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[Articles Home]  [Add Article]  

Add a Panadapter to the IC7000

from tclinard@hotmail.com on May 30, 2014
View comments about this article!

Add a Panadapter to the Icom IC-7000

Here is how you do it. Tap off the first IF of the IC-7000 via this method.

IF 124.488Mhz is an adequate input to my dongle to create a pan adapter that has a band spread of 48 kHz +. The tap point is between L703 & D704, the output side of the transformer to the next stage.

Viewing from the top of the board: this is the upper left hand corner of the transformer solder point with the radio facing ones front. The difficulty here was taking a fine gage piece of insulated wire and soldering this tiny area on the transformer top board. This area had to be viewed with a magnifying glass.

Once done it was simple to run a piece of RG174, solder to the end of this small wire tap on the + side of the RG174 & ground the RG174 coax shield to the board and use a coupling capacitor of 15uuf to the input of the dongle. (Cut off the little antenna that comes with the dongle and splice the RG174.) It works like charm.

If anyone wants to try this I have submitted all documents needed. The dongle cost $18.00. That's the investment + a little capacitor and a laptop. Shown a screen shot of 40 kHz spread on 40 meters.

Download the installation procedure (in .pdf format) here:
LINK

Download the schematic .pdf file here:
LINK

http://www.nooelec.com/store/sdr/tv28tv2-sdr-dvb-t-usb-stick-set.html

Terry Clinard, WA8OPR

Member Comments:
This article has expired. No more comments may be added.
 
Add a Panadapter to the IC7000  
by VE3TMT on May 30, 2014 Mail this to a friend!
Excellent article,

I have the same setup on my Yaesu FT990. Tapped the first IF at 47.21 MHz.If your radio is interfaced to the PC, it's as easy as point and click. The radio will tune to the spot you clicked on. I use HDSDR for viewing. Using a Creative Labs Fatal1ty card I easily get 200 KHz of viewing.

73,
Max
VE3TMT
 
RE: Add a Panadapter to the IC7000  
by K6AER on May 30, 2014 Mail this to a friend!
I like the article but I am a RF Engineer by profession and most hams will have difficulty understanding the concept.

The article needs pictures, schematics and a layman's perspective on the whole picture. I would like to see more of this type of article for this is what ham radio is all about.
 
Add a Panadapter to the IC7000  
by VE3TMT on May 30, 2014 Mail this to a friend!
The procedure is very simple, but you can't really be specific due to the number of radio makes out there. Basically it involves tapping the first IF in the radio, grabbing the signal where it comes out of the first mixer, but before the filter. In the case of the Yaesu FT990, this signal is grabbed between T1005 and T1010 on the RF board. Again, every radio will be different.

Tap the signal through a coupling cap and feed it into the antenna input on the USB DVB-T tuner. You then set up the software, HDSDR in my case, to sample the same frequency as the IF, and with a few tweaks here and there, you have a panadapter display.With a good sound card, the RX audio sounds very nice as well. If you have the rig set up for PC control, you can click on a signal and the radio will tune to that frequency.

If anyone wants more details, drop me an email, I'd be happy to explain a little further.

my call at gmail dot com

73,
VE3TMT
 
Add a Panadapter to the IC7000  
by W2BLC on May 31, 2014 Mail this to a friend!
I see this article as the seed for a cottage industry.

Panadapters are a fine adjunct to the shack, as indicated by their inclusion on more and more top of the line rigs.

Thanks for a fine article - it shows how a simple mod can bring a rig into the space age.

Bill W2BLC
 
Add a Panadapter to the IC7000  
by KE4ZHN on May 31, 2014 Mail this to a friend!
Great article. More documentation would be nice. I love my 7000. I enjoy that little rig as much if not more than my 756pro.
 
RE: Add a Panadapter to the IC7000  
by K8QV on May 31, 2014 Mail this to a friend!
Wow. Refer back to the "Beat the Heat" thread!!!
 
Add a Panadapter to the IC7000  
by WB8LBZ on May 31, 2014 Mail this to a friend!
I just happen to have one of those dongles so I thought I would give it a try. My picture didn't look like the picture in the article, it was missing the second window. Then I found out I deleted my keyboard driver. I think I'll not cut up my 7000.

73, Larry WB8LBZ
 
RE: Add a Panadapter to the IC7000  
by W9WQA on June 1, 2014 Mail this to a friend!
ok,,tell me about the "dongle", im not "tuned in"
 
RE: Add a Panadapter to the IC7000  
by W2RWJ on June 1, 2014 Mail this to a friend!
I have the same setup on my Yaesu FT990. Tapped the first IF at 47.21 MHz.

