TRX-1 terrible at Analogue? Or is it me?

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Broken_Antenna
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TRX-1 terrible at Analogue? Or is it me?

Post by Broken_Antenna »

Firstli.. I really don't like going onto forums for help if I can help it. But this has got me stumped.

So, I have a Netset 2032 Analogue scanner which was given to me about 2 years ago (Completely reset) I scanned and I found some frequencies. My clever Idea or not was to scan with the Netset until I heard something and then program it into the TRX-1, well, I have a frequency fairly active (local Hospis) but the TRX-1 will not pick it up, I have tried every combination that I think is possible, Squelch search on and off, Excluded DMR and NXDN. I have tried Auto DX mode and Auto RX mode and every combination they have to offer and the TRX-1 still refuses to pick up the analogue frequency. Just a note that I have entered the frequency in as a Conv frequency the same as I did for a lot of my other frequencies in the TRX-1.

Has anyone got any ideas on why this is happening? Thanks for any help that is provided.
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Andy
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Re: TRX-1 terrible at Analogue? Or is it me?

Post by Andy »

What is the frequency? It may be a spurious response in your Netset, in which case the TRX-1 won't hear it.
EDIT. It looks like the 2032 has a first IF of 10.7 MHz, so the image response would be 21.4 MHz above or below the indicated frequency. Does the transmission you are hearing seem out of place (eg airport comms at 434 MHz or 477 MHz)?
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Re: TRX-1 terrible at Analogue? Or is it me?

Post by Broken_Antenna »

Thanks for replying.

The frequency is 474.725 which does seem odd because I used to here the same hospis on 453.350 but it is much much clearer on 474.725 than it was on 453.350 and come to think of it I don't hear anything on 453.350 anymore so I thought maybe they had moved frequencies which seems a bit strange considering they are still using analogue and nothing else has changed, same call signs, same little jobs etc etc.
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Re: TRX-1 terrible at Analogue? Or is it me?

Post by jhampton2000 »

474.725 will be a harmonic, the image of 453.3250 + 21.4MHz as Andy points out.
You quote 453.3500 so I think you have that logged incorrectly (should be 453.325) or else the harmonic you quote is wrong (is it 474.725 or 474.7500?). Either way use the 453.x freq in your TRX1
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Re: TRX-1 terrible at Analogue? Or is it me?

Post by Andy »

It's worth learning the band allocations to spot things like this. Anything above 470 MHz (up to around 800 MHz) is TV broadcast and you shouldn't be hearing voice stuff there. If you do, subtract 21.400 from the indicated frequency and listen there instead.
I'm surprised that the 2032 uses such a low first IF as it is asking for image problems, especially at UHF. Most scanners use a high IF, somewhere between 200 and 700 MHz to get around this effect.
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Re: TRX-1 terrible at Analogue? Or is it me?

Post by Broken_Antenna »

jhampton2000 wrote: 01 Jun 2021, 18:27 474.725 will be a harmonic, the image of 453.3250 + 21.4MHz as Andy points out.
You quote 453.3500 so I think you have that logged incorrectly (should be 453.325) or else the harmonic you quote is wrong (is it 474.725 or 474.7500?). Either way use the 453.x freq in your TRX1
Thank you for replying, yes, you are right I had the frequency wrong and it should be 453.3250. I had no idea that happened at +21.4MHz. I can't remember it happening when I had the Realistic 2042 by Radioshack back in the day. Your help is much appreciated.
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Re: TRX-1 terrible at Analogue? Or is it me?

Post by Broken_Antenna »

Andy wrote: 02 Jun 2021, 07:57 It's worth learning the band allocations to spot things like this. Anything above 470 MHz (up to around 800 MHz) is TV broadcast and you shouldn't be hearing voice stuff there. If you do, subtract 21.400 from the indicated frequency and listen there instead.
I'm surprised that the 2032 uses such a low first IF as it is asking for image problems, especially at UHF. Most scanners use a high IF, somewhere between 200 and 700 MHz to get around this effect.
Thank you for taking the time to reply, I used to know the band allocations but I have been out of the hobby for 20+ years which is unfortunate. I used to love the Realistic Pro 2042 because it was my first Radio Scanner and it was awesome for the time, I had no problems at all with it. Scanners have become highly complicated these days. Your help is appreciated.
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