VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 10-10-2017, 09:39 AM
Raymo's Avatar
Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 1,807
Default Which VSWR Meter?

I want something to help troubleshoot poor radio transmission issues and found one thread that recommended the MFJ-812B but it is not designed for the VHF frequency range in our radios (108-136MHz).

I'm looking at the MFJ-874 and it is designed for HF/VHF/UHF but quite a bit more expensive than the one Gil recommended.

Any other recommendations from the fleet?
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter, PlanePower Alt
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines
NSDQ

"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army
Reply With Quote
  #2  
Old 10-10-2017, 09:55 AM
DaleB's Avatar
DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,922
Default

MFJ-844, or one of the many similar and less expensive models... like this one. If it's designed for VHF, it will probably be fine at airband frequencies. If you want to get really fancy, the MFJ-259 can tell you whatever you want to know about your antenna and coax.
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
Reply With Quote
  #3  
Old 10-10-2017, 10:08 AM
RV6_flyer's Avatar
RV6_flyer RV6_flyer is offline
 
Join Date: Jan 2005
Location: NC25
Posts: 3,036
Default MJF-259

I have used the MJF-259. It is more expensive but will do just about everything I want in both aviation and amateur radio.
__________________
Gary A. Sobek
NC25 RV-6
Flying
3,300+ hours
Where is N157GS
Building RV-8 S/N: 80012

To most people, the sky is the limit.
To those who love aviation, the sky is home.

Last edited by RV6_flyer : 10-10-2017 at 10:39 AM. Reason: add link
Reply With Quote
  #4  
Old 10-10-2017, 10:08 AM
Raymo's Avatar
Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 1,807
Default

Thanks, Dale. I see the 844 specified frequency ranges 140-150, 430-450MHz

Will this also work in the 108-136 range? The 259 is very nice but more than I'd like to spend at the moment (~$100).
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter, PlanePower Alt
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines
NSDQ

"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army
Reply With Quote
  #5  
Old 10-10-2017, 10:37 AM
N804RV's Avatar
N804RV N804RV is offline
 
Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 387
Default

I use a Workman Model 104 with a couple of BNC male to PL259 adapters. Cheap and works great.

If you're not experienced with coax connectors, or don't want to buy the tools to make nice "low-loss" connectors on RG-400, Aircraft Spruce will sell you custom made coax for your radios. Definitely worth the price!
__________________
Ken W.
Mount Vernon, WA
2018 VAF Supporter
Reply With Quote
  #6  
Old 10-10-2017, 10:40 AM
DaleB's Avatar
DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,922
Default

Quote:
Originally Posted by Raymo View Post
Thanks, Dale. I see the 844 specified frequency ranges 140-150, 430-450MHz

Will this also work in the 108-136 range? The 259 is very nice but more than I'd like to spend at the moment (~$100).
I'd be very, very surprised if it didn't.
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
Reply With Quote
  #7  
Old 10-10-2017, 10:51 AM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,743
Smile Good old thread

Amazing a link in one of my threads from 10 years ago to a product that still exists and is still $39.

http://www.mfjenterprises.com/Produc...uctid=MFJ-812B

The unit I linked to is marketed for the 144 and 22 MHz bands, but the data sheet says it will work down to 21 MHz with reduced sensitivity.

It will have no problem at our aircraft frequencies that are around 120 MHz.

It also appears the front panel marking has changed a bit and is now labelled 114-220 MHz, definitely suitable for aircraft antennae.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ

Last edited by az_gila : 10-10-2017 at 10:53 AM.
Reply With Quote
  #8  
Old 10-10-2017, 11:36 AM
Raymo's Avatar
Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 1,807
Default

Thanks all. I plan to try a few of these low cost units until I can splurge for a Rig Expert Antenna Analyzer, which are pricey but fantastic units.
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter, PlanePower Alt
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines
NSDQ

"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army
Reply With Quote
  #9  
Old 10-10-2017, 12:09 PM
Aluminum Aluminum is offline
 
Join Date: Jul 2017
Location: San Jose, CA
Posts: 193
Default

Quote:
Originally Posted by Raymo View Post
Thanks all. I plan to try a few of these low cost units until I can splurge for a Rig Expert Antenna Analyzer, which are pricey but fantastic units.
If you are skilled at soldering you can build a clone VNA for not much money:

http://www.ebay.com/itm/PCB-for-buil...kAAOSwcLxYFNvQ
__________________
Dan V
'91 Zodiac flying since 2013
RV-14A in progress
2018 dues worth every penny
Reply With Quote
  #10  
Old 10-10-2017, 12:53 PM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 989
Default

You can borrow my bird. Send address
__________________
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS
N164WM
N184WM reserved (RV-8)....tail kit done, slow-build wing done, slow-build fuselage started.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 05:00 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.