Icom Ic-7000

[2E0EKF]

Finally we get a 70MHz allocation here in PA land. I am going to hookup my pa to my modded IC7000, and try to make some 'firsts' on 1 januari 2012
Yipieeee!

Just saw your post and i will listen out for you at midnight on January 1st i hope to work you!

Okay, Lets try. The allocation is valid from 01-01-2012 0:00 Local time. That is @ 23:00Z May be we can Sked something at 70.140 @ 23:10Z? Prefer CW. What is your Locator? (here it is JO21PT)

Hi

I can't do CW, only SSB. I will be on 70.200 at midnight your time first. Then after if i work othjer stations i'll call out for you yes?

my Locator is: JO01BO

[PA7FA]

Finally we get a 70MHz allocation here in PA land. I am going to hookup my pa to my modded IC7000, and try to make some 'firsts' on 1 januari 2012
Yipieeee!

Just saw your post and i will listen out for you at midnight on January 1st i hope to work you!

Okay, Lets try. The allocation is valid from 01-01-2012 0:00 Local time. That is @ 23:00Z May be we can Sked something at 70.140 @ 23:10Z? Prefer CW. What is your Locator? (here it is JO21PT)

ok I'll be there at 2301Z (need to kiss my wife first) hi.

Hi

I can't do CW, only SSB. I will be on 70.200 at midnight your time first. Then after if i work othjer stations i'll call out for you yes?

my Locator is: JO01BO

[2E0EKF]

Well i called out many times, nothing heard from PA...which is strange...

[PA7FA]

Well i called out many times, nothing heard from PA...which is strange...

Selim,

Pity, had a qso with LX, and Germany Nothing from 2E.

Next time better. HNY!! Thnaks for trying.

[M0AFJ]

Selim, it's just as I expected, it's not going to be easy to work PA on a flat band, the east coast guys might do it. The PA guys are not hearing our beacons, how do you expect them to hear a 25 watt SSB signal?, it's going to take a bit of patience.

[2E0EKF]

Selim, it's just as I expected, it's not going to be easy to work PA on a flat band, the east coast guys might do it. The PA guys are not hearing our beacons, how do you expect them to hear a 25 watt SSB signal?, it's going to take a bit of patience.

Well just saying that, i just woke up, turned on my radio and i heard PA2M calling CQ on 70.200 and i worked him! Quite suprised with this.

[M0AFJ]

Well done!

[UY5ON]

In May. June, going to visit the home of his wife Mr. Narva. Estonia ko49bj
es4/uy5on
information is needed to modernize the icom 7000 for work on 4 meters.
That it is easier to get into ... inside the transceiver or transverter to do ... but this is the first decision yet .. under what scheme do?
Pse info via uy5on@yahoo.com

[RD1AP]

Hi friends!
I present my solution of problem 70 MHz in IC-7000. I wanted to maximally simplify everything (on photos). In this case I obtained 47 watts on 70 MHz, and preserved all parameters on 144.
73!

http://narod.ru/disk/43812915001.4f3d2c ... p.zip.html

[MI0BDZ]

Hi RD1AP / OH2FUW,
I have tried to find your name from QRZ but I could not find it. Sorry if I can`t address you personally.

Thank you for taking the time to share this fantastic modification with us. I know some years ago someone suggested that with a little skill it would be possible to solve this problem by modifying the filter. It appears that you have done this.

The shift register positions for the 0.1-200 mhz wideband TX are available from mods.dk November 28, 2005. I believe this is required too.

Just out of curiosity, could you state if the parts you used were 0402, 0603 or 0805, 50v or 200v? also did you model the filter on multi-sim or similar?

There would likely be a demand for this mod as the radio is so sensative on 70mhz RX. I can`t see an easier way to get a multi-mode radio with good TX and RX. (I am guessing you have tested to see if the 47 watts you are getting are really all going out on 70mhz. The ic-706 before it had a lot of people fooled when they saw 25watts going out on what they thought was 70mhz but instead was the IF frequency and 70mhz together around 140mhz.)

Thanks again for this information. This is the most fantastic modification I have seen for a 70mhz radio since Marc Vlemmings /PA1O, released BPF information on the FT-847. If it is repeatable then you will have made a lot of people very happy.


