How my SDR-Play Duo is Connected
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- Опубликовано: 27 авг 2024
- How the IC-7100 is connected with the SDR-Play plus ideas on how to connect a boatanchor transmitter. Note that some radios such as the TS-590sg have receiver outputs which would eliminate the need for the MFJ-1708bsdr.
I am planning a similar setup except that I have a Wide Band Small Loop Receive antenna feeding the SDR-Play Duo. I purchased the DX Engineering RTR-2 transmit/receive switch with a preamp. I tapped the PTT signal coming out of my CAT cable and fed it to the RTR-2. This allows me to use listen through the Small Loop Antenna for receive and still use a MyAntenna EFHW to transmit with. I love this setup. Next step is diversity reception...
73's
KM4MQV
Stopped by for the sdr thing, then realized you`re a "real" ham , with boat anchors and point to point wiring and all.
Great channel. I`ll have to stop by more often. So much great stuff, so little time. Hi Hi. KD6CFE was here. 73`s.
Great video. In the process of setting up something like this. Thanks.
Excellent Video Steve. Before MFJ came out with their MFJ-1708 series T/R switches I built a fast T/R relay system so i could use my SDRplay RSP2 with my FT-450D using the same antenna. I use the keying line from the FT-450D after running some tests on the relays I used and the FT-450D with my Storage Scope and learned that the Keying line goes low and the relays are fast enough to transfer before RF is produced from the transmitter. I also have the separate grounding relay which operates in less than 1ms. to ground the SDRplay. I don't have the DX engineering protector, but have had no problems since I built it. If I had to do it over I would buy the MFJ-1708sdr! I spent almost as much on parts and A LOT MORE ON TIME designing and building it than the MFJ product sells for. --Tom WA4GIM
I still have the FT-450AT and I was wondering about the keying line as well but you helped clear some stuff up.As my loose money has changed I think I will be going this route,using the MFJ=1708 series and just hope for better days to return again.73s de Kd5kkh
Excellent job, Steve. You took the time to explain what your objectives were along with each and every item in the chain. 73, Jon Pearl - W4ABC
Curious what your loss was with all the interconnects? I tried the 1708b for sdr, worked fine except on 6M..Lots of bleed thru and OVF warning on my RSPdx.
Mike, are you using the CNTRL output for Tx ground? Or are you relying solely on the 1708B? I'm curious to know. I want to keep my MAT-30 Tuner with my 991-A and was wondering how effective the 1708B-SDR is for protecting the SDRPLAY
Steve great video, I recently upgraded to an RSPDX. Interested in the Receiver Guard your are using fm DXEngineering. What model number is it and what frequency range does it cover or protect? tnx & 73
Would be curious to know too the DX receiver guard part number .. searching around, I haven’t located it yet - thnx !
Fantastic video 🎉🎉🎉
The MFJ TR sense is just that, a "T" splitter switch. I experimented and found better results using a straight "T" splitter and RF guard.
The 3db roll off of the MFJ is too much signal sacrifice IMO.
what DX engineering protection box, item number is that to protection the SDR from blowing up. Im in the earlier stages, and Im planning on running a amplifier though it, Not sure how that will all hook up either.
RG-5000HD. Not sure if they are available now. There are cheaper ones around that use light bulbs. Google search receiver front end protectors.
im about a year too late but im getting into sdr a simple a/b antenna switch would help and a lot cheaper but knowing myself i would forget to hit that switch lol mfj sounds good to me.. thanks.
Looking good Steve! 73!
Hi Steve,
You said that thhe radio that you are uusing iis an ICOM IC 71, which is a rig that I have actually heard of quite a lot of years ago having been licenced 33 years now. However, the ICOM Radio that You are using is actualy an ICOM IC 7100. Easy for myself and othher owners llike myself who have them to also recognise. So whhat dose that say to newcomers to the hobby looking for THAT ICOM IC 71, ???
Apart from that Steve, A Great video, which I have learnt from, due to having purchased an MFJ 1708 B which hhad no instructions on it. BTW, I also picked up about the you mentioned 12 Volts on the BIAS T Ouyput. Correction my frien But it's onlly 4.7 volts from the BIIAS T OUTPUT, which means that a sepperate 12 Volt PSU would also be required .
Kind Ewgads,
Ray.
M0RAY.
Whats wrong with just using a simple switch... I think the best way is just using a coaxial relay, then it completely isolates the SDR
The man got money to throw away can't you see?
Overkill is the word here.
Naw,,,a simple switch would be old school and we wouldnt need a video or woyld we?
Great video thanks for posting. What is the DXengineering part that is protecting the SDR. Do you know the part number or name ? Thanks again.
DXE-RG-5000 and ebay has china pin diode rf limiters for $4.38 and you can google images for other diy circuits .
slomo53 thanks
This is fantastic. I've been looking for a solution to get a spectrum waterfall with my Yaesu FT-818 because I can't find a panadapter. I have a question though, where would you place an autotuner? I'm guessing between the MFJ RF Sensor and the antenna?
The auto tuner would go where it always does, between the antenna and the RF source which in this case would be the antenna jack on the mfj.
What if you use a HF amplifier . I assume that MFJ cannot handle 400 watts . Any solutions for a QRO sdr switch.
This would go in line before the amp.
This video is awesome and answered many questions. With this MFJ version, is the transceiver connected at all times to allow QSK operation. So little information out there for the CW ops. KX9RT
Sure it is. This does't change a thing as far as QSK is concerned. Receiver QSK switching is done by a relay in the 7610 and it's very smooth and quiet.
@@n4lq I missed my ? mark. Thanks. I was hoping it wouldn't change the QSK operation of the rig. I have a duo on the way. HRO had $50 off.
question. can you just you a receive antenna only with out the 1708 ? just run the SDR to a receive antenna with that DX filter
Yes you can do that. It's hard to beat the transmit antenna for receiving though. Also the 1708 will disconnect the SDR's antenna lead when transmitting providing much better protection than just that DXE gadget.
@@n4lq makes sense. I just don't want to add a bunch of cables to my desk top lol. ,and just want something simple , thank you
posso alimentare il MFJ 1708B SDR a 13.8V?
Yes
ok non ce rischio che si danneggi?@@n4lq
At time 3:15 you said the Bias-T voltage was 12V. According to the data-sheet (RSPduoDatasheetV0.6.pdf), it's 4.7V (100mA).
Can you verify this with your multimeter?
Yes unfortunately you are correct. This will require a separate power injector.
How can I contact you ? Fantastic video !