Magnum s45HP SSB

[Se7en]

FM audio sucks, plain and simple.
apparently on SSB with mic gain at 12 clock, RF power at lowest point no RF swing, turn up RF power knob more sing....... turn it up ....and...... you have a DK on SSB even with the mic gain at ZERO. how is this possible? and i have confirmed it with 4 others here with SSB and FM all with the same results.
how ever, AM is a talker+loud! and absolutely no issues..... yet :mellow:

 

[ExitThirteen]

Sounds like the carrier balance is out of alignment, I'll post again once I get Adobe Reader updated, so I can view .pdf files, I can tell you what you can do to adjust the SSB carrier balance so you don't have a carrier on SSB (provided that's the problem).

As far as FM goes, is it too "overmodulated" (over-deviating) or "undermodulated" (under-deviating)? I'm pretty sure there's an adjustment for that also, which I can include in my next post.

Did you have anyone tune it up?

Just wondering.

~Cheers~

 

[ExitThirteen]

Looks like RV801 adjusts the carrier balance for SSB. Adjust that to where there is no carrier on LSB, then switch to USB to make sure there's no carrier on USB.

RV106 controls FM deviation (FM "modulation"). Adjust that for FM.

Hope this helps!

~Cheers~

 

[Robb]

if it is new; send it back to Magnum.
Preserve your warranty status . . . Don't open it up . . .

 

[ExitThirteen]

Robb is 100% correct. If hasn't been opened (which is why I asked if anyone's tuned it or not), send it back to Magnum, and tell them the issues. They should fix it under warranty.



~Cheers~

 

[Se7en]

i donot see a RV801 anywhere.....

 

[IMD262]

Wasn't this radio " Sparky-Tuned "

 

[Se7en]

NO. i tuned AM only. ssb was fine and never did notice the ssb isssue untill someone brought it to my attencion.
i rarely use SSB anymore. but decided i would check to see if what soimeone told me was true and sure enough. why i didnt catch it on the scope...

 

[TonyV225]

The deviation adjustment is commen I dont know why but these manufactures have a hard time setting this. Galaxy was huge for this being horrible at how their radios sounded on FM and yet its a simple adjustment. I understand most people dont use FM but for what it takes to adjust it why not just do it!!?? I had adjusted some that were way off and the recieve wasnt even understandable.

 

[ExitThirteen]

Interesting. The manual says to adjust RV801 on the Balanced Mod module for SSB carrier balance, but upon looking at a parts layout of the board, that's incorrect, I apologize. I believe the one you need to adjust is VR107 for SSB carrier balance. Should be about center of the board by a small metal can and a single inline pin (SIP) IC chip. Good luck!


~Cheers~

 

[Se7en]

no vr107 in the center of the board. is it yellow pot or a silver pot?

 

[ExitThirteen]

It'd be a yellow top, I believe. In the middle of the board, maybe a little towards the front.

~Cheers~

 

[hotrod]

FM audio sucks, plain and simple.
apparently on SSB with mic gain at 12 clock, RF power at lowest point no RF swing, turn up RF power knob more sing....... turn it up ....and...... you have a DK on SSB even with the mic gain at ZERO. how is this possible? and i have confirmed it with 4 others here with SSB and FM all with the same results.
how ever, AM is a talker+loud! and absolutely no issues..... yet :mellow:

where did you setup the gain in the stock mic at?i find its much more potent
to open this wide open you,ll know what way to go audio drops off quick
when turning it down, why i left mine wide open.the carrier you see
sounds like a rf coming thru friom somewere but i dunno. if your carrier
balance was outta adjustment id think it would show that reguardless
where the power is.can the power supply handle the radio?

 

[Se7en]

where did you setup the gain in the stock mic at?i find its much more potent
to open this wide open you,ll know what way to go audio drops off quick
when turning it down, why i left mine wide open.the carrier you see
sounds like a rf coming thru friom somewere but i dunno. if your carrier
balance was outta adjustment id think it would show that reguardless
where the power is.can the power supply handle the radio?

iv tried everything externaly even none powered mics all with the same problem on ssb. well the VR107 or RV107 cannot be found so. i have no choice but to box it up and send it back.

 

[hotrod]

b4 ya send it back id call rflimited and see what they have to say.
probaly tell ya to send it to chris holland .but thatsjust what id do