Subtle! Well done, not an easy thing to find! The weird part is that I checked the ladder line several times with a field strength meter and did not get a higher reading. The highest reading was up against the ground strap coming into the shack ( also have a knife switch on the ground so I can isol...

Just an update on what the problem was and how it was corrected. It was an RFI problem, 10 meters was coming back into the shack via the 600 ohm ladder line from the 160 meter doublet. When I disconnected the ladder line outside the house instead of just using the double knife switch inside the shac...

On the OC output for the pin I select, say 7, If I select TUNE on the drop down, on transmit using the TUN button in Thetis , pin 7 will go to ground and sink the voltage that was on pin 7 at the amp side to close to zero volts? Is that correct? Also what is keeping pins 1-4 from going to ground wi...

Just wanted to let everyone know you can control the MFJ-998 from the OC outputs. The tuner side is an ethernet plug. If you put the tuner in Kenwood mode and pull the right 2 wires to ground, and send tuning power, the tuner will run a tune cycle. Easy peasy. I forgot to write down the pins, but i...

Has nothing to do with the PTT bypass on the 998. I have configured the OC's to only assert pin 6 when depressing TUN. Pin 6 and ground is connected to a pin on the MFJ-998 interface cable (I just used a basic ethernet cable and cut the end off), I can't remember exactly which but you can test and ...

With a lot of the auto tuners in combination with the open collector outputs on the anan, it can be made to work. I just got this working with my MFJ-998. Wherever I QSY to on the anan, I click TUN which sends 10w and initiates a tuning cycle on the tuner by asserting Pin 6 (TUN only). Then, if I n...

It now looks like it may be an RFI issue with the ANAN. I had a bunch of chokes on the antenna coax coming into the shack. I took them off and put them on the coax on the radio and the issue appears to be gone. It was worse on the low part of 10 meters intermittent on the mid section of 10 meters an...

I also had problems measuring SWR and reflected power. Even when setting the minimum output power, it showed 0.3W reflected. And did not change the value when the output increased. The converter ADC78H90CIMT (U17) did not work properly. Chip heating 92°C(197.6°F). Although FWD displayed correctly. ...

laurencebarker wrote:It also goes through a potentiometer on the RF board, that may not be set correctly

I will look at that too thanks

Alex A wrote:Have you checked the signals coming to ADC78H90CIMT (U17) FWD PWR and REW PWR (J15)?
After establishing the presence of adequate voltage levels, it will be clear whether this is a hardware or software problem ....

I will see if I can do that, thanks

Just seeing the replies now, somehow I lost this thread.

I think I had the same thing. I had to change the filter size RX and TX on SSB/AM at DSP.Options to 4096 to get rid of that out of pass band spikes. I had 2 spikes above and below the band pass, Setting 100 hz as the bottom got rid of both. But to have a 50 hz bottom, I had to change the filter size...

I was able to stop this problem by changing the LPF filter for 10m to the bottom of the 10m band at 28.000 instead of the default of 24.000. I guess that filters out the 11 meter signal that for some reason the radio is producing when in 10 meters. The settings in BPF1/LPF (and BPF2) do not change ...

I don't know if there is a hardware issue with my radio or if it is a particular issue with the ALS-1306 but just letting everyone know how I either fixed or compensated for a 10 meter transmit issue with the 700DLE MKII and the ALS-1306 The amp has a function that if it sees too much 11 meter signa...

Looking at the schematic, the radio employs a directional bridge to isolate Forward power voltage and Reverse power voltage using 2 op amps on the same LMR348 chip and then that voltage travels by cable to the processor. So it could be anything from a poorly seated cable to a diode, to a cap, or tra...

Here are the numbers All power was set on the dummy load to 10 watts via the MFJ-891 Meter. The antenna is a fan dipole with wires for 80/40/20/10 meters. I also tune it to all bands 80-10 using the MFJ -998 Autotuner I first checked the antenna at the freqs with theMFJ-259C Analyzer to check SWR FP...

w9mdb wrote:Can you please quantify those values...."very low" doesn't show that detail.

I will post some numbers.

I also re-installed an old Thetis, same results.

Have you looked at Ref Pwr on the Thetis meter? What does for Fwd and Ref Pwr show? yes forward power corresponds to forward power on the MFJ meter reflected power is very low compared to the MFJ meter I think the problem is the radio is not measuring reflected power properly or the phase angle to ...

maybe it is not an op amp

doesnt there need to be an internal coupler to sample the forward and reverse power?

I will look to see if I can find one on the circuit diagrams

Let me ask your setup. Are you using an SWR/power meter between the tuner & antenna? If so, that is the wrong place to read SWR. Try each band directly to the dummy load & see what the radio reads on all bands. Ed The meter is between the amp and the tuner it would never show swr change due...

Thanks for finding that The likely problem is an the opamp or something else inline with the opamp that brings the signal to the input or biases the opamp. This is now a hardware problem and I started a thread in the repair section. https://community.apache-labs.com/viewtopic.php?f=43&t=4691

I have a thread in the Thetis subforum but now believe I have a hardware issue. The Reverse power measuring is unrealistically low producing an SWR that is much lower than the actual SWR. The circuit diagram shows the Reverse Power goes through an opamp, so this is very likely a hardware issue that ...

Update: The SWR is broken on all bands. I never noticed because I use an autotuner and the autotuner does it's thing fast. The autotuner is not a 6 meter tuner so I was trying to use the 160 meter doublet to tune to 6 meters and noticed before I even manually tuned (it is a modified Johnson Kilowatt...

I'd like to add to Ed's comment......and also answer your question, It is always good practice to use a dummy load for technical and practical reasons. 1) If you add a 50 ohm dummy load, take a reading and the problem remains? What does that mean?......or if the problem is eliminated? Don't forget,...

Phrotus wrote:May I suggest that you use a dummy load for issues such as this in order to take more variables out of the 'equation'.

Tom
W4TMW

Well the dummy load has a very low SWR by nature.

So I am not following on how that will help.

May I suggest that you use a dummy load for issues such as this in order to take more variables out of the 'equation'. Tom W4TMW Please excuse my ignorance. How might a dummy load help him isolate the difference between three SWR readings, where one is presumed erroneously low? OP: No idea but in f...

on noise level and on a received signal the difference between the 6m RX LNA on and off is 6 db.

Does that sound about right or is there maybe a problem with the 6m LNA?

I am getting a 1.3 SWR on 6 meters when the antenna shows 2.4 SWR. All the other bands work well. But on 6 meters, I get no more than 1.3 SWR when it is confirmed by another radio and an antenna analyzer to be 2.4 and actually higher at higher power setting using another radio. The SWR warning does ...

That did it Mark. That made a big difference. It is the SSB Filter size. Mine was 1024. I made it 4096 and it looks much better with a steep rolloff below the low transmit filter hertz I have been looking for some type of setting to change the transmit filter db roll off and could not find anything....

Has anybody seen this or know what the issue could be? My radio 7000DLE MKII is transmitting outside the SSB transmission bandwidth ABOVE the selected frequency. You will see on the pics that the selected freq is 3.940 LSB and I am transmitting out to 3.942 into the USB spectrum. It shows up on my d...