Search found 1794 matches

by VK4GHZ
Tue Aug 20, 2019 10:09 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 608
Views: 61207

Re: What's on your Workbench?

@Adam vk4ghz Just a simple stupid question : is your Eltek Flatpack control board for Aussie market only ? I tried to follow the shop's procedure but the form kicked me out for a "bad or missing address" reason Cheers Marc f6itu Nobody should be ordering anything - it's not even set up properly yet...
by VK4GHZ
Mon Aug 19, 2019 5:12 pm
Forum: Transceivers, Transmitters & Receivers
Topic: Icom IC-910 circuit help
Replies: 19
Views: 2500

Re: Icom IC-910 circuit help

Steve, funnily enough no one has specifically mentioned the designator of the part in question... but if it's the FET on the DRV board, it's Q930, a 2SK2975 FET. Click on the attachments for full-size. 910-drv.PNG 910-drv2.PNG 910-drv3.PNG Australian source FWIW: http://semico.com.au/index.php?optio...
by VK4GHZ
Mon Aug 05, 2019 9:56 am
Forum: 1296, Microwaves and Opto
Topic: 2.4 GHz contact in Southern Tasmania over mountains
Replies: 6
Views: 211

Re: 2.4 GHz contact in Southern Tasmania over mountains

And if you haven't seen it already, the 23cm SG transverter was discussed here: http://vklogger.com/forum/viewtopic.php?f=40&t=12105
by VK4GHZ
Mon Aug 05, 2019 9:52 am
Forum: 1296, Microwaves and Opto
Topic: 2.4 GHz contact in Southern Tasmania over mountains
Replies: 6
Views: 211

Re: 2.4 GHz contact in Southern Tasmania over mountains

Hi Grant There is a great repository of information here that has been posted in the past. 2.4 GHz grid pack discussed here before. Try reading: http://vklogger.com/forum/viewtopic.php?f=40&t=9617 It's such a shame so many prefer the ease of posting on Foolbook these days - but try finding things on...
by VK4GHZ
Thu Jul 25, 2019 2:10 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 608
Views: 61207

Re: What's on your Workbench?

Back one page I posted images of a 3D render of an Eltek Flatpack2 controller project PCB. The PCBs arrived from the fabricator weeks ago, and I've (finally!) managed to find some time to assemble a controller board. http://vk4ghz.com/wordpress/wp-content/uploads/DSC6443_900.jpg More images and deta...
by VK4GHZ
Thu Jul 18, 2019 5:40 pm
Forum: 1296, Microwaves and Opto
Topic: 23 on 23: Tuesday July 23rd 2019
Replies: 10
Views: 420

Re: 23 on 23: Tuesday July 23rd 2019

I'm looking for my first QSO with the IC-9700.

No usable yagi up for 23cm (actually the issue is the feedline), so vertical for me.

Anyone who'd like to call, I'll be listening on 1296.0 FM, as well as the neglected VK4RMC repeater on 1273.500 (1293.500 in).
by VK4GHZ
Tue Jul 16, 2019 12:36 am
Forum: Transceivers, Transmitters & Receivers
Topic: Icom IC-9700 users topic
Replies: 146
Views: 8315

Re: Icom IC-9700 users topic

No, those screen shots above is the actual PTT switch contact from the mic (with a pull-up resistor to 3V3).
In other words, straight out of the mic.
by VK4GHZ
Mon Jul 15, 2019 9:50 pm
Forum: Transceivers, Transmitters & Receivers
Topic: Icom IC-9700 users topic
Replies: 146
Views: 8315

Re: Icom IC-9700 users topic

Thanks Peter. :thumbup: Not what I was expecting, but extremely effective! Could not make the HM-219 PTT bounce at all. All the newer Icom hand microphones & rigs power their electret mic insert via mic socket pin 1 (MICI) which has DC volts on it. In the old days, the microphone derived its power f...
by VK4GHZ
Mon Jul 15, 2019 8:52 pm
Forum: Transceivers, Transmitters & Receivers
Topic: Icom IC-9700 users topic
Replies: 146
Views: 8315

Re: Icom IC-9700 users topic

Has anyone pulled their HM-219 hand microphone apart?
(Stock mic that comes with the IC-9700)

I haven't, but there is obviously some logic in there to eliminate PTT switch bounce.

HM-219.png
HM-219 PTT bounce. RX > TX - none!

