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swr with al811xce 10 m band
- Thread starter ahasverus
- Start date
See AL-811 Manual in regards to adjustment of input tuning...Each band has a "tune" slug to adjust VSWR between radio and amp...
Make sure your auto tuner in the FTdx1200 is OFF...This also will affect the input tuning.
All the Best
Gary/W9FNB
Make sure your auto tuner in the FTdx1200 is OFF...This also will affect the input tuning.
All the Best
Gary/W9FNB
Maybe I misunderstood...the AL-811x (EXport model) should have 10 meters already enabled...
Do you not have a 10m position on the amplifier band switch? Possible marked AUX or maybe not even shown...should be another "CLICK" (clockwise from 15/17m position) Either way it should work...If this is not a TRUE Export version and is a stateside model a slight modification to bandswitch is all that is required.
All the Best
Gary
Do you not have a 10m position on the amplifier band switch? Possible marked AUX or maybe not even shown...should be another "CLICK" (clockwise from 15/17m position) Either way it should work...If this is not a TRUE Export version and is a stateside model a slight modification to bandswitch is all that is required.
All the Best
Gary
I am confused as to what it is you are trying to do. It also appears something is being lost in translation.
Where are you measuring the SWR? Between the radio and the amplifier or between the amplifier and the antenna?
Are you only using one antenna and what band is it for?
Are you trying to operate several bands on only one antenna?
If you only want to operate 10m you are fine. You said "amp off gives 1 ,1 on 10 m band dipole/ft 1200dx/". When the amp is OFF then the radio will see the antenna SWR directly. It appears that your antenna is fine for 10m. Tune the amplifier on the 10m position and you should be fine. If the SWR between the radio and the amplifier is high when the amp is on then you need to adjust the input tuning for 10m which is labeled AUX on the rear of the amp.
Gary, the poster is in Belgium and his amp is an AL-811XCE. The "X" indicates it is an export model with 10m included and the "CE" means it has CE certification for sales and use in Europe which has different standards.
http://www.dxengineering.com/parts/ame-al-811xce
The way I read it was he has low swr on 10m into a 10 dipole of some sort with the amp turned off. What I don't get is the second part about turning the amp on and changing the band switch to 20 and then 17/15 meters and getting high swr. Hmmmm low swr on 10 and acceptable on 20 sounds like he's using a G5RV. If so he's going to need a tuner AFTER the amp. The tuner in the Yaesu isn't going to do a thing about the match after the amp.
OP needs to detail his setup for us to have a shot at the correct answer to his problem.
OP needs to detail his setup for us to have a shot at the correct answer to his problem.
That's why I wanted to know where he was reading the SWR at. If he was using a G5RV he should see good SWR on 20m and acceptable (maybe) on 10m since the G5RV was originally intended as a 20m monobander. It just happened to work on other bands as well with a little work. That is all moot anyway since the OP stated (I believe) he is using a 10m dipole and wants to use the amp on 10m.
Yes: I know he is in Belgium...it's Marcel he's and ON3...but I yes believe I missed something, specifically where this VSWR problem is occurring....
Radio to Amp?...Amp to Antenna?...
And Yes I know the X means export/240vac but, this is MFJ's QC we are talking about!
Trust nothing there!
Yes Marcel and I chatted before in regards to this amplifier and his keying cable, and through the process we resolved his issue.
Still just trying to help.
I've own that same amp for like 15 years , better pretty much been through it a time or 2...
Marcel: Help us out, a little more detail please.
All the Best
Gary
Radio to Amp?...Amp to Antenna?...
And Yes I know the X means export/240vac but, this is MFJ's QC we are talking about!
Trust nothing there!
Yes Marcel and I chatted before in regards to this amplifier and his keying cable, and through the process we resolved his issue.
Still just trying to help.
I've own that same amp for like 15 years , better pretty much been through it a time or 2...
Marcel: Help us out, a little more detail please.
All the Best
Gary
OK Gary....just from your post it looked as if you were questioning what specific model of the 811 series he had. It would appear that the OP needs a little more understanding of how to run an amp......any amp....but that's what we are here for. To help him. Wed just need a bit more info.
i like to thank everyone who gives me an answer to solve my problem
i see i was too brief in my question
so "again for me"
when using the ft1200dx without ampli switched on on the 10 m band using a dipole the swr is 1.1
When switching the ampli on and the switch to 17/15 (on the ampli)as i see no 10 but as well a switch ( aux)
i don't know the use as the manual don't mentioned it
with 17/15 and adjusting the plate/ load -as written in the manual) the meters on the plate/ load move hardly
and the swr is 5
I put a tuner (tx-ampli -tuner -antenna)
but no result
perhaps of the working of the automatical tuner within the tx
as i read in the answers
-switch of the tuner in the tx-
-cut the green wire (think inside )!
-use the aux switch
the tx measures the swr with ampli hooked on
indeed i put already a question about the relay on the all-811
i solved the problem with your help
(the cable tx-ampli i received was a cat-cable)
when i rewired it and put the right pins on the right
input on the tx ground :ground i was "saved"
thank you for your attention and further reply on3bm on qrz.com
i see i was too brief in my question
so "again for me"
when using the ft1200dx without ampli switched on on the 10 m band using a dipole the swr is 1.1
When switching the ampli on and the switch to 17/15 (on the ampli)as i see no 10 but as well a switch ( aux)
i don't know the use as the manual don't mentioned it
with 17/15 and adjusting the plate/ load -as written in the manual) the meters on the plate/ load move hardly
and the swr is 5
I put a tuner (tx-ampli -tuner -antenna)
but no result
perhaps of the working of the automatical tuner within the tx
as i read in the answers
-switch of the tuner in the tx-
-cut the green wire (think inside )!
-use the aux switch
the tx measures the swr with ampli hooked on
indeed i put already a question about the relay on the all-811
i solved the problem with your help
(the cable tx-ampli i received was a cat-cable)
when i rewired it and put the right pins on the right
input on the tx ground :ground i was "saved"
thank you for your attention and further reply on3bm on qrz.com
Marcel: Good Day to you.
The AUX position on the amplifier should be your 10m band . Hopefully the factory "enabled" that correctly before shipment.
Try that position for use on 10m, load and tune as you would using the other bands.
This should work for you, if not we are here to help.
All the Best
Gary/W9FNB
The AUX position on the amplifier should be your 10m band . Hopefully the factory "enabled" that correctly before shipment.
Try that position for use on 10m, load and tune as you would using the other bands.
This should work for you, if not we are here to help.
All the Best
Gary/W9FNB
Yup....it always helps if both the radio and the amplifier are tuned to the same band that you want to operate on. The AUX bandswitch position is for both 10m and 12m by the way.
