Anytone 6666

[rabbiporkchop]

Why? Its below the noise floor of every single HF band anywhere on planet earth. Even if you went into outer space it would be below the noise floor of every single HF band anywhere in our galaxy. There is simply no benefit at all to doing that and in fact it usually ends up being detrimental as it absolutely destroys the selectivity turning the radio into a splatterbox which sees the signal you're trying to listen to being swamped by the one on the adjacent channel or nearby frequency. It was common here in the UK in the 70s and 80s to do to CBs what you do and it just wrecked them and made them unusable.

Selectivity of a HF transceiver is infinitely more important than selectivity because we've already got to the point where even a cheap $50 CB can hear below the noise floor of anywhere in our galaxy However when it comes to selectivity, the ability to hear a weak signal with a strong one nearby, there is a world of difference between various radios. That is where you need to be concentrating your efforts on.

Actually my radios do quite well at hearing stations way out in the distance while also hearing loud stations nearby without front end overload. Naturally a stronger station will drown a weaker station

 

[vkrules]

Thats not selectivity! What about strong station 5 or 10 kc away?

 

[vkrules]

I must say though sensitivity is very good on the 6666 and the maxlog variants but: as noted: to the decrement of the selectivity.

 

[M0GVZ]

Actually my radios do quite well at hearing stations way out in the distance while also hearing loud stations nearby without front end overload. Naturally a stronger station will drown a weaker station

You misunderstand. I'm not talking about how far away they are from you in distance, I'm talking about how near they are to you in frequency i.e if you're on 27.555 and they're on 27.560.

 

[M0GVZ]

I have no idea what that means

I'm going to make this simple in explanation before those who know a lot about this chime in. Yes I know its more than I'm saying but I'm trying to make a point as simply as I know how.

OK lets say a radio has a dynamic range of 60dB at 5kHz spacing to make things simple.

You are sat on 27.555 and there is a station on 27.560 which is a S9+20dB. What that dynamic range of 60dB at 5kHz means is you'd likely only be able to hear a station on 27.555 that was S3 or stronger when the station on 27.560 was transmitting. So you do your silly pointless mod and increase the sensitivity as you said which also reduces the dynamic range. Now you can only hear signals that are S4/5 or stronger on 27.555 whilst that station on 27.560 is keying up because you've made the selectivity worse.

As I said, dynamic range aka selectivity is more important than sensitivity because even the cheapest CBs can hear well below the noise floor.

 

[Yeti Communications Ltd]

any cb radio with a 10d4 filter (99% of the ssb 10.695 I.F staged C.B radios) is gonna be rubbish compared to a 600 buck + real ham radio transceiver even with a stock ssb filter in regards to dynamic range..thats where the sherwood test would "drop your jaw to the floor" and the super duper mod would look silly at the bottom of his list

however
Unless it has a filter cascaded after it (at the price of reduced sensitivity when engaged but that can be a good thing too therefore increasing dynamic range in doing so as well as selectivity)
or its changed for a narrower filter (expensive and kills the price point of the radio plus depending on the I.F strip can kill "good" audio on am and fm unless switchable to the wider filter on those modes...tripling the expense..two filters..board for them..redesigned mother board to incorporate switching )

the at6666..etc all use the 4khz filter(@60db down) on ssb as first entry point into the I.F strip

 

[Chop]

Anyone have a link to download the operators manual for the at6666?

 

[222DBFL]

A quick Google search came up with this.
http://www.cbradio.nl/anytone/Manual_Anytone_AT6666_ENG.pdf
Copy this link into your browser and it will bring you to the manual. Hope this helps.

 

[222DBFL]

And just in case here is the actual manual. See photos below.
Again, hope this helps or is what you are looking for. Good day.

 

[Chop]

Sorry to bump an old thread, but does anyone know the VR for the S/RF meter adjustment?

 

[davew41]

Does anyone know where to adjust the ssb frequency? I have a 6666 here that is about 1kc off on lsb

 

[PapaLima]

Who told you that? A lot of people use old cb radio, usually not in freqency. I used this radio at 5 years with no problems. You can go to menu and turn Your clarifier to Rx/Tx,then tune,but it's really not necessary. Radio is solid in freqency. Just my 2 cents

 

[davew41]

Who told you that? A lot of people use old cb radio, usually not in freqency. I used this radio at 5 years with no problems. You can go to menu and turn Your clarifier to Rx/Tx,then tune,but it's really not necessary. Radio is solid in freqency. Just my 2 cents

Who told me what?
I asked a question on how to adjust the frequency on lsb for the 6666 Because i can not find information or a schematic on this radio.
I have heard said radio on air, and have a 8 digit frequency counter it is low on LSb..
I just have no resources to make the fine adjustment without a service manual or schematic..
My other 6666 is dead on frequency no issues
instead of adding garbage to the thread can you provide the answer?
It does not appear you can

 

[w9cll]

Does anyone know where to adjust the ssb frequency? I have a 6666 here that is about 1kc off on lsb

How did you determine this? Are you saying it 1kc off what the display says?

 

[w9cll]

My other 6666 is dead on frequency no issues

It has a VFO no?