I tried a cheap laptop running Windows 10 with VARA FM Wide and an attenuated Digrig (v1.9) plugged into the DIN port on my V71A today using the Digirig cable with a green DIN plug). The VARA FM VU meter was pegged to the right even with the audio input (mic) set to 20% in the Windows sound control. Unfortunately the sound control only has a resolution of 20%.
Any advice? Would replacing the 100k attenuating resistor with something larger help?
Please check Digirig’s recording device settings and make sure the AGC is unchecked.
If that doesn’t work, please check the attenuator pads with the continuity tester to make sure they are not shorted.
Thank you! You taught me a humbling lesson. The AGC bit me in the rear end!
I was using the Digirig with another radio recently and all was okay. Today, I shifted to the USB port on the other side of my computer since I had a GPS antenna attached to the USB port that I usually connect the Digirig to. It just so happens that I tried using the Kenwood TM-V71A today for the first time too. I made the rookie mistake of being suckered into focussing on the big thing when it’s often the little details that trips one up.
which will adjust the input level -20dB. This requires opening the Digirig and cutting or soldering. ( I am not an expert in the Kenwood TM-V71A, but is there any way to reduce the level in the radio? I do not know about adjusting the level with resistors in the cable assembly, either.)
Thanks 73 C.
I looked at the DR135 schematic and service manual. There are no adjustments within the radio.
I already cut the jumper on the Digirig. I also tried adding 20K ohms (what I had on hand) in series with the input inside the DE-9. There is a slight improvement, so I’ll need to find a 100K resistor (total 200K in series) to bring it down to a reasonable level.