when you get it adjusted you need to check that it stays locked over the entire frequency range. GL Allen Logged.

Thanks for the suggestions. Unfortunately the 'service manual' is not available at only the Operation manual and a modification for the VCO is there. I have 2 Manuals one for the IC-211(original) and one for the 211E(pdf copy) with operating instructions and circuit descriptions. Evidently there were several versions of the PLL/VCO circuits over the life of the 211. My schematic almost matches the hardware I have, but it differs a little. The schematic is a seperate sheet labeled A-012 and a disclaimer that components may be changed.

As it is setup now, the receiver does track from 144.000 to 147.999 and appears to be stable. Except it is actually tuning 144.010 to 148.010. If anyone knows of the location of an actual IC-211 'Service Manual' I would be greatful. Of the many sites that offer manuals for sale, it's hard to tell what they are actually selling and may just be what I already have. ICOM service says they don't have one either.

Regards, Stan KK7QN Logged. Well, I pretty much have the PLL/VCO aligned. Turns out in the alignment procedure for this rig scanned by SV8YM there are several errors. I have cleaned up the procedure and will make it available as there seem to be a lot of these IC-211's that don't work floating around. You were right on the master oscillator. Free Download Film Kartun Kisah Nabi Nuh. In the PLL version I have there are actually two crystal oscillators. They are controled by switching diodes.

One is for 144 to 145.999 mHz and the other kicks in at 146 to 147.999. The lower one uses a slug tuned coil to adjust and the other(higher) uses two trimmer caps. Evidently they did this so that below 146 mHz the tuning increments in 100 hz and above 146 in 5 kHz steps. In the IC-211E version the second oscillator is eliminated. In the process of learning I, of course, ruined the slug in the tuned coil.