Thank you, Rick. Will do. Sent from my iPhone
> On Feb 1, 2021, at 2:17 PM, Mark Brantana <mark.brant...@gmail.com> wrote: > > Thank you. No plasmas. > > > Sent from my iPhone > >>> On Feb 1, 2021, at 11:23 AM, Rick Hiller via BVARC <bvarc@bvarc.org> wrote: >>> >> >> Mark, >> >> Have a read of the September 2017 BVARC Newsletter -- The Radio Hotel column >> is about receive noise, etc. Also look at the referenced QST column. >> >> Might help you in your quest. >> >> Rick -- W5RH >> >>> On Mon, Feb 1, 2021 at 8:47 AM Mark Brantana via BVARC <bvarc@bvarc.org> >>> wrote: >>> I will check all these things. >>> >>> Sent from my iPhone >>> >>>>> On Jan 31, 2021, at 10:16 PM, Doug SEYLER via BVARC <bvarc@bvarc.org> >>>>> wrote: >>>>> >>>> >>>> If you have. A battery powered sw receiver, check to see if it is present >>>> there. If so, trip the main power to the house to see if it goes away. RFI >>>> can be very broad banded. I’ve had power line noise that extends cripples >>>> a lot of the spectrum. >>>> >>>> Doug W9LCQ >>>> >>>> Sent from my iPad >>>> >>>>>> On Jan 31, 2021, at 9:00 PM, Rick Hiller via BVARC <bvarc@bvarc.org> >>>>>> wrote: >>>>>> >>>>> >>>>> Although it is a Ham Band antenna for 40,20,10....you might try listening >>>>> to General Coverage and tune to 10, 15 or 20 MHz for WWV......see if you >>>>> can hear it.....from what you say, I doubt it, and if so, you have a >>>>> radio set up issue, IMHO.....Rick >>>>> >>>>> Virus-free. www.avast.com >>>>> >>>>>> On Sun, Jan 31, 2021 at 8:45 PM Rick Hiller <rickhille...@gmail.com> >>>>>> wrote: >>>>>> Mark, A few questions, comments and tests: >>>>>> Sounds like a radio problem to me...so....not in any particular order, >>>>>> just what I thought of first to last.... >>>>>> . >>>>>> -- What S level is the noise? Does it change level with the RF Gain >>>>>> control? >>>>>> -- What if you disconnect your antenna coax? Does it go away? >>>>>> -- What if you connect a dummy load? Same noise? >>>>>> -- What does the Nano VNA show? Impedance wise (R and j) and SWR? >>>>>> What is the SWR bandwidth of the antenna across 40 and 20? >>>>>> -- Where is your RF Gain pot? Maxed? Try reducing the setting a bit. >>>>>> -- Do you have your "pre-amp" on? If so, turn it off. NB off too. >>>>>> -- What about CW mode....does the Narrow filter on make a difference? >>>>>> -- Where are the IF/PBT shift sliders set? They should be in the center >>>>>> for a base reference. >>>>>> >>>>>> -- Are the rear panel Receive Antenna In and Out jacks jumpered and is >>>>>> the jumper OK continuity wise? >>>>>> >>>>>> -- Is the Ham/General select switch in Ham position? I am not sure if >>>>>> the band pass filters are bypassed in General....just a guess. >>>>>> >>>>>> -- Take your coax off. Then using ONLY the center pin of the PL-259 >>>>>> insert it into the radio SO-239 center ONLY. Is the noise similar? >>>>>> Then screw on the PL-259 outside....does the noise change? Usually, >>>>>> using only the center pin causes lots of receive noise and then when you >>>>>> screw on the 259 outside the noise reduces as the antenna system is then >>>>>> a closed system. >>>>>> You can also do this with a 10 foot long piece of wire and just connect >>>>>> the wire to the inside center terminal of the SO-239 on the radio. The >>>>>> receive noise should increase when you touch the wire to the center >>>>>> pin......is this noise the same as you are complaining about? >>>>>> >>>>>> Have you run power to the antenna? What is the SWR? Similar to the >>>>>> Nano reading? Use the internal SWR meter and meter switch to select RF >>>>>> PWR and SWR set etc. >>>>>> >>>>>> That's about it for a 745 brain dump for tonight. Something is amiss >>>>>> in your set up, IMHO, no