-
You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
DX86V
- Thread starter 743SEPA
- Start date
40 down, 11m, 40 up... No 10k switch... I own this and love it!
73's
73's
I received my DX86v yesterday. Here's what I can tell based on initial jumpering of the frequency board:
Band = A 25.615 - 26.055 open
Band = B 26.065 - 26.505 B, +8V
Band = C 26.515 - 26.955 C, +8V <-- "C" after conversion
Band = D 26.965 - 27.405 D, +8V <-- "D" after conversion
Band = E 27.415 - 27.855 E, +8V <-- "E" after conversion
Band = F 27.865 - 28.305 F, +8V
Band = G 28.315 - 28.755 G, +8V
Band = H 28.765 - 29.205 H, +8V <-- default unconverted
So with a standard 3P3T ON-OFF-ON switch, wired to the back of the rig, you could have:
Switch DOWN:
Band C,D,E
Switch UP:
Band F,G,H
Switch middle:
Band A
That allows switching of 7 of 8 bands. Only missing 26.065-26.505..
Of you could use a 3P2T switch and have:
Switch DOWN:
C,D,E
Switch UP:
F,G,H
In my case, the objective is to cover as much of the HAM bands as possible, while keeping CB channels in the standard C,D,E (after conversion) position.
I'm still thinking about creative wiring to cover all available bands..
I read on the DX-66V CB tricks page that it might be possible to change frequency crystal to expand coverage upward to cover the majority of the ham bands, but, I think for Mod 1, I'm going for simply, the 3P2T solution. Or, I might use a 4P3T (if it will fit), and try to use the OPEN position along with the internal switch to switch between band A and the missing band B, there there is coverage of all 8 available bands.
Has anyone else done this? Ideas?
The J3 connector on the band board, I pushed some of the pins out and moved them to D, G and H so the factory front panel switch gives : C= CB channels, D= 28.315-28.755, E= 28.765-29.205. That way I have CB, 10M SSB subband, 10M AM subband.
i found that the power dropped off at the band edges when the radio was modded for lo 40 cb40 and hi 40.
based on what i saw, it seems like this would be a problem if the radio was modded for more than 120 channels.
if you do these mods, please try to even out the power over the wider range and post back with the results.
LC
based on what i saw, it seems like this would be a problem if the radio was modded for more than 120 channels.
if you do these mods, please try to even out the power over the wider range and post back with the results.
LC
From that, it sounds like the front end filters have a narrow bandwidth. Anyone know how to adjust the passband?
These use a "quadrature coil" (L5) and although pretty boardbanded for 10 OR 11 Meter - getting it to handle both is a choice the end user must make.
There is C43 a 18pF cap for the PIN section - but that is the problem, it's the acceptance across the Pin Diode section...
Check the value of that "input cap" to the receive front end.
The above is from the 959
Only giving this to help others determine the routes
and choices on what values to use.
It's operational curve is a lot more like a Superstar 360 - 120 AM/240SSB approach but widening it you will need to work with values around the L6 and L7 Band Pass filter
Keep us posted on any headaches you may have with this.
One thing I do want to caution you on, is also with the VCO.
You have a great little radio with a pretty powerful VCO - but the VCO is only as good as the tuneup done to it.
Most of the time you don't need to do anything - but you may encounter an Aliasing - issue...
As you get further into the "fringes" you run into a problem with running out of "shift"...There are two constants - The Floor - and the walls - the Floor being your workspace - the Walls are being the upper and lower frequency limits of your "Dance" ...
Which means it's an "F" result - for without the "F" in "SHIFT" - your signal turns into ... (do I have to say more?)
Your "Base" frequency stays the same - the ability of the PLL and IF to work together - doesn't because your Main Base - your PLL Clock tends to run out of "spacing" ability - Because your Band Pass is Fixed in width - your IF is also fixed, to obtain the image - your mixing frequency to generate that image at 10.7MHz - is wide and can place itself out of the range of frequency it will allow thru to mix, your Band Pass.
They've come a long way since their BASIC beginnings - but the shift I'm referring to is the PASS BAND the IF uses in the radio - most IF's in Galaxy radios' use the 10.7MHz IF - but the Intermediate Frequency to obtain that IF Shift can place itself out of most Band Pass Filters just trying to mix to get your 10.7 Image of the frequency you want. So Yes to the Band Pass Filters - but I cannot guarantee success for the noise it can pick up with be excruciating to the ears.
One thing I do want to caution you on, is also with the VCO.
You have a great little radio with a pretty powerful VCO - but the VCO is only as good as the tuneup done to it.
Most of the time you don't need to do anything - but you may encounter an Aliasing - issue...
As you get further into the "fringes" you run into a problem with running out of "shift"...There are two constants - The Floor - and the walls - the Floor being your workspace - the Walls are being the upper and lower frequency limits of your "Dance" ...
Your "Base" frequency stays the same - the ability of the PLL and IF to work together - doesn't because your Main Base - your PLL Clock tends to run out of "spacing" ability - Because your Band Pass is Fixed in width - your IF is also fixed, to obtain the image - your mixing frequency to generate that image at 10.7MHz - is wide and can place itself out of the range of frequency it will allow thru to mix, your Band Pass.
They've come a long way since their BASIC beginnings - but the shift I'm referring to is the PASS BAND the IF uses in the radio - most IF's in Galaxy radios' use the 10.7MHz IF - but the Intermediate Frequency to obtain that IF Shift can place itself out of most Band Pass Filters just trying to mix to get your 10.7 Image of the frequency you want. So Yes to the Band Pass Filters - but I cannot guarantee success for the noise it can pick up with be excruciating to the ears.
Attachments
Last edited:
Does anyone know what the driver and final output transistors are in the dx86v? I need to find out what the correct bias current is for them.
When I did the conversion on mine I received the cb band and more as you did.
When I left the wires plugged in and reconnected the two joints I had desoldered with a jumper I received different 10 meter frequencies than original. I have to unplug the original unplugged wires again to receive the original frequencies. What wiring needs to be changed to receive all signals the radio is capable of?
Any help will be appreciated!
When I left the wires plugged in and reconnected the two joints I had desoldered with a jumper I received different 10 meter frequencies than original. I have to unplug the original unplugged wires again to receive the original frequencies. What wiring needs to be changed to receive all signals the radio is capable of?
Any help will be appreciated!
What is different in this radio than other broader bandwidth Galaxies?
It seems like figuring that out first and swaping out those parts would be the first thing to do?
I have been thinking about doing this and was going to ask you guys about this when I found this thread.
It seems to me that the first thing to do would be to use off the shelf Galaxy parts first and foremost to broaden this chassis.
Am I wrong in my thinking?
Thanks guys!
It seems like figuring that out first and swaping out those parts would be the first thing to do?
I have been thinking about doing this and was going to ask you guys about this when I found this thread.
It seems to me that the first thing to do would be to use off the shelf Galaxy parts first and foremost to broaden this chassis.
Am I wrong in my thinking?
Thanks guys!
- No one is chatting at the moment.