Max,
Can you post a photo of the tap point ton he FT990?

73
Martin
W2RWJ
 
Add a Panadapter to the IC7000  
by WA7PRC on June 1, 2014 Mail this to a friend!
Two questions for the OP:

1) How far down from peak response is the response at 48 KHz BW?

2) How do you deal with the gain going up/down w/ changing AGC from strong signals in the passband?

vy 73 es gl,
Bryan WA7PRC
 
Add a Panadapter to the IC7000  
by N6JSX on June 1, 2014 Mail this to a friend!
Doing this very simple IF tap did you notice any RX degradation caused by the tap loading or if the tap injected noise?

If so, consider using (an old old stand-by) MPF102 VHF Amp as a high impedance isolator. The datasheets have a very simple circuit to parrot for you application.
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 1, 2014 Mail this to a friend!
Hi Martin

The tap point is on the RF board between T1005 and T1010. There is a small trace about 1/4" long between the two transformers. There is adequate ground beside the trace to solder the coax braid to. Tap through a .05uf ceramic or tantalum cap. I have experienced no loading through the tap.

Max
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 2, 2014 Mail this to a friend!
W9WQA,

The "dongle" is a USB Digital TV Tuner stick made for the European TV markets. It is incompatible with North American TV broadcasting standards, but some smart guys determined that it could be used as a panadapter by sampling the radio's IF.

Different dongles have different tuning ranges. The dongle using the R820T/RTL2832U combo is the prefered stick. See:

http://www.nooelec.com/store/sdr/sdr-receivers/tv28tv2-sdr-dvb-t-usb-stick-set.html#.U4xzVIVQomI

These sticks have a tuning range of 25 MHz to up over one GHz. The IF signal from the radio is tapped and fed out to the antenna input on the dongle. The dongle is plugged into a USB port on the computer (best to use a USB extension cable to keep any noise out of the radio) and the software is run. HDSDR works best for this application.

You have to load some USB drivers (Zadig) for the dongle. You don't use the drivers supplied by the vendor.

It takes a bit to set up, but well worth it. My radio is interfaced with the computer through OmniRig, so it is as simple as clicking on a signal and the radio follows.

Max
VE3TMT
 
RE: Add a Panadapter to the IC7000  
by W9WQA on June 2, 2014 Mail this to a friend!

The "dongle" is a USB Digital TV Tuner stick...

oh! i have one i used for American tv. ill mess with it if i find drivers?? any help?
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 2, 2014 Mail this to a friend!
The sticks used for SDR were designed for the European TV market.

I can point you in the right direction if you give some more information. What's the model # of the tuner stick you have?

Email me off board, my callsign at gmail dot com

Max
VE3TMT
 
RE: Add a Panadapter to the IC7000  
by W9WQA on June 2, 2014 Mail this to a friend!

The "dongle" is a USB Digital TV Tuner stick...

oh! i have one i used for American tv. ill mess with it if i find drivers?? any help?
 
RE: Add a Panadapter to the IC7000  
by K4AX on June 4, 2014 Mail this to a friend!
A stick for US broadcast isn't going to work, as the one for European DBT is the one that's been hacked as a SDR.

Do a seach for RTL SDR, or R820T tuner or sdr and you can find these sticks all over eBay, Amazon, and whatnot. They average around 10-15 dollars in cost, tune from 24 to 1. something ghz, and can see upwards of 2mhz in bandwidth.

 
Add a Panadapter to the IC7000  
by WB6MMJ on June 4, 2014 Mail this to a friend!
I have one of those dongles but have been unable to get it working.
This is all new to me and it would be nice to see what software you need to make the dongle work.
I have the software that came with it but so far, no luck.
I`m using HRD with my FT 950 and I`m starting to think it is keeping me from getting the dongle working right. Could you explain in detail what you have done with software ?
Thanks.
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 4, 2014 Mail this to a friend!
Here is a good site to get you up and running. Let me know what operating system you are using. I believe the only difference is what version of Zadig you install.

http://www.rtl-sdr.com/rtl-sdr-quick-start-guide/

Are you planning on using the tuner as a panadapter on the FT950?

Be advised, not all radio's have the IF available without "tapping" the circuit board.

