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February 26, 2021, 01:35:33 am

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V8R4 receiver - detached aerial fix

Started by Phil_G, April 29, 2012, 22:37:03 pm

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Phil_G

April 29, 2012, 22:37:03 pm Last Edit: May 04, 2012, 06:56:42 am by Wiz
Maybe I'm the only one left still buying one-way gear but I've been using it since helping with beta testing and like all my Frsky gear the V8 stuff has been supremely reliable.
I've seen a few posts from people who had detached V8R4 antennas, but never paid much attention until I received my last order from the big fish, which included a V8R4 with no aerial at all.
I've fixed it, thoroughly tested it and its 100% so I wondered if the fix might be of interest to others. Unfortunately I didnt take any photos, if it happens again I'll take some.
What I did was to first clean off all the 'goo' by warming it and gently picking at it. The pcb land to which the aerial should have been soldered appeared to be missing - probably came a way with the aerial - leaving nowhere to resolder a new aerial.
To find the aerial input I set the tx module to low power, set the tx to sweep, got the rx linked up & a servo sweeping, then moved the tx well out of range, way beyond where the rx stopped working (still with no rx aerial).
I then took a 30mm pin, pushed it through some 1/4 square balsa, and under a bench magnifier and with the rx powered up and holding the balsa, touched the point all around the original aerial position. Next to the missing aerial connection I found that at the junction of two SMT components, touching the pin gave an instant link, removing it dropped the link. I switched off, soldered a 33mm length of servo wire to the junction of the two components, & switched the rx back on again. Got an instant link, and a low-power range test proved all was back to normal. Checked the solder was a good mechanical joint and applied a good blob of evo-stick to support it. Did a range test on full tx power and ran out of space at half a mile, with rx still working fine at that range. I'm not suggesting all breakages can be as easily fixed but this worked for me. Wish I'd taken photos, too late now but next time I will.
Cheers
Phil

[attachimg=1]

Yoyo

Thanks Phil,

I'm all 2-way, but I may well use that technique when I get to replacing the torn off aerial on one of my D8Rs with a sheared off uFL connector..
Doing what you like is Freedom
Liking what you do is Happiness

Kevin Fairgrieve (NSS)

All of my Frsky stuff is one way.

Why would I need two way?

I know when my plane is over 400ft high, I know when I am low on fuel and I know that my RX pack will allow me a certain amount of flights before recharging.

Anyway enough said. I have not had any issues with quality of my Frsky stuff from GC.
Kev

Norfolk'n'Good

Quote from: Phil_G on April 29, 2012, 22:37:03 pm
I received my last order from the big fish, which included a V8R4 with no aerial at all.
I've fixed it, thoroughly tested it and its 100%


Personally I would contacted GC sent it back and got another  $%&

dbflyer

Thanks Phil, I have had this happen to me due a bit of ham fistedness and I left the rx in a corner of a drawer, now I will have a shot at a repair.  I have been impressed by these little, inexpensive recievers.
If you think you probably can but also think you possibly ca

Phil_G

Quote from: Norfolk'n'Good on April 30, 2012, 10:48:52 am
Personally I would contacted GC sent it back and got another  $%&
I rang them right away, they apologised profusely and sent a replacement on the next post Shaun, I asked if they wanted the duffer back but they didnt, hence the repair, so I got BOGOFF  :af
Cheers
Phil

Norfolk'n'Good

In which case well done you  :af and good advice on a repair on anyones over 12 month old.