Compared to an old HM-36:
HM-36 Bounce.png
HM-36 PTT bounce. RX > TX - almost 800uS of contact bounce


The old SM-8 is even grottier.
SM-8 Bounce.png
SM-8 PTT bounce. RX > TX - almost 10mS of contact bounce
by VK4GHZ
Thu Jul 11, 2019 2:07 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 608
Views: 61207

Re: What's on your Workbench?

by VK4GHZ
Fri Jul 05, 2019 10:19 pm
Forum: Satellites & Balloons
Topic: Satellite ops with IC-9700
Replies: 7
Views: 375

Re: Satellite ops with IC-9700

VK6XLR wrote:
Fri Jul 05, 2019 9:51 pm
SatPC32 keeps the 9700 on Main band and briefly selects Sub band to set new frequency. So most times it'll be the Main band that selected.
OK.
The sequencer requires the bottom band (TX) is selected (white) before going into transmit.
That means SAT32PC won't be compatible with this.
by VK4GHZ
Fri Jul 05, 2019 2:29 pm
Forum: Satellites & Balloons
Topic: Satellite ops with IC-9700
Replies: 7
Views: 375

Re: Satellite ops with IC-9700

Hi Rick

I'm aware which is RX (top) and TX bands (bottom)!

I am trying to ascertain WHICH BAND is SELECTED (ie: WHITE not GREY) immediately before you go into transmit.
Can you make a note of that please, and let me know.
by VK4GHZ
Thu Jul 04, 2019 11:08 pm
Forum: Satellites & Balloons
Topic: Satellite ops with IC-9700
Replies: 7
Views: 375

Re: Satellite ops with IC-9700

Thanks for the reply Jayson. Let's do this visually! Click on the attachments to see explanation text full-size. 20190704_224552_1200.jpg 20190704_224539_1200.jpg The operator will need to (manually) ensure that the bottom TX band is selected before transmitting, so that CI-V reports the correct fre...
by VK4GHZ
Thu Jul 04, 2019 7:37 pm
Forum: Satellites & Balloons
Topic: Satellite ops with IC-9700
Replies: 7
Views: 375

Satellite ops with IC-9700

Any satellite ops here that have an Icom IC-9700? Need to pick your brains on how you actually operate the 9700 during this operation. Do you tune around on the "sub" band; (the TX band displayed in the bottom half), or do you tune around on the "main" band (the RX band displayed in the top half). O...
by VK4GHZ
Thu Jul 04, 2019 9:03 am
Forum: Transceivers, Transmitters & Receivers
Topic: Icom IC-9700 users topic
Replies: 146
Views: 8315

Re: Icom IC-9700 users topic

IC-9700 test report by Adam Farson VA7OJ/AB4OJ.

IC-9700 VA7OJ Test Report.pdf
(3.01 MiB) Downloaded 92 times
:popcorn:
by VK4GHZ
Thu Jun 27, 2019 1:23 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 608
Views: 61207

Re: What's on your Workbench?

The joys of working with SMD! This is a TSOP6 package (2.9 x 1.3mm) with a lead pitch of 0.85mm. 20190627_1200.jpg New hardware addition to the SEQ-9700 sequencer production prototype... about to be mounted dead bug style for evaluation. 12x diopter maggy lamp lens and extra strong reading glasses a...
by VK4GHZ
Wed Jun 26, 2019 7:07 am
Forum: WSJT
Topic: WSJT USB Audio Sources???
Replies: 13
Views: 706

Re: WSJT USB Audio Sources???

Hello Adam, did you find an answer to the audio device issue? Hi Peter. No, I gave up on it for now - too many other things on the go. In addition to previously mentioned, I also installed VBCable, and then uninstalled it. I also cleaned the Windows registry a number of times, and still no joy. Alt...
by VK4GHZ
Wed Jun 19, 2019 12:13 pm
Forum: Transceivers, Transmitters & Receivers
Topic: Icom IC-9700 users topic
Replies: 146
Views: 8315

Re: Icom IC-9700 users topic

More from Glenn, VK1XX.

Drift plots: http://www.cortexrf.com.au/IC9700drift.html

:popcorn:
by VK4GHZ
Mon Jun 17, 2019 8:17 pm
Forum: Transceivers, Transmitters & Receivers
Topic: Icom IC-9700 users topic
Replies: 146
Views: 8315

Re: Icom IC-9700 users topic

Glenn, VK1XX, has provided a schematic, BOM, gerbers, etc for his IC-9700 ref lock project. http://www.cortexrf.com.au/IC9700lock.html http://www.cortexrf.com.au/3d.gif 16 June 2019 3D rendition of PCB with tooling strips attached for mfr. The boards will be back from fab ~ 18 June. It is a 2 layer ...
by VK4GHZ
Mon Jun 17, 2019 8:59 am
Forum: Transceivers, Transmitters & Receivers
Topic: Icom IC-9700 users topic
Replies: 146
Views: 8315

Re: Icom IC-9700 users topic

Here is yet another solution: inject GPS locked 49.152MHz AC-coupled signal into the the output of the X8601 VCTCXO without shutting it down. I have used 0.1uF 0603 for AC coupling and mini GPS clock - set at 49,152,000Hz and 8mA drive. VCTCXO seems to become either parasitic injection locked to ex...