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Author Topic: Listening fatigue IC 7300  (Read 2149 times)

K9IUQ

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Re: Listening fatigue IC 7300
« Reply #120 on: December 11, 2020, 05:59:43 AM »

The trouble with spending a lot of effort on an ultra-hifi ham radio setup is that it really is a waste of money

 - but the DX station is going to have his receive bandwidth set down to 2.5kHz and noise reduction cranked up, so he'll never know just what he is missing!

Martin (G8FXC)

Yep, the majority of those spending a lot of effort on Hi-Fi Hamradio sit on a 75mtr frequency talking to like minded hams. They talk for HOURS about how great their radios are, in fact aside from talking about their ham gear most of them are a loss for words. IOW all they want to talk about is how great and superior their 5khz plus bandwidth radios are. They LOVE to post pics on forums of their big tubed radios, big like their egos.

These same Hi-Fi Hams pooh pooh Dxers and Contesters, the Real Hams with headphones and a 2.4khz SSB wide signal OR using CW with a 100hz filter, both modes with NR,NB, NF and VC Tune cranked up on RX..

To each their own, hamradio is all about diversity.....

Stan K9IUQ
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N2DTS

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Re: Listening fatigue IC 7300
« Reply #121 on: December 11, 2020, 06:12:28 AM »

For some, ham radio is about radio and building and experimenting with it, or it was.
Now it seems to be more of you buy a radio and talk into it about political nonsense, or their current illness,
or whatever, some like to talk about radio and what makes it work.

You do not have to spend a lot of money for good audio.
Its dirt cheap now.
The Marantz I used I picked up at a fest 40 years ago at least, its solid state, about 25 watts per channel, has bass, mid and treble controls, 6 inputs, tape in and out, low and high cut filters, loudness control,
headphone output and speaker selection.
Its very handy to have besides sounding good.
I got it for $20.00.

I made a rackmount panel for it:


Guys will spend $4000.00 for a radio, and a LOT more for amps and towers and do nothing with the audio eh?

I am glad Icom has lowered the ACTUAL audio response (not what the filter says) in the newer radios.
Per the block diagram there was a high pass filter in the RX audio, a hardware filter I think.
The ones I had did not pass even down to 200 Hz  but they transmitted down to 100!
The new Kenwood transmits out to 4 KHz or more I hear, and the RX audio is very good they say, so one company is making improvements.

« Last Edit: December 11, 2020, 06:17:14 AM by N2DTS »
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AC7CW

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  • Posts: 1789
Re: Listening fatigue IC 7300
« Reply #122 on: December 11, 2020, 03:03:09 PM »

For some, ham radio is about radio and building and experimenting with it, or it was.
Now it seems to be more of you buy a radio and talk into it about political nonsense, or their current illness,
or whatever, some like to talk about radio and what makes it work.

You do not have to spend a lot of money for good audio.
Its dirt cheap now.
The Marantz I used I picked up at a fest 40 years ago at least, its solid state, about 25 watts per channel, has bass, mid and treble controls, 6 inputs, tape in and out, low and high cut filters, loudness control,
headphone output and speaker selection.
Its very handy to have besides sounding good.
I got it for $20.00.

I made a rackmount panel for it:


Guys will spend $4000.00 for a radio, and a LOT more for amps and towers and do nothing with the audio eh?

I am glad Icom has lowered the ACTUAL audio response (not what the filter says) in the newer radios.
Per the block diagram there was a high pass filter in the RX audio, a hardware filter I think.
The ones I had did not pass even down to 200 Hz  but they transmitted down to 100!
The new Kenwood transmits out to 4 KHz or more I hear, and the RX audio is very good they say, so one company is making improvements.

If one has a radio with an IF in the broadcast band an external antenna from a hifi can be brought into the rig and the if can be tuned to. I did that with a BC-348 and it really was a quick and dirty way to have great audio.
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Novice 1958, 20WPM Extra now... (and get off my lawn)

N2DTS

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Re: Listening fatigue IC 7300
« Reply #123 on: December 11, 2020, 05:15:26 PM »

That is clever!
You can take the IF out of some radios and put them into a cheap sdr and get great filters and audio.
The 7300 does not have an IF out from memory as its a direct sample radio from memory.
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VE3WGO

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Re: Listening fatigue IC 7300
« Reply #124 on: December 12, 2020, 09:38:59 AM »

the radios must be using similar amplifiers that pc's are using, after all, neither is geared toward audiophiles, and low cost is the main objective for both, so the differences must lie elsewhere.  It makes me wonder if those radios that have listener fatigue are using poor quality ssb product detectors, either in software or in hardware?

73, Ed
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WB8LBZ

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Re: Listening fatigue IC 7300
« Reply #125 on: December 12, 2020, 11:42:04 AM »

There is an aftermarket kit for the 7300 that gives you a coax connecter to the back of the radio for your SDR. I don't recall who makes it but I have seen it mentioned in forums. I bought a 7610 instead and did not pursue learning anything further about this.

73, Larry  WB8LBZ
El Paso, TX
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G8FXC

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Re: Listening fatigue IC 7300
« Reply #126 on: December 12, 2020, 11:48:27 AM »

There is an aftermarket kit for the 7300 that gives you a coax connecter to the back of the radio for your SDR. I don't recall who makes it but I have seen it mentioned in forums. I bought a 7610 instead and did not pursue learning anything further about this.

73, Larry  WB8LBZ
El Paso, TX

PTRX-7300 - very nicely designed accessory - I have one in my 7300 and it is excellent. There are two manufacturers - Radio Analogue and Radio Spectral - the relationship between the two is a bit unclear. The device was originally marketed by Radio Analogue, then Radio Spectral came along offering an extremely similar design by the same name. Each now accuses the other of piracy! Mine is a Radio Analogue version and is very well made.

Martin (G8FXC)
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N2DTS

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Re: Listening fatigue IC 7300
« Reply #127 on: December 12, 2020, 08:30:27 PM »

What is the frequency of the IF output?
I thought the add on thing was an RX antenna port...


There is an aftermarket kit for the 7300 that gives you a coax connecter to the back of the radio for your SDR. I don't recall who makes it but I have seen it mentioned in forums. I bought a 7610 instead and did not pursue learning anything further about this.

73, Larry  WB8LBZ
El Paso, TX
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N5PG

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Re: Listening fatigue IC 7300
« Reply #128 on: December 12, 2020, 08:36:41 PM »

https://www.dxengineering.com/parts/log-ptrx-7300

Also listed on Amazon.

The add-on second antenna socket is made by Inrad: https://www.inrad.net/product.php?productid=371&cat=181
« Last Edit: December 12, 2020, 08:38:57 PM by N5PG »
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G8FXC

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Re: Listening fatigue IC 7300
« Reply #129 on: December 13, 2020, 05:26:17 AM »

What is the frequency of the IF output?
I thought the add on thing was an RX antenna port...
...

It is - it provides a tap into the RF chain which offers protection from the transmit output for the SDR. The MFJ switch provides a comparable function but, being external, it has to be able to cope with the full output power of the rig on transmit. The PTRX7300 taps into the low level signal inside the rig. As well as being less vulnerable to component failure, this also provides a controlled sample of the transmitted signal into the SDR for processing.

Martin (G8FXC)
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