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The spectrum has a very low noise level, and can remove the base noise. You can also calibrate the S-meter to match your transceiver.

@quantum-SDR thanks

Would be good to see a photo of the Spectrum DSP with the Ranger 2995

It is very easy to connect the PTT line from the back of the FT-891 to the switch, which is always as you mention the best option.

@quantum-SDR not with siegu, you need DE19 or CE19, not sure what compatibility has your device with DE/CE-19

Also mot sure if you use for G90 the IQ output,but I found in the mine, only a couple moths old with last firm,IQ port is not working, so either not sure how your device deal with IQ

@@Pointverse-zs4bs The Spectrum SDR bridges the Xiegu G90 to the PC, com port and audio stream, so it can replace the DE19, otherwise you can connect the CAT output to the Spectrum at the same time as the DE19 (transmit data to Spectrum only).

Connecting the PTT line from the back of the FT-891 is recommended as you mention.

KX3 is my favorite radio as well and the QSDR gives it what it was lacking

how long did you wait for shipping after placing your order?

1) The RF gain can be adjusted -30dB +4dB, 2) Real RF pre-amp, 3) The members decided not to share the schematic at the moment to avoid clones being made that would undermine the project and quality

@@quantum-SDR , i thought this was an ""open" project ? ... without the schematics it is difficult to know if it is well designed or not ... so we have to assume it is ... anyway a VGA seem the right way to do it ... but some atennuator (isolator) inside the to be connected receiver's if-output, might help avoiding unwanted noises (bidirectional).

@@djmambito2 The Spectrum has an isolator and pre-amp, but it is common practice to add a buffer amplifier inside the transceiver, though in our tests with the RF tap on the FT-891 it wasn't necessary. In fact the Spectrum DSP was able to resolved weak SSB stations that were unintelligible on the 891. For most people the external SDR antenna switch works more than adequately avoiding the need to open the FT-891. Full details are given in the manual available at QuantumSDR.com/support from pages 70 onward

@@quantum-SDR , I understand that with the Switch , we will be using the SDR as receiver instead of the main receiver ... so we wont take advantage of a probably better (more expensive) receiver in the main set ...correct ? .... so i would prefer the IF tap method instead of the switch ... hope i understood it well and the switch-method is for those that cant have a IF-tap . lets call it "Plan-B" 😄

@@djmambito2 The HF receiver on the Spectrum DSP is a little more sensitive than the FT-891, the very best results are using the RF tap on the 891 main board, the Spectrum then uses the band pass filters and pre-amp of the 891 giving a very low noise and sensitive receive audio from the Spectrum. If you email info@quantumsdr.com we can send you the tap point diagram. What you want to avoid is using the 69,458 MHz 1st IF signal which is very wide band and prone to generate aliases on SDR systems, including RP1A

The power connector works well, what issue do you have? It also powers off the USB C

@@quantum-SDR , ha ha , i dont have an issue, i thought you have an issue (as you showed in the video), so i suggested how to solve your issue for a next design by not placing the socket on the pcb

Good question!

The Spectrum DSP has two full speed USB-C ports, the Host port connects to the FT-891 USB-B port and works perfectly as it has a CP210X USB driver. The other USB port can be used to bridge data and audio to a PC or tablet for logging etc., compatible with WSJX, Ham Radio Deluxe and HDSDR etc. Both ports can be used to connects keyboards and other Human Interface devices.

Ah ok. Light bulb just went on in my head. Since you use the RF switch for the SDR side [not cat control] there's no need to solder a tap on the main board of the 891 in this scenario. Much easier. Thanks for the info. 73 de AJ6EE

@@kevinbrouelette6361 no, the tap to the main board isn't required and the results with the SDR antenna switch are really excellent. With the RF tap to the main board though, the signal/noise level is so good that the Spectrum can hear signals that are just unintelligible on the 891 alone, but unless you really need weak signal performance its not necessary.

Please email info@quantumsdr.com for technical support. You must set the menu as shown in the manual, pages 71-78, available in the support section of our website.

I mail belore christmass and send photo like they demande me and they never answer me,

@@polode9446 We are emailing you now, you attached images but they have "0 bytes". Please try to send the images as 1024 pixels wide .jpg format

By a serial data CAT cable, and an IQ cable, all supplied for plug and play operation.

The videos on our QuantumSDR Facebook group are much higher resolution. There are also videos on the M0FXB Ham TH-cam channel.

There are several people using the Spectrum DSP with the FT-991a, and one produced a guide available on request from info@quantumsdr.com. Basically there are two connections, the CAT over RS232, and either using a $37 SDR antenna switch, or an RF tap to the main board.

Thank you! It's a team effort, developed because we wanted to have a good scope and DSP audio on our Elecraft and Xiego G90 radios. There is an active QuantumSDR group on Facebook and more independent videos from Andreas M0FXB. 73

It will work with any HF transceiver, either with an RF/IF tap or a $37 antenna switch box.

a mouse can be used, if you order just request it with the USB mouse setup

The settings are shown at the rear of the 78-page user manual available in the support section of the QuantumSDR.com website. The rear pins must be set to RF input mode.

You're going to have to give more details.