Max
VE3TMT
 
RE: Add a Panadapter to the IC7000  
by WB6MMJ on June 4, 2014 Mail this to a friend!
Hi Max,
I`m using Windows 7. I have a HP desk top.
I put the page you recommended in my favorites to go through when I get a little time.
Thank you for that.
I plan to use this with my FT 950.
From what I understand, I can tap the 1st IF and run it to the dongle antenna input.
I have SDR Sharp software already loaded in my computer.
I also have HDSDR loaded, if I choose to use it.
I`ll keep trying to get this going.
It seems to be a very good, inexpensive, way to have a pan adapter for your radio.
I have watched some of the youtube video`s and it works great.
I just need to get my computer skills updated. LOL
Thank you,
Randy


 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 4, 2014 Mail this to a friend!
Hi Randy,

I don't believe you can use SDR# as a panadapter. I don't think you can set it up to sample an IF frequency.

If you have installed any software that came with the dongle, uninstall it. If you previously installed drivers for the dongle, go into the control panel and uninstall them.

Then plug the dongle into the USB port it will be using.
Allow windows to install the drivers for it.

Then go to http://zadig.akeo.ie/ and download the Zadig utility for "Windows Vista and later"

When you inserted the dongle into the USB port, you may have seen some boxes pop up, something to the effect "Bulk Interface"

These are the drivers you want to replace with the Zadig utility.

Refer to my earliest post about the "Quick Start" site. Instructions for running the Zadig utility are there.

Go to www.hdsdr.de and click on the "HARDWARE" tab. Scroll down and look for the "RTLSDR (DVB-T/DAB with RTL2832)" line. Click on the .dll download link. Copy the extio.dll file into the same folder where HDSDR is installed.

If all is done right and HDSDR recognizes you have a tuner installed, when you start HDSDR, you will see a blue box lit up to the right of the frequency display that says EXTIO. If the box is highlighted, the software recognizes the tuner. If not, it doesn't and we'll go from there.

If you click on this box it brings up the adjustment for tuner gain etc.

This is the first step, at this point the software knows you have a tuner installed.

Next step is to set up the software to work with your IF frequency.

Max
 
RE: Add a Panadapter to the IC7000  
by WB6MMJ on June 4, 2014 Mail this to a friend!
Ok, Max
Thank you.
I will give all of this a try.
You have been very helpful and thank you for your time on this.
Randy.
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 4, 2014 Mail this to a friend!
Randy,

Send me your email address.

Max
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 5, 2014 Mail this to a friend!
Hey Randy,

I've seen some articles about buying the RF Space IF-2000 interface board but I'm not sure you need to go that route.

The 69.450 MHz first IF signal is available at the junction of C1543 and D1060 on the 950's MAIN board. The signal is taken before the roofing filters. I have pictures of where to find the tap, etc. but not sure how to upload them here.

The dongles will easily handle this IF. So all you need is the IF signal going into the dongle, setup HDSDR to use a 69.450 IF and you're in business. You fine tune each mode individually after that, but that's a fairly easy process.

Using the IF-2000 interface may guarantee you a certain panadapter bandwidth on your screen, but any good sound card capable of sampling 96KHz or higher will do the job.

Max
 
Add a Panadapter to the IC7000  
by AF4RK on June 6, 2014 Mail this to a friend!
7100 has similar IF frequency. Might be a possibility for my radio. But it's still under warranty! I have the Noolec unit. It's a very hot little receiver. I use it for VHF scanning with SDR#. If I can find a service manual I might try this!
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 7, 2014 Mail this to a friend!
Taking a look at the IC7000 schematic, the tap point would appear to be at the junction of D502 and D503 on the MAIN BOARD. IC401 is the 1st mixer. This junction is on the output of the mixer before the filter.

The IF frequency is 124.487 MHz.
 
Add a Panadapter to the IC7000  
by WA7PRC on June 8, 2014 Mail this to a friend!
Two questions for the OP (or anyone who knows the answers):

1) How far down from peak response is the response at 48 KHz BW?

2) How do you deal with the gain going up/down w/ changing AGC from strong signals in the passband?

I expect the answers are:

1) Many dB. In other words, it's actually narrow because of the rig's 1st IF roofing filter. This makes it impossible to see any significant bandwidth.

2) You don't - you live with it. That makes it difficult to see weak stations.

vy 73 es gl,
Bryan WA7PRC
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 8, 2014 Mail this to a friend!
Bryan,

The tap is taken before the roofing filters. This provides the widest possible bandwidth.

Many times I can hear stations on the 990 that I can't hear on the dongle. This is a minor trade off as my main use is the panadapter.

