Vertex VX4000L -10m / 29MHz programming

[g8tzl2004]

Just wondered if anybody has successfully programmed a low band Vertex VX4000L on 10m / 29MHz FM.

I've search the internet and several people are using VHF and UHF VX4000's but there is no mention of hams using the VX4000L 29.7 - 37 MHz radio on 10m.

 

[g8tzl2004]

Anybody successfully programmed a VX4000 to work across the 10m band. Mine works great above around 29.660MHz but sensitivity drops off a cliff below 29.660

 

[radiotweester]

I had a similar annoyance trying to find info on taking the VX4000L out of band
I tried this with Software version 3.xxx and I wasn't able to locate the values

Using CE49 Ver 5.17 and HxD hex editor
Load the CE49.exe file in to HxD
then Search->
Replace->
Search for-> (first Hex value) Replace with the second hex value

01C52FA0 = 29.7MHz replace with 01C22260 = 29.5MHz
VHF LB A

02FAF080 = 50MHz replace with 0337F980 = 54MHz
VHF LB B

1AD27480 = 450MHz replace with 1A39DE00 = 440MHz
UHF D

Hit [Replace All]
Save and close HxD and open the CE49

I'm assuming with the problem g8tzl2004 is having on 10m, the VCO will need adjusting.

 

[g8tzl2004]

Thanks for the feeback.

Have you successfully programmed your VX4000L onto 10m so that it has good sensitivity across 29 MHz?

Have you checked your sensitivity below 29.660 MHz?

I eventually worked out how to adjust the band limits (I was forgetting to add a "zero" to the start of the hex string...you need 8 digits and if the hex converter only displays 7 you need to add a 0 to the start!!!).

But my VX4000L sensitivity "drops off a cliff" below around 29.660 MHz BUT the radio is still RXing all the way down to 27MHz but its very very deaf - so I don't think the VCO is out of lock. A weak repeater is heard OK on 29.660 MHz but a strong repeater on 29.640 is not heard at all...but the VX4000L is still RXing on 29.640 Mhz..but maybe 30dB down.

I was thinking that the problem was a band pass filter alignment issue where the values were all wrong below 29.660 Mhz due to the out of band programming....BUT maybe its because I used 27 MHz as the band limit rather than 29.5 MHz which is what you are suggesting. Maybe using 27 MHz was too much out of band and has upset all the BPF values??

Is your VX4000L receiving OK on 29.5 MHz - does it have good sensitivity or is it deaf?

Have you tried it on 29.4 MHz?

 

[radiotweester]

Sorry, I've not done a 10m.