President Lincoln 2 / Plus - RX SSB AGC mod

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tcom75
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President Lincoln 2 / Plus - RX SSB AGC mod

Post by tcom75 »

Hi everyone,
are there any updates ref. the well known issue for the bad (warble audio) SSB RX with the new Lincoln 2 / 2 Plus?

Anything that can be fixed with the hidden menu?
Is there a way to upgrade the firmware in order to fix this?
Anything that can be done on the circuit?

President is still ignoring that they sent out thousands of units with a big issue and they simply don't care.

Thanks for anyone that may be able to provide some guidance here.

73, KP235 Steven
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by Edd200sx »

You’d need a schematic to trace out the AGC circuit
And change some parts. I’ve not got involved with this
Before on these so I couldn’t say what values etc
Last edited by Edd200sx on 02 Mar 2022, 21:10, edited 1 time in total.
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by cb4ever104 »

It amazes me that President , after 45 years in the CB radio business , can pump out radios with these sort of issues :think: :think:
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by ch25 »

Just get rid of that junk.

President is not a maker anymore, it is just brand, nothing else.
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by Auldgeek »

My Lincoln 2+ has no such fault. Sure, the earlier versions, especially the V1 & V2, did have this, but not sure of the + version (some call this a V4)
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by cb4ever104 »

ch25 wrote: 02 Mar 2022, 16:22 President is not a maker anymore, it is just brand, nothing else.
Apologies. Bad choice of words on my part. After 45 years in the business , President should be able to find a manufacturer who's capable of producing radios without these kinds of issues.
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Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by Auldgeek »

tcom75 wrote: 02 Mar 2022, 11:00 Hi everyone,
are there any updates ref. the well known issue for the bad (warble audio) SSB RX with the new Lincoln 2 / 2 Plus?

Anything that can be fixed with the hidden menu?
Is there a way to upgrade the firmware in order to fix this?
Anything that can be done on the circuit?

President is still ignoring that they sent out thousands of units with a big issue and they simply don't care.

Thanks for anyone that may be able to provide some guidance here.

73, KP235 Steven
Can you let us know what version of the Lincoln 2 you are referring to? V1 had awful AGC overshoot. President came up with a dealer modification that required a few components to be changed. At the time, dealers and President fixed this FOC.
V2 implemented these in production from Qixiang. V3 improved a few other shorfalls. The Plus model introduced 12m.

As far as I know, there is "NO" firmware or adjustment from within the engineering menu for this particular issue. Only fixed in hardware.
If you are proficient in SMD work, it's straightforward. The factory modification is available at the link below;

https://simonthewizard.files.wordpress. ... 3-2014.pdf

As mentioned earlier, I have the Lincoln 2 Plus and there's absolutely no sign of any AGC issues (warble) on strong SSB signals.
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by Edd200sx »

Auldgeek wrote: 02 Mar 2022, 20:49
tcom75 wrote: 02 Mar 2022, 11:00 Hi everyone,
are there any updates ref. the well known issue for the bad (warble audio) SSB RX with the new Lincoln 2 / 2 Plus?

Anything that can be fixed with the hidden menu?
Is there a way to upgrade the firmware in order to fix this?
Anything that can be done on the circuit?

President is still ignoring that they sent out thousands of units with a big issue and they simply don't care.

Thanks for anyone that may be able to provide some guidance here.

73, KP235 Steven
Can you let us know what version of the Lincoln 2 you are referring to? V1 had awful AGC overshoot. President came up with a dealer modification that required a few components to be changed. At the time, dealers and President fixed this FOC.
V2 implemented these in production from Qixiang. V3 improved a few other shorfalls. The Plus model introduced 12m.

As far as I know, there is "NO" firmware or adjustment from within the engineering menu for this particular issue. Only fixed in hardware.
If you are proficient in SMD work, it's straightforward. The factory modification is available at the link below;

https://simonthewizard.files.wordpress. ... 3-2014.pdf

As mentioned earlier, I have the Lincoln 2 Plus and there's absolutely no sign of any AGC issues (warble) on strong SSB signals.
Nice I’ve not seen that before. Pretty straightforward

To op
If you want and the mod needs doing I do smd work here

I see you’re in Italy maybe not 😂
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by tcom75 »

Thank you for the information.
The model I have at present is the 2 plus (II +) also known as V4. And it does have the AGC problem.

I will go for the suggested mod since I can manage SMD work.

Yes I am located in Italy and this is my second Lincon 2 Plus with the same issue.

73, KP235 Steven
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by Auldgeek »

tcom75 wrote: 03 Mar 2022, 12:57 Thank you for the information.
The model I have at present is the 2 plus (II +) also known as V4. And it does have the AGC problem.

I will go for the suggested mod since I can manage SMD work.

Yes I am located in Italy and this is my second Lincon 2 Plus with the same issue.

73, KP235 Steven
Thanks for the clarification. That listed modification is only relevant for V1 & V2 only. However, you may be able to look at the modifications and compare to your own. I certainly do not have this issue, but I have heard many owners of earlier versions who do not have that issue either. It could well be production run specific, although I would have thought that all II+ models would have been fixed.

Good luck :thumbup:
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by cb4ever104 »

ch25 wrote: 02 Mar 2022, 16:22 President is not a maker anymore, it is just brand, nothing else.
Going back to this . Who actually designs the radio ? I mean do President design the circuit and give it to these Chinese guys to manufacture . Or , do the Chinese manufacture the radio first and then ask suppliers like President etc. if they want to buy them ?

S.
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Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by Auldgeek »

cb4ever104 wrote: 03 Mar 2022, 17:02
ch25 wrote: 02 Mar 2022, 16:22 President is not a maker anymore, it is just brand, nothing else.
Going back to this . Who actually designs the radio ? I mean do President design the circuit and give it to these Chinese guys to manufacture . Or , do the Chinese manufacture the radio first and then ask suppliers like President etc. if they want to buy them ?

S.
Hi Sammy, As CRT, KPO, Stryker radios use the same main board, I can't see President designing much of this side. They may have a say in how a radio looks physically, and as the menu is different from say Qixiang in-house branded Anytone, I'd say President will be involved in this. For example, they are the only manufacturer I know that adopts the pyramid style of banding, so that will likely be a Presdient thing.
I do know they have a servicing division in France, so I'd expect some input. However, I'm pretty sure that President will have a list of wants, and Qixiang use their board and fabrication to complete the radio at Presidents bequest.
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by Auldgeek »

I might add that if we're talking about other President radios, I think the Grant II is Uniden. I may well be wrong though.
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by cb4ever104 »

Hi Drew .

Yeah . That makes sense . So each supplier (President , Stryker etc) will buy the request the "main" radio from Qixiang , and then get their own individual quirks made for each brand . I presume that's the way it was done with Uniden/Ranger too . I just wasn't sure who actually came up with the initial design for the initial pcb .

Cheers
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Ex GM0 , now EA5 .
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Radios ....? Anything that says "TAIWAN R.O.C" on the back.
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Re: President Lincoln 2 / Plus - RX SSB AGC mod

Post by 13EL121 »

Indeed all Lincoln 2 have this AGC issues. V2 is a the best version which I still have here. V3 and V4 are more effected with the bad AGC.
The CRT9900 does not have this problems.
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