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WD8BXS
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[solved] Receiving strong sigs 12.KHZ
« on: 19. July 2018, 14:59:18 »

This is the first time on a V6 radio that I have heard this.
I am hearing strong signals that are -12khz from the tuned frequency.
It does not matter where I place the xlate 0, -6, or -12, the same thing still happens.

Any ideas??

Chuck
« Last Edit: 13. September 2018, 21:56:47 by WD8BXS » Logged

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De WD8BXS vy 73
DF8OE
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Re:Receiving strong sigs 12.KHZ
« Reply #1 on: 19. July 2018, 15:51:37 »

12KHz regardless of Xlate setting? That sounds to be a real signal at that frequency...

If"mirror" does not change by Xlate setting, it is "real signal" - I think.

vy 73
Andreas
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DB4PLE
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Re:Receiving strong sigs 12.KHZ
« Reply #2 on: 19. July 2018, 17:10:12 »

Hi Chuck,

1. You tune to frequency X.
2. You (or someone else) generate(s) a signal at X-12khz and you can hear it when tuned to X no matter what XLATE is set to.
3. Can you also hear the signal when tuned to X-12khz?

73
Danilo




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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #3 on: 19. July 2018, 21:32:38 »

Yes, I was listening on 7.180, and I heard a station that I know works 7168.
I tuned to 7168, and there he was.
I tuned back to 7180 and there he still was over top of the station on 7180

73
CHuck
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Re:Receiving strong sigs 12.KHZ
« Reply #4 on: 19. July 2018, 21:45:21 »

Hi Chuck,

- Any chance that the station at 7168 was transmitting a second strong signal 12khz from its main frequency?
- Did you had the opportunity to verify with a second receiver that only the 0.6 mchf heard the signal at 7180? If not, you should really try to see if this also happens if use a signal generator or second transmitter.

73
Danilo



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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #5 on: 20. July 2018, 11:55:09 »

I will try to duplicate this again later today.
I will keep you posted.


Thanks,
73,
Chuck
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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #6 on: 20. July 2018, 15:00:50 »

I can tune any station on my Icom 7610, and hear them 12khz higher AND 12khx lower on my MCHF !!!

This is regardless of where the translate is set.

Chuck
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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #7 on: 20. July 2018, 16:03:19 »

Here is a video of this issue:

https://www.dropbox.com/s/bjcdefj60satuiw/REC_0003.MOV?dl=0
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Re:Receiving strong sigs 12.KHZ
« Reply #8 on: 20. July 2018, 16:06:53 »

I do not have any idea what this can be caused by. It is unlogical, because there is no math that allows that.

Sorry - no hint from my side. If you would have written "...at 6KHz Xlate..." there *is* a math. But at 12KHz Xlate there is no math - the spacing must be 24KHz.

First you should swap RF or UI PCB to another mcHF which is running fine so that you are able to decide on which board it is. And the I would be very pleased if you can give us a feedback what was the cause when you fixed it.

vy 73
Andreas
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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #9 on: 20. July 2018, 18:05:54 »

Swapped out a "U" Board, NO Change.

I will have to build an RF Board.

73,
Chuck
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DJ3FV
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Re:Receiving strong sigs 12.KHZ
« Reply #10 on: 21. July 2018, 06:15:00 »

Hi Chuck,

is your radio a chinese clone (RS-918)  based on the V0.6 mcHF? I am asking because I read that in this radios parts have been replaced by cheeper chinese parts. This could  be a root cause for such effects. 

73, Uwe
« Last Edit: 21. July 2018, 06:20:20 by DJ3FV » Logged

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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #11 on: 21. July 2018, 13:32:23 »

Hi,

This is NOT a clone! I built it!

73,
Chuck
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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #12 on: 21. July 2018, 17:26:06 »

OK, The verdict is in.
I just finished another RF board and it does NOT have the spurious receive!!!

Now what area do I start looking??
Or do I just randomly poke around??

CHuck
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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #13 on: 21. July 2018, 20:19:17 »

I was wrong, the new one does it also!!!!

Chuck
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WD8BXS
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Re:Receiving strong sigs 12.KHZ
« Reply #14 on: 21. July 2018, 20:22:50 »

There is no s meter reading for the extra signal.

Just on the main signal.

Chuck
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Diskussions- und Newsboard des DARC-Ortsverbandes I40  |  allgemeine Kategorie  |  mcHF Projekt Deutsch / English (here you can discuss everything related to mcHF) (Moderators: DF8OE, DL1PQ)  |  Topic: [solved] Receiving strong sigs 12.KHZ <- zurück vorwärts ->
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