external wideband white noise source is jacking >>>>>> with ya. Sounds like receiver noise is at max gain and no received >>>>>> signals are being processed. >>>>>> >>>>>> GL and 73...rick -- W5RH >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Virus-free. www.avast.com >>>>>> >>>>>>> On Sun, Jan 31, 2021 at 7:33 PM Mark Brantana via BVARC >>>>>>> <bvarc@bvarc.org> wrote: >>>>>>> I am reaching out for ideas on a radio issue. I have installed an >>>>>>> IC-745 Icom with an MFJ-2010 offset fed dipole. The power supply is a >>>>>>> 20A MegaWatt switching power supply, which is located right next to the >>>>>>> radio. The antenna is under some high power-lines with the long leg 90 >>>>>>> degrees to the power-lines. I used my nanoVNA to study the band SWR >>>>>>> response, and everything looks reasonable, though some small >>>>>>> adjustments may need to be made. Nothing is grounded as yet. >>>>>>> >>>>>>> Here’s my problem. I am only attempting to receive at this time and I >>>>>>> get consistent QRM white noise across all bands to the point where I >>>>>>> can barely pick out some voices, etc. >>>>>>> >>>>>>> I am confident that the antenna is properly connected due to my antenna >>>>>>> study. >>>>>>> I don’t believe the power lines are an issue, since the problem would >>>>>>> likely be more isolated show up as birdies at certain frequencies. >>>>>>> The radio settings seem to all be correct according to the manual. >>>>>>> Lack of grounding, but again the white noise is generally consistant >>>>>>> across the spectrum. Still, this could be the problem. >>>>>>> I have turned off my computer, so there no QRM from its power supply. >>>>>>> It does not help to have the switching power supply right next to the >>>>>>> radio, but other users give good reports on this model and no QRM >>>>>>> issues are mentioned. >>>>>>> I tried the radio at different times of the day on 20-m voice band, >>>>>>> with the same noisy result. >>>>>>> It could be the net result of a large number of small device >>>>>>> transformers, but I doubt it. >>>>>>> I turned off the wifi, and still no change. >>>>>>> >>>>>>> Hmm… I am a little stumped. Any thoughts or ideas? Personal experiences? >>>>>>> >>>>>>> Mark >>>>>>> N5PRD >>>>>>> ________________________________________________ >>>>>>> Brazos Valley Amateur Radio Club >>>>>>> >>>>>>> BVARC mailing list >>>>>>> BVARC@bvarc.org >>>>>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>>>>> >>>>>> >>>>>> -- >>>>>> Rick Hiller >>>>>> e-mail: rickhille...@gmail.com >>>>>> Cell: 832-474-3713 >>>>>> Physical: 9031 Troulon Drive >>>>>> Houston, TX 77036 >>>>>> >>>>>> Virus-free. www.avast.com >>>>> >>>>> >>>>> -- >>>>> Rick Hiller >>>>> e-mail: rickhille...@gmail.com >>>>> Cell: 832-474-3713 >>>>> Physical: 9031 Troulon Drive >>>>> Houston, TX 77036 >>>>> ________________________________________________ >>>>> Brazos Valley Amateur Radio Club >>>>> >>>>> BVARC mailing list >>>>> BVARC@bvarc.org >>>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>>> ________________________________________________ >>>> Brazos Valley Amateur Radio Club >>>> >>>> BVARC mailing list >>>> BVARC@bvarc.org >>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>> ________________________________________________ >>> Brazos Valley Amateur Radio Club >>> >>> BVARC mailing list >>> BVARC@bvarc.org >>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> >> >> -- >> Rick Hiller >> e-mail: rickhille...@gmail.com >> Cell: 832-474-3713 >> Physical: 9031 Troulon Drive >> Houston, TX 77036 >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing list >> BVARC@bvarc.org >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
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