This moves the knee of the filter from 5.25mhz to 5.6 mhz. Units in the standard and Pro II are physically a little different, theĬircuit was the same.
The manuals and board layouts against each other, and while the filter He came up with a few capacitor changes to alter the upperĮnd of the filter response to fix the problem in the Pro II.
Some filter design software, and modeled the 80m filter to see where the Internet had the IC-756 Pro II and modified his for 60m coverage as Iĭid, and had the same problem with low output power. Matrix is setup to use the 80m low pass filter up to 6.0 mhz, where it When I first modified the processor, as I had seen numerous bits around the web for adding 60m, i t worked 'OK',īut would only put out about 50% power on 60m. It is desirable to have access to the 15khz filter to open up W2ENY mentioned to replace the 15khz filter in the 455khz I.F. After using the filter for about a year, I felt the need to make another change. EQUIPMENT: ICOM 756 PRO HF Transceiver (on hand) Horizontal Loop Antenna, 268 ft perimeter, up 30 feet (on hand) West Mountain Radio RIGBlaster PRO (2) (on hand, MSRP: 299.95) RMS Express Winlink 2000 (WL2K) radio email client.
But, its a a fairly simple matter to install a tap on the first IF (9 MHz) and use that signal to drive an SDR-IQ or LP-Pan with associated software for a superb panadaptor. It will show you that there are some strong signals on the band (or not) and thats about it. This is the filter the rig should haveĬome with from the factory, as all modes are well behaved, now. The built-in spectrum scope is very poor compared to, say, the Icom IC-756 Pro III. My 18 year old IC-756 is now perfect in my opinion, and everything is working great. I replaced theġ5khz filter in the 455khz I.F., and have noticed no issues with working FM on 10m, listening to broadcast stations, etc. I LOVE it! I've been working AM on 80, 40, and 15m with the 756 and have great selectivity on AM.
The instructions were EASY to follow and the mod was quick and
I received the 6khz AM filter from W2ENY for my IC-756. I work AM from time to time onġ60 thru 10, and usually operate one of my boatanchors due to the w-i-d-e passband on AM. I'm happy to have finally found one of these babies. I emailed him, he replied almost immediately that He has brought a limited number of these back for sale. I think he used to offer these, and went out of production for some Years, and just stumbled across a filter from W2ENY. I've been looking for an AM filter for my IC-756 for many I built a little one-off interface to take care of those keying duties, and enclosed it in a piece of clear heat shrink tubing, since it was dedicated to the IC-211 and was going to be installed behind that rig. The IC-211 SSB/CW rig has a goofy keying circuit that doesn't provide enough unkeyed voltage at the CW jack to allow switching by the 2N2222 transistor in the computer interface. 01uF cap to minimize key clicks, all in an old Radio Shack enclosure that was re-purposed from a previous project. A 3 position rotary switch, a pair of 1/4" phone jacks for the CW-Computer Interface and external keyer interface. The internals of the CW Keying Control are pretty simple. I discovered that I had to build a little interface for the IC-211, so I just enclosed it in shrink wrap and tossed it behind the rig.
No more plugging/unplugging cables when I switch rigs. This allows me to use my keyer, CW keyboard, and any straight key with any rig in the shack. I built a little CW Keying Control box in one evening, totally from junk box parts. I finally decided to do something about it. You should expect the Tx VFO dial frequency to change when you select different Tx audio offsets, this is normal behaviour.For some time, I've been wrestling with routing the CW-to-Computer Interface, the Straight Key, and the keyer to various rigs, depending on the rig/band I was working. This both allows you to transmit at any selected offset and also greatly attenuates any audio harmonics generated by overdrive of the transmitter's Tx audio circuits. Selecting on of the "Settings->Radio->Split Operating" options in WSJT-X allows the software to adjust your rig's Tx VFO dial frequency *and* the Tx audio tones to keep the tones within the optimal part of your transmitters bandwidth. Please explain what happens when you say "Otherwise the TX drops". I don't think there's anything similar reported here. Another observation is that although I determine on the radio the TX and RX frequencies for split, the radio changes to a frequency 0.50 below for the TX. I noticed that now I can only maintain the TX period using Split mode. Until a few months ago, I used it without Split and it worked very well. I use an old Icom IC-756PROII and WSJT-X for FT8. On 13:55, CLOVIS VONGHON via groups.io wrote: