I'm nearly finished with the restoration of a Triton IV (544 digital). I hear a pulsing frequency marker at 14.0 MHz but my 544 manual makes no mention of it. It's definitely not a 25 kHz or 100 kHz
Thanks, Mike. I'll look into it. Paul, W9AC Unplug the the frequency display and see if the signal goes away. The signal is coming from that unit. Verify it first and the decouple the vcc going into
Mike, Interesting. If the 544 schematic is correct, the Display Board has no common +Vcc. +Vcc is supplied individually to each 7-segment LED module via Q14-Q19 (PNP) on the Logic Board. +Vcc on the
Mike, That's what confused me. I knew the 544 had no switched calibrator function but it sounds just like the calibrator in the analog Triton IV. Paul, W9AC that most likely was the calibrator, they
The trick is finding synthetic open gear grease that isn't prohibitively expensive. Today, I would not consider a PTO rebuild without synthetic grease. Otherwise, you're back to a rebuild at some poi
eliminate the slow noisy amplifier relay to allow solid state QSK switching of an external amplifier. See this link: http://omni6.wikidot.com/amp Paul, W9AC
IC-7610. The amplifier relay is keyed at all times. The only way to kill the relay is to rip it out. Steve's right. The relay must be extracted. Don't even think about it if you don't own a high-qua
And if that doesn't work, remove Plug 52. Plug 52 is engaging a CMOS 4066 quad bilateral switch. The switch is used to insert a constant level sidetone irrespective of the AF setting. Removing Plug 5
I may have misunderstood the issue. Re-reading, it sounds like the objection is actually mechanical relay noise, not audible clicks in the headphones. Paul, W9AC Try setting Menu 1, LCO to OFF 73 Bar
Here's a thorough explanation of the audio connector bonding problem from K9YC: http://www.audiosystemsgroup.com/Pin_1_Revisited.pdf The problem is ripe when circuit board sub-assemblies are used as
Unless it masks another problem, then it's a design issue for which I extend no forgiveness. There's no excuse for hiss, noise, or high-distortion levels in any receiver, especially those designed w
Completing the sentence should read: "Any compromise is flat-out sloppiness, often attributed to old design habits." Paul, W9AC Unless it masks another problem, then it's a design issue for which I e
not, you have no clue as to the minuscule magnitude of the issue." Thanks Bob, but I think I have a clue. People who actually know me (and my background) also think I have a clue. I regularly use hi
Bob, I would rather not post a brag sheet on my background in audio engineering. It's not necessary, nor helpful to make a point. My comment was posted as a general observation when using certain hea
Rick, It's more common and bothersome than you may think. In fact, the OP raised the issue, not me. You will find reports of high residual audio levels posted on eHam reviews. Moreover, it's often au
Rick & Bob, I should have stated from the beginning that I wasn't singling out the Argo VI. The eham reviews I'm referring to encompass many different brands and models, not specific to the Argo VI o
the output stabilizer pair of a 0.2uF and a 1-ohm resistor in series. I added the resistor." Good decision. That's a Zobel network on the output to stabilize the LM-383. The 383 often oscillates if
I'm a firm believer in synthetic grease - but the right synthetic grease. Look for Mobil 1 and Valvoline Synpower products. It's a light, almost fluffy grease with texture much like spackling compoun
Check with the folks at ICM crystals in Oklahoma City. They still maintain a list of crystals for classic rigs. Provide them with the transceiver model number and desired WARC bands of operation. ht