Repair Microwave Frequency Counter EIP535. - UK Vintage Radio Repair and Restoration Discussion Forum

mimmo2010 · 8th Jul 2014, 11:39 am

hi, I'm new to the forum, I need help with the repair of the frequency 535B eip, the problem occurs on both band 1 and band 2 can not read fequenze above 85 MHz. Thank you

Station X · 8th Jul 2014, 1:22 pm

Hello and welcome to the forums.

I'm not familiar with this equipment and don't know what it is. You've posted this in both the Domestic Radio and Test Gear sections.

Is it a radio or a piece of test equipment such as a signal generator or frequency counter. How old is it? Can you post some pictures?

Station X · 8th Jul 2014, 1:25 pm

I see from googling that it's a frequency counter. I've moved the thread to the correct section and given it a more informative title.

mimmo2010 · 8th Jul 2014, 1:32 pm

OK, thanks

mimmo2010 · 8th Jul 2014, 11:18 pm

Hello everyone here is the circuit diagram is too large to attach.

http://www.ko4bb.com/Manuals/EIP_Pha...ice_Manual.pdf

Dickie · 9th Jul 2014, 7:49 am

Hi, Welcome to the forum. In order to better help you, can you tell us what test equipment you have available? Do you have any extenders for the plug-in cards?

It ssems odd that the two channels stop at the same frequency. Are you sure the input signal is OK and not fading away at high frequencies. Otherwise it suggests you need to start looking around the circuitry common to both bands, i.e the pulse forming and digital counting circuits after the band selector switching. Is the display accurate below 85MHz?

mimmo2010 · 10th Jul 2014, 12:37 am

hi, I'm checking in fact, I think that 's my oscillator modulated wrong, but I was misled by another frequency that worked for a hp5328a from 500mhz perhaps much more sensitive. Today I tried with a transmitter 432 mhz 5 watt and it works, and perhaps' a bit dull with lower powers.
Thanks for your help

Dickie · 10th Jul 2014, 7:21 am

5W?? I hope you've got an attenuator in there somewhere or you'll blow input B. Then it will be really insensitive! Hope its not too late. Note from the spec. in the manual you posted: "damage level +27dbm" which is 0.5W.

mimmo2010 · 10th Jul 2014, 8:47 am

I'm sorry you're right, but I used an antenna connected to the BNC input, I did not provide adequate instrumentation to monitor how many db minimal work from the diagram shows sensitivity 25millivolt.
hello

8th Jul 2014, 11:39 am	#1
mimmo2010 Retired Dormant Member Join Date: Jul 2014 Location: Rome, Italy. Posts: 23	Repair Microwave Frequency Counter EIP535. hi, I'm new to the forum, I need help with the repair of the frequency 535B eip, the problem occurs on both band 1 and band 2 can not read fequenze above 85 MHz. Thank you

8th Jul 2014, 1:22 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: repair Microwave frequency eip535 Hello and welcome to the forums. I'm not familiar with this equipment and don't know what it is. You've posted this in both the Domestic Radio and Test Gear sections. Is it a radio or a piece of test equipment such as a signal generator or frequency counter. How old is it? Can you post some pictures? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

8th Jul 2014, 1:25 pm	#3
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: repair Microwave frequency eip535 I see from googling that it's a frequency counter. I've moved the thread to the correct section and given it a more informative title. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

8th Jul 2014, 1:32 pm	#4
mimmo2010 Retired Dormant Member Join Date: Jul 2014 Location: Rome, Italy. Posts: 23	Re: Repair Microwave Frequency Counter EIP535. OK, thanks

8th Jul 2014, 11:18 pm	#5
mimmo2010 Retired Dormant Member Join Date: Jul 2014 Location: Rome, Italy. Posts: 23	Re: Repair Microwave Frequency Counter EIP535. Hello everyone here is the circuit diagram is too large to attach. http://www.ko4bb.com/Manuals/EIP_Pha...ice_Manual.pdf

9th Jul 2014, 7:49 am	#6
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,478	Re: Repair Microwave Frequency Counter EIP535. Hi, Welcome to the forum. In order to better help you, can you tell us what test equipment you have available? Do you have any extenders for the plug-in cards? It ssems odd that the two channels stop at the same frequency. Are you sure the input signal is OK and not fading away at high frequencies. Otherwise it suggests you need to start looking around the circuitry common to both bands, i.e the pulse forming and digital counting circuits after the band selector switching. Is the display accurate below 85MHz? __________________ Regards, Richard, BVWS member

10th Jul 2014, 12:37 am	#7
mimmo2010 Retired Dormant Member Join Date: Jul 2014 Location: Rome, Italy. Posts: 23	Re: Repair Microwave Frequency Counter EIP535. hi, I'm checking in fact, I think that 's my oscillator modulated wrong, but I was misled by another frequency that worked for a hp5328a from 500mhz perhaps much more sensitive. Today I tried with a transmitter 432 mhz 5 watt and it works, and perhaps' a bit dull with lower powers. Thanks for your help

10th Jul 2014, 7:21 am	#8
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,478	Re: Repair Microwave Frequency Counter EIP535. 5W?? I hope you've got an attenuator in there somewhere or you'll blow input B. Then it will be really insensitive! Hope its not too late. Note from the spec. in the manual you posted: "damage level +27dbm" which is 0.5W. __________________ Regards, Richard, BVWS member

10th Jul 2014, 8:47 am	#9
mimmo2010 Retired Dormant Member Join Date: Jul 2014 Location: Rome, Italy. Posts: 23	Re: Repair Microwave Frequency Counter EIP535. I'm sorry you're right, but I used an antenna connected to the BNC input, I did not provide adequate instrumentation to monitor how many db minimal work from the diagram shows sensitivity 25millivolt. hello