@@quantum-SDR It looks like the Noise Blanker (NB) is turned on in the video. When receiving strong stations and the NB is on can cause audio distortion.

@@frankENZC no distortion, the noise blanker works really well

There is no noticeable loss in signal reception, and in most cases, the reception via the Spectrum is able to pull weak stations out of the noise, especially in offset low-noise mode. See the weak signal videos on our TH-cam site under the same name.

yes, fully compatible, with IF tap or $37 SDR antenna switch. Email info@quantumsdr.com for details.

@@courierdog1941 just not enough hours in the day

You've emailed us at QuantumSDR and we have replied to your query.

First off, we don't sell the switch-box, second, its only $37 online

@@quantum-SDR Well the one it took me to on google was anywhere between $150 -$200 plus !

if its only $37 on line can you provide the link please

@@101jumpit SDR antenna switch, AliExpress (also on Amazon and eBay):- 160MHz 100W Antenna Sharer SDR Transceiver TR Switching Device Gases Discharge Protecting Aluminum Alloy Box Device - AliExpress 1420 www.aliexpress.us/item/3256806162395778.html?spm=a2g0o.productlist.main.9.b0a3c3bjc3bjNp&algo_pvid=0668c2e6-6e9d-4f4a-a0b6-fcb73c26337e&algo_exp_id=0668c2e6-6e9d-4f4a-a0b6-fcb73c26337e-4&pdp_npi=4%40dis%21USD%2133.66%2133.66%21%21%2133.66%2133.66%21%40211b61d017249246783262474e94f7%2112000037185100326%21sea%21US%21103819261%21X&curPageLogUid=P3oPRlIOpiIr&utparam-url=scene%3Asearch%7Cquery_from%3A

@@quantum-SDR Thqank you :)

Yes, it works with any HF transceiver. You can find details for the IF tap below, or use the SDR antenna switch 100W. FT-857 IF tap: th-cam.com/video/VJC3tlmZiS8/w-d-xo.htmlsi=8oq_Y-cex1LATHSp General info: Hank's Digital Domain | KB4MTO | Ham Radio - Yaesu FT-857D Settings (hanklambert.com)

One nice feature of the Spectrum DSP 5" is that it works as soon as you turn the transceiver on. The display is also very clear and the response fast, making it easy it see through the pileups.

We just power it off the same 13-8V PSU, 73, Julian

@@quantum-SDR ok thanks, I may put power poles on switch box plug also and run it off the same battery as the 891….for field use

Yes, you can connect it with an IF tap or simply with the SDR antenna box which costs about $37 on AliExpress. Email us to get the link. As the 6666 has no CAT, the Spectrum is displayed with plus and minus offsets.

On our website, click the support tab, and you'll see the 75-page user manual. There is also more information and videos on our TH-cam page, and the Facebook group.

Please email info@quantumsdr.com, marking the Subject line QUESTION. You will receive a reply.

Yes, the price including delivery is in the store at QuauntumSDR.com. Both versions work with the FT-891.

Exactly, it would be nice if they listed a "bundle" for the setup shown in the video..especially since the FT-891 is crazy popular...

QuantumSDR is a group project so if we find a good product we share the links to the sellers. You only have to ask for the info pack. Info@quantumsdr.com

Yes, it will work with the FT-897D, you should order the M3+ TTL version. From Yaseu it indicates the 897 has a TTL level CAT port on the back that will connect directly to the M3+ TTL: "Yaseu: The Optional CAT Interface Cable CT-62 is a connection cable for the FT-897 and your computer. The CT-62 has a built-in level converter, allowing direct connection from the rear panel CAT/LINEAR jack to the serial port of your computer, without the need for an external RS-232C level converter box." You won't need the CT-62 cables. If you also have an Elecraft or radio with RS232, the you could order the M3+ RS232 and use the CT-62 cable with the 897 to connect to the Spectrum M3+ RS232 as well.

@@quantum-SDR Thank you very much for your informative reply. I can't wait to get a waterfall display on my Yaesu. That spectrum scope is mediocre at best. I wondered when someone would come out with this type of instrumentation/display. I compliment you on developing this product.

@@Matt-qq8dh Thank you!

@@quantum-SDR Hello. I have a G90, too. This M3+ TTL version will work out great for my 897D and G90. That's great. Thank you again. I will get this soon.

The educational kits comes without software, so I'm afraid that won't help you. The lowest costs way to add a Spectrum display to your radio is using a PC and SDR software like HDSDR. If you Google this you will find the information you need. 73

yes, any HF-4m transceiver, this is made by QuantumSDR.com

Thanks Will, appreciated! We've quite a lot of feature updates for the firmware planned which you'll be able to download, and also new hardware too, it will be interesting to see where we can go with this project

The FT-2000 has an RS232 CAT DB-9 port, so you will need the Spectrum DSP M3+ RS232 model. The FT-2000 has a 69.55 MHz 1st IF that can be tapped and connected to the Spectrum. Several buffer boards, and a down-converter are on the market if needed, but a direct connection is possible. Otherwise you can use the Antenna switch box as shown on the video.

It can be powered from the radio or any source from 7 to 17VDC, also from USB, and it draws very little power having an 86% efficient power unit.