Max
VE3TMT
 
RE: Add a Panadapter to the IC7000  
by WA7PRC on June 8, 2014 Mail this to a friend!
Thanks Max,

Then, the limit isn't a paltry 48 KHz BW. Likely the BW limit is set by whatever is connected to the 1st IF.

When I used the Heath SB620 w/ my SB102, the bandwidth was about +/- 50 KHz, limited by the bandwidth of the rig's preselector. Later, when I married the '620 to a Kenwood TS120S*, I was limited only by the rig's LC bandpass filter on the frontend. I could've swept the entire 500 KHz wide band. The itty bitty 3" CRT on the '620 was the limiting factor! Today, my TS850 has a wideband IF output at 8830 KHz. 60 dB of gain makes it work with the '620.

In all cases, the changing receiver AGC causes the level into the panadapter to go up/down. An expander amplifier would fix that. The Analog Devices AD603 looks like a suitable VGA.

vy 73
Bryan WA7PRC

* Yes, it can be done!
 
RE: Add a Panadapter to the IC7000  
by VA3DXV on June 9, 2014 Mail this to a friend!
I did the same thing with the first IF of my TS-570.

HD-SDR+HRD gives me clickable tuning across the spectrum.

https://www.youtube.com/watch?v=CarqHPBPnJI
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 9, 2014 Mail this to a friend!
Hi Brian,

Nice display. What did you use to tap the IF? Cap value?

Bryan,

I do notice sometimes the level jumping up and down. Not enough to disturb the display, but would be nice to get rid of that.

Max
 
RE: Add a Panadapter to the IC7000  
by DH1KLM on June 19, 2014 Mail this to a friend!
I have made the IF tap on the collector on Q502, which is the 1st IF-amplifier.
Experimented a lot with various caps, but there is always a loss in RF gain. (2-3 S Units)
The reason for this behavior is maybe a impedance difference. Next step is to try a buffer amp like
the well known Z10000 from Clifton Labs or from
G4HUP http://g4hup.com/PAT.htm.

Any comments why the IF tap you mentioned (D502 D503)
is maybe the better way?

73 de Sigi, DO1KLM
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 19, 2014 Mail this to a friend!
The location I mentioned is only where I would have tried. It is possible there is a better location. I am surprised by the amount of loading of the IF you are experiencing. I think the buffer is a good idea. I used one many years ago when I had a tap in my TS2000. Had same issue.

Max
 
RE: Add a Panadapter to the IC7000  
by DH1KLM on June 19, 2014 Mail this to a friend!
just looking at the schematics where Terry tapped the IF. Seems he made connection to the 1st IF where already some filtering is done. When i am right there is a BPF in between. Good or bad?
Asking this questions since i am not that electronic Guru like many others, but still learning. I like to find the best location to grab the 1st IF.

73
Sigi
 
RE: Add a Panadapter to the IC7000  
by VE3TMT on June 19, 2014 Mail this to a friend!
Sigi,

From my experience you want to grab the signal before any filtering.

Max
 
RE: Add a Panadapter to the IC7000  
by DH1KLM on June 21, 2014 Mail this to a friend!
Thank you Max,
i also think filtering the IF at this point is not necessary and maybe not a good idea.

When receiving my buffer amp. I will give the tap point
you mentioned a try.

73 de Sigi, DO1KLM
 
RE: Add a Panadapter to the IC7000  
by WA7PRC on June 22, 2014 Mail this to a friend!
VE3TMT: "From my experience you want to grab the signal before any filtering."

Yes. Any bandpass filter ahead of the Panadapter negates the point of it.

My Kenwood TS850S has TWO 2nd mixers. The first 2nd mixer takes the output of the 1st mixer after the roofing filter and passes it (8.83 MHz output) down the receiver chain. The second 2nd mixer (the "Noise Blanker Mixer") takes the output of the 1st mixer before the roofing filter and passes the wideband output (8.83 MHz output) to the noise blanker. It also feeds a BNC jack on the rear panel.

I've connected my olde Advantest R4131B SA to it but also my Heath SB-620 'Scanalyzer'. With the '620 frontend switched to operate as a mixer instead of an amplifier, it needs a BUNCH of gain to see the output of the TS850. Four MMIC amplifiers daisy-chained works.

25 years ago, my older TS120S & TS130S rigs (single conversion) needed a 15 dB gain buffer amplifier added after the mixer to drive the SB-620. I noticed no degradation of receive function (the buffer has a Hi-Z input, and the pickoff point is Lo-Z).

vy 73,
Bryan WA7PRC
 
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