UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Midland Portapack 77-805 CB power meter problem

Damo666 · 22nd Sep 2017, 10:36 am

The layout of yours is completely different to mine, and I also notice that the matching at the telescopic antenna output stage is different.

I've done a bit of Googling around, and the only difference I can decipher between my model and yours is that yours has a "9" position marked on the channel selector, and the component layout is different - otherwise they're both 77-805 Portapacks and have the same technical specification.

It's looking like I'm just going to have to suck up this TX meter false reading problem and just keep my fingers crossed that there's not an actual antenna mismatch when used portable.

I've done some quick field strength tests with a couple of other 4W handheld rigs I have here by using a field strength meter located exactly 4 feet away, and field strength from the Portapack is as good, if not slightly better, than that from the handheld's at exactly the same test distance - so perhaps I'm just being fussy. A mismatch would surely yield a lower field strength?

22nd Sep 2017, 10:36 am	#13
Damo666 Hexode Join Date: Jan 2010 Location: Blackburn, Lancashire, UK. Posts: 399	Re: Midland Portapack 77-805 CB power meter problem The layout of yours is completely different to mine, and I also notice that the matching at the telescopic antenna output stage is different. I've done a bit of Googling around, and the only difference I can decipher between my model and yours is that yours has a "9" position marked on the channel selector, and the component layout is different - otherwise they're both 77-805 Portapacks and have the same technical specification. It's looking like I'm just going to have to suck up this TX meter false reading problem and just keep my fingers crossed that there's not an actual antenna mismatch when used portable. I've done some quick field strength tests with a couple of other 4W handheld rigs I have here by using a field strength meter located exactly 4 feet away, and field strength from the Portapack is as good, if not slightly better, than that from the handheld's at exactly the same test distance - so perhaps I'm just being fussy. A mismatch would surely yield a lower field strength?