Thanks very much and 73`s

Mark (mi0bdz)

[MI0BDZ]

Hi again,
I have just opened my ic-7000. I studied the circuit board for ages before I realised that there are subtle differences betweem my board and the board in the pictures.

It is not a problem though. My board appears to be a slightly later version. I know this because this newer board appears in the Icom ic-7000 service manual addendum Jan 2010 p28/307.

C17 is closer to the four legged ic2 on this board, in fact c17 is in between the two short legs. C33 appears to be in an almost identical position on both version boards and is easily identified.

I have made the board 22mmx9mm and I am waiting for the parts to arrive from RS.

I nearly forgot to mention that you will first have to detatch a ribbon cable then remove a small metal screen which covers the offending parts. It is attached to the board at three solder points. (solder wick is good here).

The shift register diode bank is located under the cpu unit. The cpu unit is located diagonally across from the fan, under the top cover of the radio (pink rectangular pad on top of it). It is secured with two self tapping screws. The cpu unit then unplugs by lifting it up.

Wide band TX involves you removing three diodes from the left bank leaving only D2170. This enables TX on 70mhz. Thanks again to our Russian friend RD1AP / OH2FUW.

73`s
Mark

[RD1AP]

Hi dear friends!
Dear Mark (MI0BDZ) please, if possible, stop the experiment with my design. I have just returned from Europe, where tested transmitter in "real" work and not very pleased with the result. I could not be tested previously because the range of 70 MHz in my country is prohibited. On weekends I go to friends and using the exact instruments can test the transmitter and to understand what was happening. I will publish its report in the forum, I hope for your understanding.
73!

[MI0BDZ]

Hi Igor,
I have built the filter tonight but have not yet fitted it to the radio. I would be tempted to try it but the thoughts of having to refit the two tiny capacitors c17 and c33 back again has led me to wait for your tests to be completed.

These things happen Igor! If it turns out to be unsuccessful then that is fine. It was definately worth a try.

For your information and anyone else who might be interested, I have widebanded the radio already and it keys up on 70mhz.

The radio appears to put out more than 20mw in to my dummy load but guess what, its not putting it out on 70mhz. Keying on ssb produces a 20mw carrier that barely moves with a whistle.

There is a very low level signal there though. I am guessing it is less than 1mw simply because my friend who lives 2 miles away can hear a 1mw signal quite clearly from my HP 8656b signal generator and he can`t hear anything from the ic-7000 with an indicated 30mw carrier in to a 5/8 wave ringbase. Time to stop transmitting then!

you can hear us talking at another time if you look for my home made transverters on youtube. Just type in my callsign

Thanks for the information Igor. I look forward to hearing from you soon. All the best and thanks for trying.

73`s Mark (mi0bdz)

[RD1AP]

Hi friends!
Hi dear Mark!
In the last weekend I made ​​the necessary measurements, and I can confidently say that my filter is a big mistake. In the output signal contains the following components: 70 MHz (the level of 36 dBm), 124.487 MHz (the level 34 dBm), 140 MHz (the level 46 dBm). Thus the power of the desired signal (70) is only 4 watts, and the emission of harmful products of 43 watts which is unacceptable. I'll try to make two filters with an external switch to a relay (70 and 144) and configure the transceiver using the instruments.
Best regards, 73!

[MI0BDZ]

Hi Igor,
You have obtained some interesting facts about the output of the modified ic-7000. The first IF is 124.487Mhz, this is obviously where 34dbm (2.5 watts) is going.

70Mhz gets 36dbm (4watts) but the remaining power is somewhat of a mystery to me. 40 watts is the output on 140Mhz.

I wonder if this frequency is somehow being generated by doubling the 70mhz (perhaps a modification at this stage could help) and because it is close to the 144mhz passband, is easily amplified to this output level because the vhf TX stage and pa`s are used for the 70Mhz mod and output is switched to the VHF socket past 60Mhz.

I am just guessing here. Who knows how the radio is generating all of these frequencies.

Please let me know how you progress with the new filter idea Igor. Thanks for the quick reply about your results, very informative.

73`s

Mark