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****HRHG Bi-Weekly Group Statement - Mon, 12/28/2020
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main@HamRadioHelp.groups.io Calendar <noreply@...>
****HRHG Bi-Weekly Group Statement When: Description:
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Digital VHF/UHF radios DStar, DMR, or Fusion
Donald Hellen
I have a DStar radio (Icom 5100) but I'm not a fan of DStar. It's not
easy to set up and if I don't use it for a while, I've forgotten how to get it working again. A local ham said DMR is the fastest growing type of digital radio in the US. I'm thinking of buying an Anytone 868 or 878 radio. I first want to find out if we're moving toward more DMR repeaters across the country or not. We have only one such repeater nearby within range. Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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Re: Looking for a circuit design for bandpass active audio filter
Donald Hellen
On Sat, 26 Dec 2020 08:30:55 -0500, "Richard in NC via groups.io"
<w4mcd=yahoo.com@groups.io> wrote: Have you looked at a Autek QF-1 audio filter? This is probably close to what might work. Instead of using a high pass and a low pass filter together it has a variable selectivity pot to widen or narrow the bandwidth. I think I can make a better one with steeper slopes but I'll have to read about this one some. I could mount this inside the speaker enclosure and move the controls to the front panel, then add holes for the two toggle switches. It could be made to work. I'll have to decide if I want to roll my own and have that feel-good feeling of doing it myself or buying one. Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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Re: Looking for a circuit design for bandpass active audio filter
Donald Hellen
Thanks.
That would probably do it but it's not just the board, it's a kit with the enclosure, and I'd be paying for a nice enclosure that I wouldn't be able to use. I'd like to see his circuit though. If I'm going to use anything ready-made or in a kit, I would want a board-only device, with no enclosure. I think one of the common ham radio band pass filter circuit diagrams I found would work, using one or two 741 IC op amps. I have some quad op amps handy, and probably some 741C's as well. Donald -- AD8DY Formerly KJ3I On Fri, 25 Dec 2020 22:44:15 -0700, "Mike Reed" <n7zef@tribcsp.com> wrote: Did some searching and found the site I mentioned- ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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Re: Looking for a circuit design for bandpass active audio filter
Have you looked at a Autek QF-1 audio filter? I have one that I have owned for 30+ years. All solid state and work great. There are several of eBay right now for around $40. Time wave DSP-9 is a great audio filter as well and there is one of these on eBay right now as well. Autek filters are variable but the Wavetek I think is better for contesting. I have the QF-1A which added some features. I don't remember exactly what as I did not ever own the QF-1 version. Hope this helps 73 Richard W4MCD
On December 26, 2020 7:41:11 AM "Mike Reed" <n7zef@...> wrote:
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Re: Looking for a circuit design for bandpass active audio filter
Mike Reed
Did some searching and found the site I mentioned-
toggle quoted messageShow quoted text
https://kc9on.com/product/calf-cw-audio-limiter-filter/ Maybe that may help. And the Vectronics kit I also was thinking about is the VEC-841k CW/SSB . It is out of production but maybe you can find something there too... 73 Mike - N7ZEF
On Fri, 25 Dec 2020 20:27:37 -0700, Donald Hellen <donhellen@roadrunner.com> wrote:
Mike . . . --
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Re: Looking for a circuit design for bandpass active audio filter
Mike Reed
There was a kit that had the capability of user adjusted band pass . It was switchable. I built one, works well.
toggle quoted messageShow quoted text
I think if you search on eBay for the "CALF filter kit" it might be what you want. I don't have the stuff right now where I can get to it, possibly a search may find it. 73 Mike - N7ZEF
On Fri, 25 Dec 2020 20:27:37 -0700, Donald Hellen <donhellen@roadrunner.com> wrote:
Mike . . . --
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Re: Looking for a circuit design for bandpass active audio filter
Donald Hellen
Mike . . .
On Fri, 25 Dec 2020 18:53:36 -0700, "Mike Reed" <n7zef@tribcsp.com> wrote:
That would not be dual-purpose and wouldn't work for CW. I'm looking for a bandpass filter that is something like this circuit or a multi stage one that has a sharper cutoff: https://www.electronics-tutorials.ws/filter/filter_7.html or this one: https://www.electronicshub.org/active-band-pass-filter/ or done in 2 stages with a low pass then a high pass or vice-versa like this: https://www.instructables.com/Active-Band-Pass-Filters/ It would have multiple selections on a switch for R1 and R2 (instead of a single value for each) to change the cutoff frequencies on both the high and low end. Maybe 2 or 3 for CW and 2 for SSB or vice-versa. I don't have much experience with home brewed circuits but I dabbled a bit when I was a kid. I made a power supply for a cassette tape recorder from some spare parts, and an electronic mosquito repeller back around 1970-73. But I have the parts, a great soldering station (and a hot air rework and soldering station also), and some breadboards so I could assemble this with the dead bug type of layout (upside down ICs look like a dead bug sort of). But, if there was a ready made board that did the same thing at a decent price, I might spare myself the time and just make modifications to it, running wires from the two control resistors that determine the cutoff frequencies to either two potentiometers (for the high and low end), or two multi-pole rotating switches that would let me select the pre-set cutoff frequencies. I have the holes in the speaker enclosure because there are RF gain and AF gain controls that could feed back to the radio if they were still connected. Right now, the audio input goes directly to the speaker. I want to take advantage of the room inside the speaker enclosure to add the selectable bandpass filter that would work for CW or SSB. If it was just one or the other, and if I didn't need to be able to change the bandpass cutoffs on the high and low end even for those, I would just use a preset filter board. Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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Re: Looking for a circuit design for bandpass active audio filter
Mike Reed
There is one. Try "VEC-830 SSB Filter" I have one, but have not had the chance to try it.
