Icom IC-9700 users topic

Transceiver mods, fixes, issues, reviews
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VK3ZAZ
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Re: Icom IC-9700 users topic

Post by VK3ZAZ » Mon May 06, 2019 6:39 pm

VK3BA wrote:G'day Steve,


Steve, I'll drop in over the next few weeks, we'll smoke a pipe & sip a sherry together and reflect on the birth of the IC-9700... :angel:

Cheers,
Good job

BYO glasses Ive got the grog and I will let you play with the RC28 and remote from where we sit in DX heaven.'

You are correct it has more attributes than deteriments.

Investigate the IP+ advanced intercept point
and preamp also all filters variable
Dual bandpass.

SCope is brilliant you can set it up to look at 600 kHz of 2m see all the beacons all the morning rush crowd even saw some guy testing today on 144.120
No birdies can hear an ant fart at 400 km

Cant use radio memories in remote
band edge rolls over to next band up or down which is bizarre.
so entering 99 repeaters yet again as csv don't fit.

https://www.facebook.com/photo.php?fbid ... -a5OI3CXkX


cul
Tread your own path :om:

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VK4GHZ
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Re: Icom IC-9700 users topic

Post by VK4GHZ » Tue May 07, 2019 12:24 pm

FYI...

Glen, VK1XX, is developing an externally locked solution for the IC-9700.

http://www.cortexrf.com.au/IC9700lock.html
Last edited by VK4GHZ on Tue May 07, 2019 12:29 pm, edited 1 time in total.
Adam, Brisbane
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Image Waiting for the perfect 2/70/23 multi-mode SDR transceiver

VK7HH
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Re: Icom IC-9700 users topic

Post by VK7HH » Tue May 07, 2019 12:27 pm

VK4GHZ wrote: Glen, VK1XX, is developing an externally locked solution for the IC-9700.
Thanks Adam. I had a look at Glen's solution... the surgery on 0402 parts doesn't sound like it's for the faint of heart.

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VK4GHZ
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Re: Icom IC-9700 users topic

Post by VK4GHZ » Thu May 09, 2019 3:45 pm

Glen, VK1XX, has posted an update.
VK1XX wrote: 8 May 2019

I have taken a look at the locking method in the IC7610. It's essentially the same thing we are doing- they have a oddball frequency oscillator for all the clocks (actually it is not oddball, it's a audio sample rate multiple) and they lock it to a decent internal or external 10 meg reference ... 

The approach they need to take is DIFFERENT from the IC7610. Which leads me to think Icom dont actually have experience with doing it this way. Anyway, we'll see if Icom get this sorted.

They might implement a frequency counter in the FPGA (which is easy ), the counter is driven from their 49.152 derived clocks. At some period, perhaps a 10 times per second , the frequency count is sent to the microprocessor, and the micro runs some filtering and a PID loop, and drives the VCXO as required. Getting enough error information at 10 times a second on a small error means a rolling window of counts which essentially produces a high sample rate of errors that can be averaged. The high rates of update are required to be able to follow the drift when the fan starts and stops. 

...and Icom if you do a HW rev, you need to isolate the copper pours under the oscillator so it doesnt follow the bottom and top layer copper temperature.... 
Adam, Brisbane
http://vk4ghz.com | VK4GHZ on Youtube
Image Waiting for the perfect 2/70/23 multi-mode SDR transceiver

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