Re: SDR dongle for spectrum analyzer with signal from Bitx40?
Haha!? Right, I've got the RTL-SDR Blog dongle.
Or I could use someone else's...
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Re: BITX40 - frequency spectrum - Raduino irradiation - intermodulation products -
#bitx40help
Hi Raj,
thank you for your answer :-)
Is this only possible by RV1 / RV136?
?
Frank
?
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Re: SDR dongle for spectrum analyzer with signal from Bitx40?
Maybe use a cheap dongle and a power meter until you're confident in the switch??
On Dec 15, 2017 9:30 AM, "Arvo KD9HLC via Groups.Io" <arvopl= [email protected]> wrote: It's still kinda scary to think about how much RF I might TX straight into the RSP1A even if the switch is working.
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Re: BITX40 - frequency spectrum - Raduino irradiation - intermodulation products -
#bitx40help
Did you do the LPF mod? I had to add the cap on the bottom of the board.
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Re: BITX40 - frequency spectrum - Raduino irradiation - intermodulation products -
#bitx40help
Frank,
If you have spare IRFs around try this.
Slowly increase the final quiescent current and see!
Raj
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Do any of you have a solution ?
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I am trying to get some good pictures of where I think beginners might stumble. For example, I have a blowup of the stereo connectors from the bottom showing the GND, RING, and TIP connections. Same for the volume control and encoder. Al Peter, AC8GY, is a great photographer and I'm trying to get him to shoot the photos. He did this one for me, which shows the ?BITX as it comes out of the box.
The more I get into the review, the more I think it needs to be published quickly, so I may go with CQ magazine. QST has a very long lag right now. The downside is the size of the audiences. Still not sure where to try and get it published...
Jack, W8TEE
From: Joel Caulkins <caulktel@...>
To: [email protected]
Sent: Friday, December 15, 2017 9:35 AM
Subject: Re: [BITX20] It's alive!
Jack, I also look forward to your review of the uBitx. More high res pictures is good also. Thanks.
Joel
N6ALT
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Jack, I also look forward to your review of the uBitx. More high res pictures is good also. Thanks.
Joel
N6ALT
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Re: SDR dongle for spectrum analyzer with signal from Bitx40?
It's still kinda scary to think about how much RF I might TX straight into the RSP1A even if the switch is working.
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Re: SDR dongle for spectrum analyzer with signal from Bitx40?
Arvo, Very cool find, thanks for sharing!?
John
On Dec 15, 2017 8:52 AM, "Arvo KD9HLC via Groups.Io" <arvopl= [email protected]> wrote: I was looking at this to switch the antenna between my recently ordered RSP1A and my recently ordered ?BitX:
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Same boat here. Ordered on the at 2300z on the 9th. My Paypal transaction has no shipping number added as of a few min ago.
Joe KD9JLV
On Fri, Dec 15, 2017 at 8:11 AM Karl Heinz Kremer, K5KHK < khk@...> wrote: Bill,
have you checked your PayPal transaction for a tracking number? The information should get updated, once the package ships.?
Karl Heinz - K5KHK?
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Bill,
have you checked your PayPal transaction for a tracking number? The information should get updated, once the package ships.?
Karl Heinz - K5KHK?
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I see someone had ordered on the 9th and received already, I also ordered on the 9th and
have not received the kit or any word from DHL.
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Re: SDR dongle for spectrum analyzer with signal from Bitx40?
I was looking at this to switch the antenna between my recently ordered RSP1A and my recently ordered ?BitX:
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Thanks Jack, I look forward to receiving it someday.
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On Dec 15, 2017, at 5:37 AM, Jack Purdum via Groups.Io < jjpurdum@...> wrote: Mornin' Joel:
Well, I listened on 80M and things were jumping. I don't have an antenna for 80M so I can't attest to that, but you're going to love this radio. I got the rig as a Beta tester for Ashhar, but it did come DHL. I've never had a problem with them.
Jack, W8TEE
Hi Jack, have you tried 75/80 meters? I'm hoping it's sensitive there as I want to use it by my bedside at night. Also, you must have chose the DHL shipping option, In hindsight I wish I had done that, I have had so many bad experiences with DHL I just decided not to ship that way:-( Twice they have lost my packages in Germany.
Joel
N6ALT
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Re: SDR dongle for spectrum analyzer with signal from Bitx40?
I think most would have the SDR dongle attached to the computer outside the Bitx's enclosure, so they could use the dongle with other antennas for different applications.?
I was going to run the coax from the cap/tap on the PCB to a BNC panel mount on the exterior and then connect the SDR at will. For example, I may not want to bring the SDR, computer, and monitor while doing POTA.
John
On Dec 13, 2017 2:47 PM, "Jerry Gaffke via Groups.Io" <jgaffke= [email protected]> wrote: The really cheap SDR dongles (meant for DVB-T television reception, $10) can get down to 30mhz without a downconverter (as I recall).
They only have an 8bit A2D converter, so reception with the uBitx receiver would have much more dynamic range.
The uBitx has a 45mhz first IF which should be within reach for the DVB-T dongle for displaying a spectrum of what's in the band,
tap in the dongle just prior to the 45mhz crystal filter so you can see more than a few khz worth.? Downside is this may inject a lot of hash
into the uBitx receiver, good luck getting rid of that.? Maybe a buffer amp of the 45mhz IF inside the uBitx enclosure, a coax going out
to a separate box for?the dongle?
On Wed, Dec 13, 2017 at 10:27 am, Arvo KD9HLC wrote:
What would be the advantages of using anything else for RX?? (I'm kinda new at all this.)
And if one is going to set up a spectrum analyzer that (from what I understand from the original post) picks off the incoming signal inside the BitX, why not just use the SDR for RX?
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Ashhar, Sarma, Raj, other? Is it feasible to drive the uBitX PAs at 24V, or is that asking for trouble? Apologies if this has already been covered; please point me to the thread. Thanks, Craig w9ctw
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How to use an SDR for an antenna analyzer:
And a noise source that's less expensive than the one in the article, and you won't need the splitter:
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Re: Looking forward to a build
Well done on getting your licence!?
I started with the BITX40, it's an amazing bit of kit and was perfect for my budget. I like how well it's supported too and you can go very far adding to the bare bones kit.?
I've had that now for about 6 months or so and haven't tired with it tinkering. I have just ordered a uBITX and it looks as if postage is after the 25th now, I'm happy to wait though!
I'd say start with the single band board and there's no such thing as too many radios anyway!!
73, Alex
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Mornin' Joel:
Well, I listened on 80M and things were jumping. I don't have an antenna for 80M so I can't attest to that, but you're going to love this radio. I got the rig as a Beta tester for Ashhar, but it did come DHL. I've never had a problem with them.
Jack, W8TEE
From: Joel Caulkins <caulktel@...>
To: [email protected]
Sent: Thursday, December 14, 2017 6:13 PM
Subject: Re: [BITX20] It's alive!
Hi Jack, have you tried 75/80 meters? I'm hoping it's sensitive there as I want to use it by my bedside at night. Also, you must have chose the DHL shipping option, In hindsight I wish I had done that, I have had so many bad experiences with DHL I just decided not to ship that way:-( Twice they have lost my packages in Germany.
Joel
N6ALT
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I already have the parts to build one of K4EAA / W8TEE¡¯s dummy load and power-to-voltage converters, but this is tempting as an even lower-cost option. What do you all think? Grease and heat sink? Oil bath?
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Arvo W0VRA
N8DAH
Raj vu2zap
Joel Caulkins/N6ALT
Craig Wadsworth