toggle quoted messageShow quoted text
73 Mike - N7ZEF
On Fri, 25 Dec 2020 07:48:09 -0700, Donald Hellen <donhellen@roadrunner.com> wrote:
On Fri, 25 Dec 2020 12:26:41 +0000 (UTC), "ka0kaf@bellsouth.net" --
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Substitute for Ameritron ARB-74 amp interface
Donald Hellen
Though this is a "repair" forum, I thought this might also be
appropriate to post here, especially since it's not a busy place at the moment. I decided to put some protection between my 7300 and my amplifier, and Ameritron 811H, for the sake of the 7300, not for the sake of the amplifier. I was reading an article by a ham here: https://kv5r.com/ham-radio/2018-projects/amp-interface/ and wondered if this SSR (solid state relay) might do the trick (see below). It has all the connections protected and would look a little nicer for about the same price as the SSR he used and the other one he recommended. https://www.ebay.com/itm/Solid-State-Relay-SSR-DC-DC-10A-3-32VDC-5-220VDC-10A-for-Crydom-D1D12-D2D12/154032897347 If it would work, I'm just a bit confused about the interconnections. I know the #3 and #4 terminal faces the 7300, and the #1 and #2 face the amplifier. Is the center conductor of [SEND] positive and the center conductor on the Ameritron also positive? Or do I need to provide 12V (or some other voltage) to operate the SSR through the 7300's [SEND] jack? As I understand it, each time the amp is energized, the SEND line needs to ground the amp's send jack. As for the ALC line, it looks like it's just a plain RCA to RCA plug cable. If I understand it correctly, I can also just cut an RCA to RCE plug cable in half and wire it to this SSR and I'll have the essentials of an amplifier interface. I just want to check before ordering the item. I think it will sink more current than the Crydom DMO063 or Crydom MPDCD3. I'm not concerned about it being bigger as it will be plenty smaller than the ARB-704 interface. Your thoughts? Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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Re: FT-767GX front panel reassembly
Hoyt
I've not done it, but maybe just a dab of super glue to hold stuff in place before assembly?
Hoyt n2jdk
-----Original Message-----
From: Donald Hellen <donhellen@...> To: main@HamRadioHelp.groups.io Sent: Fri, Dec 25, 2020 10:35 am Subject: [HamRadioHelp] FT-767GX front panel reassembly I received an assortment of tactile switches so I can now replace the
power/SWR switch button behind the panel on the RH side of my 767.
I understand that putting it back together is a chore, getting the
buttons all lined up with the switches and keeping the buttons from
falling out, etc.
Is there a good way to reassemble the radio once I've replaced that
switch?
Thanks!
Donald -- AD8DY
Formerly KJ3I
----------------------------------------------------
Some ham radio groups you may be interested in:
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Re: 7300 with Ameritron 811H amplifier
Donald Hellen
On Fri, 25 Dec 2020 06:25:30 -0800 (PST), "Gil Drynan"
<gild@seanet.com> wrote:
Gil, Thanks. I thought I replied to this but I don't see my reply, and I didn't put myself on moderation, so either GIO is having issues or I killed the message on my end by mistake. I grew up with tube equipment so switching bands and tuning for each is not unusual to me. I'll have to do that on the Johnson Ranger I have waiting to restore it. I'll have to see if the 10 meter option was installed but if not, it should be a simple thing to do. It covers even the WARC bands, and the 10M position says "AUX" so there's a place for 10M. I'm not a 10M fan but I would like to try it with the amp sometime. Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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FT-767GX front panel reassembly
Donald Hellen
I received an assortment of tactile switches so I can now replace the
power/SWR switch button behind the panel on the RH side of my 767. I understand that putting it back together is a chore, getting the buttons all lined up with the switches and keeping the buttons from falling out, etc. Is there a good way to reassemble the radio once I've replaced that switch? Thanks! Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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Re: 7300 with Ameritron 811H amplifier
Gil Drynan
You'll do fine on the 7300, but you have to switch bands manually on the amp.
