Front end protection of RSP1a connected to K3 IF out
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Rene Correa, K5JX
I recently acquired an SDRPlay RSP1a that I want to connect to my K3’s IF out jack to set up a panadapter. In the course of my research, I learned of the DX Engineering Receiver Guard Electronic RF Limiter DXE-RG5000HD and similar products. For the time being, my plan is to not connect the SDR to a separate receive antenna, but simply run a 12-inch jumper from the K3 to the RSP1a antenna jack. Any thoughts/suggestions regarding the necessity of a Receiver Guard or similar product in my planned situation?
Many thanks & 73. Rene K5JX |
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Joe Subich, W4TV
None needed as long as you feed the SDR from either IF Out
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or RX ANT OUT. 73, ... Joe, W4TV On 3/20/2023 2:32 PM, Rene Correa, K5JX wrote:
I recently acquired an SDRPlay RSP1a that I want to connect to my K3’s IF out jack to set up a panadapter. In the course of my research, I learned of the DX Engineering Receiver Guard Electronic RF Limiter DXE-RG5000HD and similar products. For the time being, my plan is to not connect the SDR to a separate receive antenna, but simply run a 12-inch jumper from the K3 to the RSP1a antenna jack. Any thoughts/suggestions regarding the necessity of a Receiver Guard or similar product in my planned situation? |
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Ray Maxfield
I would add a Buffer stage or it might Load down the IF Signal. This happened to me on my K3 and the Soft-Rock.
WA6VAB Ray K3
From: Joe Subich, W4TV
Sent: Monday, March 20, 2023 12:01 PM To: Elecraft-K3@groups.io Subject: Re: [Elecraft-K3] Front end protection of RSP1a connected to K3 IF out
None needed as long as you feed the SDR from either IF Out or RX ANT OUT.
73,
... Joe, W4TV
On 3/20/2023 2:32 PM, Rene Correa, K5JX wrote: > I recently acquired an SDRPlay RSP1a that I want to connect to my K3’s IF out jack to set up a panadapter. In the course of my research, I learned of the DX Engineering Receiver Guard Electronic RF Limiter DXE-RG5000HD and similar products. For the time being, my plan is to not connect the SDR to a separate receive antenna, but simply run a 12-inch jumper from the K3 to the RSP1a antenna jack. Any thoughts/suggestions regarding the necessity of a Receiver Guard or similar product in my planned situation? > Many thanks & 73. > Rene K5JX >
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If this mod is installed
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https://ftp.elecraft.com/K3/Mod%20Notes%20Alerts/IF_Output_Buffer_Gain_Mod_Rev_A.pdf you shouldn't need one. On Mon, Mar 20, 2023 at 01:59 PM, Ray Maxfield wrote:
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Lawrence Godek
I tried that with my SDR. RSP1. Seems to me the signals were inverted from what they should be, USB as seen as LSB etc. Been awhile since i tried it so i don't remember all the details. Aniway i have a MFJ 1708B that does the trick for me. I don't run over 100W so it's safe for the SDRPlay. Larry W0OGH On 3/20/2023 1:59 PM, Ray Maxfield
wrote:
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Andrew G8BYB
I used to use a SDR2 (with HDSDR) with my K3S a while ago and had no real problems. I seem to recall that everything was OK on HF bands but 6m band was inverted and I had to “flip the switch” in HDSDR to display the correct sideband. I also seem to recall having to tweak the frequency offset slightly. Worked absolutely fine even with 100W out.
From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Lawrence Godek
Sent: 21 March 2023 08:02 To: Elecraft-K3@groups.io Subject: Re: [Elecraft-K3] Front end protection of RSP1a connected to K3 IF out
I tried that with my SDR. RSP1. Seems to me the signals were inverted from what they should be, USB as seen as LSB etc. Been awhile since i tried it so i don't remember all the details. Aniway i have a MFJ 1708B that does the trick for me. I don't run over 100W so it's safe for the SDRPlay. Larry W0OGH |
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Joe Subich, W4TV
On 3/21/2023 7:13 AM, Andrew G8BYB wrote:
I used to use a SDR2 (with HDSDR) with my K3S a while ago and had no real problems. I seem to recall that everything was OK on HF bands but 6m band was inverted and I had to “flip the switch” in HDSDR to display the correct sideband.In HDSDR -> Options (F7) -> RF Front End frequency options ... *Check* "Mirror RF Spectrum for Tune >= 40,000 KHz That will automatically account for the K3 inversion on 6 Meters. 73, ... Joe, W4TV On 3/21/2023 7:13 AM, Andrew G8BYB wrote: I used to use a SDR2 (with HDSDR) with my K3S a while ago and had no real problems. I seem to recall that everything was OK on HF bands but 6m band was inverted and I had to “flip the switch” in HDSDR to display the correct sideband. I also seem to recall having to tweak the frequency offset slightly. Worked absolutely fine even with 100W out. |
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Paul
I’ve been using the MFJ 1708 successfully, but there is a review of the RXAudite in this month’s QST that looks interesting
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On Mar 21, 2023, at 6:57 AM, Andrew G8BYB <stuff@...> wrote:
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Andrew G8BYB
Thanks for the comment, it clarified my memory a little. It is all a bit academic now as the K4 does it all for me.
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I do seem to recall that one of the issues I had with HDSDR was when using my external 2m transverter (28MHz IF), configured to display 144MHz frequency display on the K3S, switched to the wrong sideband on HDSDR as I suspect it thought the frequency was above 40MHz. I ended up running with the K3 display as 28MHz with the transverter which was fine. 73 Andrew G8BYB -----Original Message-----
From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Joe Subich, W4TV Sent: 21 March 2023 13:05 To: Elecraft-K3@groups.io Subject: Re: [Elecraft-K3] Front end protection of RSP1a connected to K3 IF out On 3/21/2023 7:13 AM, Andrew G8BYB wrote: I used to use a SDR2 (with HDSDR) with my K3S a while ago and had noIn HDSDR -> Options (F7) -> RF Front End frequency options ... *Check* "Mirror RF Spectrum for Tune >= 40,000 KHz That will automatically account for the K3 inversion on 6 Meters. 73, ... Joe, W4TV On 3/21/2023 7:13 AM, Andrew G8BYB wrote: I used to use a SDR2 (with HDSDR) with my K3S a while ago and had no real problems. I seem to recall that everything was OK on HF bands but 6m band was inverted and I had to “flip the switch” in HDSDR to display the correct sideband. I also seem to recall having to tweak the frequency offset slightly. Worked absolutely fine even with 100W out. |
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Petr Ourednik
Hi Paul and others,
Could someone share this article for non-subscribers please? 73 - Petr, OK1RP -- B: http://goo.gl/Fd2JhJ YT: https://urlzs.com/UHNH9 MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt -- 機能するものを変更しないでください。 What could be easier..? ¯∖_(ツ)_/¯ |
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