toggle quoted messageShow quoted text
gil W7GIL
Is setting a transmitter delay enough to have my 7300 work with my
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Re: Looking for a circuit design for bandpass active audio filter
Donald Hellen
On Fri, 25 Dec 2020 12:26:41 +0000 (UTC), "ka0kaf@bellsouth.net"
<ka0kaf@bellsouth.net> wrote: I do not know if the kit from Vectronics would solve what you are looking but it may be worth a try.Thanks, but if it's the ones on the MFJ web site, it's a CW only filter. I was hoping to set up something that would cut the SSB bandwidth as well as CW, possibly one with tuneable starting points for the slope of the filter. It also comes with an enclosure and I'd want to build it into the speaker enclosure. So I'd be paying for an enclosure. I think a simple active filter for this could be made with some 741 op amps and a few other components. My 7300 would do just fine but my older radios would benefit from a decent audio filter. I appreciate you mentioning this though. Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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Re: Looking for a circuit design for bandpass active audio filter
ka0kaf@bellsouth.net
I do not know if the kit from Vectronics would solve what you are looking but it may be worth a try. 73
On Thursday, December 24, 2020, 10:07:38 PM EST, Donald Hellen <donhellen@...> wrote:
I think what I called it in the subject line is what I'm looking for. I want to build an active audio filter that will have the ability to cut the high end and the low end of the audio from a ham radio receiver with switchable cutoff points, so that I can tailor the audio based on band conditions. My speaker enclosure has room inside to add such a device and two knobs on the front panel (audio volume and RF gain that can be connected back to a Yaesu radio) that can either be replaced with pots or switches to change the high-cut and low-cut parts of the audio signal. I thought I'd use the existing pots or change them to 3 or 4 position switches to allow switchable (or tuneable) bandpass cutoff points. Sort of a very simple 1 band equalizer. If there's a ready-made kit for something like this I might be interested, but hand-crafting such a device is OK also. I would like to keep the cost low (like most of us try to do). I want to use active components like op-amps along with resistors and capacitors, and hopefully be able to run this off a wall wart type of power supply once I either find one that's not noisy for RF or that I can tailor to make it so. If I can't find that, I can find tap 12V from my power supply as a power source since it's quiet (that may be the best approach). I can add a one or two watt (or more if needed) audio amplifier after the filter if needed to make the audio level suitable to my ears. I think the LM386 can make a decent low power amp. Your ideas? Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in:
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Looking for a circuit design for bandpass active audio filter
Donald Hellen
I think what I called it in the subject line is what I'm looking for.
I want to build an active audio filter that will have the ability to cut the high end and the low end of the audio from a ham radio receiver with switchable cutoff points, so that I can tailor the audio based on band conditions. My speaker enclosure has room inside to add such a device and two knobs on the front panel (audio volume and RF gain that can be connected back to a Yaesu radio) that can either be replaced with pots or switches to change the high-cut and low-cut parts of the audio signal. I thought I'd use the existing pots or change them to 3 or 4 position switches to allow switchable (or tuneable) bandpass cutoff points. Sort of a very simple 1 band equalizer. If there's a ready-made kit for something like this I might be interested, but hand-crafting such a device is OK also. I would like to keep the cost low (like most of us try to do). I want to use active components like op-amps along with resistors and capacitors, and hopefully be able to run this off a wall wart type of power supply once I either find one that's not noisy for RF or that I can tailor to make it so. If I can't find that, I can find tap 12V from my power supply as a power source since it's quiet (that may be the best approach). I can add a one or two watt (or more if needed) audio amplifier after the filter if needed to make the audio level suitable to my ears. I think the LM386 can make a decent low power amp. Your ideas? Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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7300 with Ameritron 811H amplifier
Donald Hellen
Is setting a transmitter delay enough to have my 7300 work with my
Ameritron 811H amplifier or do I absolutely need an interface? If the radio can work with the amp using a simple cable with RCA phono plugs on each end what is the setting I need to set in the menus on the 7300? I know MFJ and others offer an interface, but just because they sell one doesn't necessarily mean I need one for this setup. Thanks in advance. Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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****HRHG Bi-Weekly Group Statement - Mon, 12/14/2020
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main@HamRadioHelp.groups.io Calendar <noreply@...>
****HRHG Bi-Weekly Group Statement When: Description:
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The G3NRW IC-7300 Resources Page
Donald Hellen
Someone posted this in the Icom 7300 FB group and I thought it might
be useful to some here. http://g3nrw.net/IC-7300/ main page http://g3nrw.net/IC-7300/?page_id=323 software page for digital modes, radio control, etc. Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: https://groups.io/g/ICOM https://groups.io/g/Ham-Antennas https://groups.io/g/HamRadioHelp https://groups.io/g/Baofeng https://groups.io/g/CHIRP https://rf-amplifiers.groups.io/g/main
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